Presto User manual

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(1)y p o. n o. C. i t. a u. v E. l a. Precast & Prestressed Concrete Beam Analysis and Design LEAP Software, Inc. P.O. Box 16827 Tampa, Florida 33687 www.leapsoft.com (800) 451-5327 toll-free (813) 985-9170 phone (813) 980-3642 fax. PRESTO ® LEAP Software, Inc. Copyright © 1980-2005 LEAP Software, Inc. All Rights Reserved..

(2) This software program has been developed for use by professional engineers. It is the user’s responsibility to ensure that the input for the software program is complete and correct, and that the results provided by the software program are interpreted correctly and conform to any design codes and government regulations that may apply.. y p o. Although this program has been written and tested by LEAP Software, Inc., no warranty, expressed or implied, is made as to the accuracy or functioning of the program or related program material. In no event will LEAP Software be liable for any damages for lost data or profits arising out of the use of or inability to use the licensed program.. C. The PRESTO® software is Copyright LEAP Software, Inc., 1993-2005. All rights reserved.. PRESTO® is licensed to the original licensee for use only on the terms set forth in the License and Confidentiality Agreement.. n o. PRESTO®. The user manual is Copyright LEAP Software, Inc., 1993-2005 All rights reserved. Unauthorized reproduction, display, modification, or distribution of this manual, or any portion of it, may result in severe civil and criminal penalties, and will be prosecuted to the full extent permitted by law.. i t. Trademarks. PRESTO® and the PRESTO® logo are registered in the U.S. Patent and Trademark Office and are registered trademarks of LEAP Software, Inc., 1993-2005. All rights reserved. LEAP and LEAP Software are registered trademarks of LEAP Software, Inc.. a u. Microsoft, MS-DOS, Windows, and the Microsoft logo are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.. l a. Tekla Structures is either registered trademarks or trademarks of Tekla Corporation.. v E. Version:. PRESTO® v8.6. Published by:. LEAP Software, Inc. Tampa, Florida Updated August 2005. Editor:. Pauline O’Brien. Contributing Authors:. Sri Kanneganti (Product Manager) Abdul Rauf, P.E. Tan Warraich.

(3) T A B L E OF C O N T E N T S. CHAPTER 1 INTRODUCTION..........................................................................................................IN-1 USING THE MANUAL ........................................................................................................................................................IN-1 TYPOGRAPHICAL CONVENTIONS...............................................................................................................................IN-2 PROGRAM CAPABILITIES ..................................................................................................................................................IN-3 DESIGN CODES .......................................................................................................................................................IN-3 MEMBER GEOMETRY ...............................................................................................................................................IN-3 LOAD TYPES ...........................................................................................................................................................IN-3 NON-PRESTRESSED REINFORCEMENT .....................................................................................................................IN-3 STRAND PATTERN OPTIONS ....................................................................................................................................IN-3 SECTION TYPES ......................................................................................................................................................IN-4 ANALYSIS AND DESIGN FEATURES ...........................................................................................................................IN-4 MISCELLANEOUS .....................................................................................................................................................IN-4 UNITS .............................................................................................................................................................................IN-5 PROGRAM INTERFACE .....................................................................................................................................................IN-5 USING ONLINE HELP .......................................................................................................................................................IN-6 USER MANUAL ................................................................................................................................................................IN-6. y p o. C. CHAPTER 2 GETTING STARTED ................................................................................................. GS-1 SYSTEM REQUIREMENTS ............................................................................................................................................... GS-1 LEAP SOFTWARE SECURITY ......................................................................................................................................... GS-1 TYPES OF LICENSES...................................................................................................................................................... GS-1 NETWORK SETUP .......................................................................................................................................................... GS-2 AUTHORIZATION WARNINGS........................................................................................................................................... GS-2 INSTALLING THE PROGRAM ............................................................................................................................................ GS-3 NOVELL INSTALLATION........................................................................................................................................... GS-6 INSTALLING AND CONFIGURING MICROSOFT .NET FRAMEWORK ..................................................................................... GS-7 MANAGING PRODUCT SITE KEYS ................................................................................................................................... GS-8 Authorizing a Program .................................................................................................................................... GS-8 Demo Authorization....................................................................................................................................... GS-10 Transferring Authorization............................................................................................................................. GS-11. n o. i t. a u. MULTIPLE FILE COPIES ............................................................................................................................................... GS-14 PROGRAM CRASH/TEMPORARY LOSS OF LICENSE........................................................................................................ GS-14 INSTALLATION OF COMPONENTS TO WORK FROM WITHIN TEKLA STRUCTURES.............................................................. GS-14 CONTACTING TECHNICAL SUPPORT ............................................................................................................................. GS-15. l a. CHAPTER 3 GENERAL OPERATION ...........................................................................................GO-1 STARTING PRESTO .....................................................................................................................................................GO-1 PRESTO TAB SCREENS ...............................................................................................................................................GO-1 PROJECT TAB ...............................................................................................................................................................GO-2 SWITCH DESIGN CODE DIALOG BOX ..............................................................................................................................GO-2 MEMBER INFO TAB ........................................................................................................................................................GO-3 Member Info Screen Terms ............................................................................................................................GO-3. v E. OPENING DATA DIALOG BOX .........................................................................................................................................GO-6 Opening Data Screen Terms ..........................................................................................................................GO-6 TORSION PARAMETERS DIALOG BOX .............................................................................................................................GO-7 Torsion Parameter Screen Terms...................................................................................................................GO-7. MATERIALS TAB ............................................................................................................................................................GO-8 Materials Screen Terms ..................................................................................................................................GO-8 LOADS TAB .................................................................................................................................................................GO-11 Loads Screen Terms.....................................................................................................................................GO-11. PRESTO®v8.6. Table of Contents / i. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(4) ANALYSIS TAB.............................................................................................................................................................GO-12 LOAD FACTORS DIALOG BOX .......................................................................................................................................GO-13 CHECK POINTS DIALOG BOX .......................................................................................................................................GO-15 DESIGN TAB................................................................................................................................................................GO-16 DESIGN PARAMETERS DIALOG BOX .............................................................................................................................GO-17 DESIGN OPTIONS TAB .........................................................................................................................................GO-17 Design Options Screen Terms ......................................................................................................................GO-18 PRESTRESS AND LOSSES TAB .............................................................................................................................GO-20 Prestress and Losses Screen Terms ............................................................................................................GO-21 DEFLECTION MULTIPLIER TAB ..............................................................................................................................GO-22 PHI FACTORS TAB ...............................................................................................................................................GO-23 MISCELLANEOUS DATA TAB .................................................................................................................................GO-23 Miscellaneous Data Screen Terms ...............................................................................................................GO-24 ALLOWABLE STRESS TAB ....................................................................................................................................GO-25 BEARING STEEL INFO DIALOG BOX ..............................................................................................................................GO-26 ......................................................................................................................................................................GO-26 Bearing Steel Info Screen Terms ..................................................................................................................GO-27. y p o. C. USER-DEFINED EFFECTIVE WIDTH OF TOPPING DIALOG BOX .......................................................................................GO-27 STRESS FACTORS DIALOG BOX ...................................................................................................................................GO-28 STRAND AND REBAR PATTERN DIALOG BOX ................................................................................................................GO-29 STRAND TAB .......................................................................................................................................................GO-30 Strand Tab Screen Terms.............................................................................................................................GO-34 LONGITUDINAL BARS TAB ....................................................................................................................................GO-39 Longitudinal Bars Screen Terms...................................................................................................................GO-40 OPTIONS TO SAVE, LOAD AND SAVE AS ...............................................................................................................GO-42 STEM STIRRUPS TAB ...........................................................................................................................................GO-43 Stem Stirrups Tab Screen Terms..................................................................................................................GO-44 STEM MESH TAB .................................................................................................................................................GO-45 Stem Mesh Tab Screen Terms .....................................................................................................................GO-45. n o. i t. a u. DESIGN RESULTS SCREEN ..........................................................................................................................................GO-46 DRAWING PRINT DIALOG BOX......................................................................................................................................GO-47 USING PRESTO FROM WITHIN TEKLA STRUCTURES....................................................................................................GO-48 PROGRAM MENU COMMANDS ......................................................................................................................................GO-54 FILE MENU..................................................................................................................................................................GO-54 FILE | NEW..........................................................................................................................................................GO-54 FILE | OPEN ........................................................................................................................................................GO-54 FILE | SAVE.........................................................................................................................................................GO-55 FILE | SAVE AS ...................................................................................................................................................GO-55 FILE MENU..................................................................................................................................................................GO-55 FILE | SAVE SETTING ...........................................................................................................................................GO-55 FILE | PRINT ........................................................................................................................................................GO-56 FILE | PRINT SETUP.............................................................................................................................................GO-57 FILE | SECURITY ..................................................................................................................................................GO-58 FILE | EXIT ..........................................................................................................................................................GO-58 SHOW MENU...............................................................................................................................................................GO-59 SHOW | IMAGE ...................................................................................................................................................GO-59 Image Button Summaries..............................................................................................................................GO-59 SHOW | MODEL ..................................................................................................................................................GO-60 SHOW | RESULTS ...............................................................................................................................................GO-60 SHOW | DIAGRAMS .............................................................................................................................................GO-61 SHOW | PREFERENCES ........................................................................................................................................GO-62. l a. v E. ii / Table of Contents ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO®v8.6.

(5) T A B L E OF C O N T E N T S. LIBRARIES MENU.........................................................................................................................................................GO-62 LIBRARIES | SETUP ..............................................................................................................................................GO-63 LIBRARIES | BEAM SECTIONS ...............................................................................................................................GO-63 Drawing the Beam Section............................................................................................................................GO-65 LIBRARIES | PRESTRESSING ................................................................................................................................GO-69 LIBRARIES | REBAR .............................................................................................................................................GO-70 LIBRARIES | CONVERT FROM V. 7.........................................................................................................................GO-71 HELP MENU ................................................................................................................................................................GO-72 HELP | CONTENTS ..............................................................................................................................................GO-72 HELP | USER MANUAL ........................................................................................................................................GO-72 HELP | SEARCH FOR HELP ON ............................................................................................................................GO-72 HELP | HOW TO USE HELP .................................................................................................................................GO-72 HELP | VISIT LEAP WEB SITE ............................................................................................................................GO-72 HELP | ABOUT PRESTO ....................................................................................................................................GO-72 HELP | TECH SUPPORT ......................................................................................................................................GO-72 HELP | CHECK FOR UPDATES .............................................................................................................................GO-72. y p o. C. CHAPTER 4 TUTORIAL SESSION ................................................................................................... T-1. TUTORIAL SESSION DESIGN OF A 8DT24 DOUBLE TEE ............................................................ T-3 PROBLEM DATA ............................................................................................................................................................... T-4 CONCRETE .............................................................................................................................................................. T-4 TOPPING .................................................................................................................................................................. T-4 THICKNESS .............................................................................................................................................................. T-5 STRAND ................................................................................................................................................................... T-5 OPENING DATA ........................................................................................................................................................ T-5 LOADS ..................................................................................................................................................................... T-5 STEP 1: START OF TUTORIAL ........................................................................................................................................... T-5 STEP 2: COMPLETE THE PROJECT INFORMATION ............................................................................................................... T-6 STEP 3: DEFINE THE MEMBER INFORMATION ..................................................................................................................... T-6 BEAM SECTIONS LIBRARY......................................................................................................................................... T-7 SECTION DETAIL DIALOG BOX .................................................................................................................................. T-7 TEMPLATE DIALOG BOX............................................................................................................................................ T-8 BEAM SECTIONS LIBRARY......................................................................................................................................... T-8 MEMBER INFO TAB ................................................................................................................................................... T-8 OPENING DATA DIALOG BOX .................................................................................................................................... T-9 IMAGE SCREEN ...................................................................................................................................................... T-10 STEP 4: DEFINE THE MATERIAL PROPERTIES .................................................................................................................. T-11 STEP 5: DEFINE THE LOADS ........................................................................................................................................... T-11 STEP 6: RUN THE ANALYSIS ........................................................................................................................................... T-12 LOAD FACTORS DIALOG BOX .................................................................................................................................. T-12 CHECK POINTS DIALOG BOX .................................................................................................................................. T-12 ANALYSIS TAB........................................................................................................................................................ T-13 STEP 7: DESIGN THE BEAM ............................................................................................................................................ T-14 DESIGN PARAMETERS DIALOG BOX ........................................................................................................................ T-14 STRAND AND REBAR PATTERN DIALOG BOX ........................................................................................................... T-15 STRAND TAB SCREEN ............................................................................................................................................ T-16 DESIGN RESULTS SCREEN ..................................................................................................................................... T-16 DIAGRAM SCREEN .................................................................................................................................................. T-17 STEP 9: GENERATE THE PROGRAM OUTPUT ................................................................................................................... T-18 OUTPUT ................................................................................................................................................................. T-19 OUTPUT T-19. n o. i t. a u. l a. v E. CHAPTER 5 THEORY ................................................................................................................... TH-1. PRESTO®v8.6. Table of Contents / iii. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(6) GENERAL OVERVIEW ..................................................................................................................................................... TH-1 LAYOUT ........................................................................................................................................................................ TH-2 TOPPING ....................................................................................................................................................................... TH-2 SECTION PROPERTIES ................................................................................................................................................... TH-4 PRESTRESS LOSSES ..................................................................................................................................................... TH-5 ANALYSIS...................................................................................................................................................................... TH-6 LOADS .......................................................................................................................................................................... TH-7 STRESSES – ACI 318-99 .............................................................................................................................................. TH-8 STRESSES – ACI 318-05 .............................................................................................................................................. TH-8 STRESSES – CSA 23.3-94.......................................................................................................................................... TH-10 CRACK CONTROL – ACI 318-99/05............................................................................................................................. TH-10 CRACK CONTROL – CSA 23.3-94 AND ACI 318-95 ..................................................................................................... TH-11 ULTIMATE STRENGTH – ACI 318-99/05 ...................................................................................................................... TH-11 ULTIMATE STRENGTH – CSA 23.3-94 ......................................................................................................................... TH-12 PRESTRESSING STRAND – STRESS-STRAIN CURVES .................................................................................................... TH-14 DESIGN METHODOLOGY – ACI 318-99 ........................................................................................................................ TH-16 DESIGN METHODOLOGY – ACI 318-05 ........................................................................................................................ TH-18 SHEAR – ACI 318-99/05............................................................................................................................................. TH-19 TORSION – ACI 318-99/05 ......................................................................................................................................... TH-20 SHEAR AND TORSION - PCI DESIGN HANDBOOK, 6TH EDITION ..................................................................................... TH-21 SHEAR AND TORSION – CSA 23.3-94 ......................................................................................................................... TH-21 CAMBER AND DEFLECTIONS......................................................................................................................................... TH-22 DEVELOPMENT LENGTH ............................................................................................................................................... TH-25 LIGHTWEIGHT CONCRETE ............................................................................................................................................ TH-26 REDUCTION FACTORS ................................................................................................................................................. TH-26 BEARING ANALYSIS ..................................................................................................................................................... TH-27. y p o. n o. C. i t. a u. CHAPTER 1 NOMENCLATURE AND PRINTOUT EXPLANATION .............................................. A1-1 LABELS USED THROUGHOUT THE PRINTOUT ...................................................................................................................A1-1 PROJECT DATA ..............................................................................................................................................................A1-2 TOPPING DATA...............................................................................................................................................................A1-3 PRESTRESSED STRAND DATA .........................................................................................................................................A1-3 PRESTRESSED STRAND PATTERN DATA ..........................................................................................................................A1-3 STRAND GROUPS, SHIELDING AND PULL DATA ................................................................................................................A1-3 REBAR DATA .................................................................................................................................................................A1-3 REBAR PATTERN DATA...................................................................................................................................................A1-3 STIRRUPS ......................................................................................................................................................................A1-3 BEARING STEEL DATA ....................................................................................................................................................A1-4 CALCULATED INTERNAL CONSTANTS ...............................................................................................................................A1-4 STEM MESH DATA..........................................................................................................................................................A1-4 UNREINFORCED SECTION PROPERTY ZONE DATA ...........................................................................................................A1-4 THIS SECTION PRINTS ONLY IN ACI 318-05 MODE .........................................................................................................A1-4 STRUCTURAL ANALYSIS ..................................................................................................................................................A1-5 PRESTRESS LOSS COMPUTATIONS .................................................................................................................................A1-5 BEARING STEEL .............................................................................................................................................................A1-6 RELEASE AND FINAL STRESSES ......................................................................................................................................A1-6 ULTIMATE STRENGTH .....................................................................................................................................................A1-6. l a. v E. iv / Table of Contents ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO®v8.6.

(7) T A B L E OF C O N T E N T S. CRACK CONTROL ........................................................................................................................................................... A1-7 CRACKING LOAD ............................................................................................................................................................ A1-7 VERTICAL SHEAR AND TORSION ..................................................................................................................................... A1-7 HORIZONTAL SHEAR....................................................................................................................................................... A1-8 CAMBER AND DEFLECTIONS ........................................................................................................................................... A1-9. y p o. CHAPTER 2 HAND CALCULATIONS FOR SELECTED ITEMS....................................................A2-1 MEMBER SECTION - PRECAST ................................................................................................................................ A2-1 Section Properties............................................................................................................................................ A2-1 HAND CALCULATIONS FOR SELECTED ITEMS ................................................................................................................... A2-1 Zone 2 .............................................................................................................................................................. A2-2 Zone 4 .............................................................................................................................................................. A2-2 MEMBER SECTION - COMPOSITE ............................................................................................................................. A2-3 Zones 1, 3 and 5 .............................................................................................................................................. A2-3 Zones 2 and 4 .................................................................................................................................................. A2-3 PRECAST DATA ...................................................................................................................................................... A2-3 Allowable Concrete Stresses ........................................................................................................................... A2-4 Release ............................................................................................................................................................ A2-4 Final Conditions ............................................................................................................................................... A2-4 CONCRETE DATA ................................................................................................................................................... A2-5 PRESTRESSED STRAND .......................................................................................................................................... A2-5 UNREINFORCED SECTION PROPERTIES ................................................................................................................... A2-6 REINFORCED SECTION PROPERTY DATA ................................................................................................................. A2-6 Analysis............................................................................................................................................................ A2-6 Self-weight ....................................................................................................................................................... A2-7 Topping ............................................................................................................................................................ A2-7 Superimposed Dead Load on Composite (SD)................................................................................................ A2-8 Live Loads (LL) ................................................................................................................................................ A2-8 Total Moment and Shears At Final Conditions................................................................................................. A2-8 PRESTRESS LOSSES .............................................................................................................................................. A2-9 PRECAST AND COMPOSITE SECTION PROPERTIES ................................................................................................. A2-11 Miscellaneous Section Properties Computations........................................................................................... A2-11 CALCULATION OF MEMBER STRESSES .................................................................................................................. A2-12 Release Stresses: Precast Section Only ....................................................................................................... A2-12 Final Stresses: Precast Section Only............................................................................................................. A2-13 STRAND DEVELOPMENT........................................................................................................................................ A2-15 ULTIMATE STRENGTH ........................................................................................................................................... A2-15 CRACKING LOAD .................................................................................................................................................. A2-17 VERTICAL SHEAR ................................................................................................................................................. A2-17 HORIZONTAL SHEAR ............................................................................................................................................. A2-20. n o. C. i t. a u. l a. v E. CHAPTER 3 HAND CALCULATIONS FOR TORSION ..................................................................A3-1 HAND CALCULATIONS FOR TORSION ............................................................................................................................... A3-1 MATERIALS ............................................................................................................................................................ A3-2 LOADS ................................................................................................................................................................... A3-2 CRITICAL SECTION ................................................................................................................................................. A3-2 ANALYSIS RESULTS ................................................................................................................................................ A3-2 PRESTRESSING ...................................................................................................................................................... A3-3 COMPOSITE SECTION PROPERTIES ......................................................................................................................... A3-3 STRESSES ............................................................................................................................................................. A3-4 CRACKING MOMENT ............................................................................................................................................... A3-4 SHEAR DESIGN ...................................................................................................................................................... A3-4. PRESTO®v8.6. Table of Contents / v. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(8) TORSION DESIGN ...................................................................................................................................................A3-5 Cracking Torsional Moment .............................................................................................................................A3-6 Check for Minimum Transverse Steel ..............................................................................................................A3-7 CHECK FOR SPACING .............................................................................................................................................A3-7 Spacing for Shear ............................................................................................................................................A3-7 Spacing for Torsion ..........................................................................................................................................A3-7 LONGITUDINAL STEEL .............................................................................................................................................A3-7 Compression in Concrete.................................................................................................................................A3-8. y p o. CHAPTER 4 STRAND AND REBAR PROPERTIES ...................................................................... A4-1 STRAND AND REBAR PROPERTIES ..................................................................................................................................A4-1 CHAPTER 5 SECTION TYPE AND DIMENSIONS......................................................................... A5-1 SECTION TYPE AND DIMENSIONS ....................................................................................................................................A5-1 CHAPTER 6 REFERENCES ........................................................................................................... A6-1 REFERENCES .................................................................................................................................................................A6-1. C. CHAPTER 7 GLOSSARY................................................................................................................ A7-1 GLOSSARY .....................................................................................................................................................................A7-1. n o. INDEX ........................................................................................................................................INDEX-1. i t. a u. l a. v E. vi / Table of Contents ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO®v8.6.

(9) L I S T OF F I G U R E S. FIGURE IN-1. FIGURE GS-1. FIGURE GS-2. FIGURE GS-3. FIGURE GS-4. FIGURE GS-5. FIGURE GS-6. FIGURE GS-7. FIGURE GS-8. FIGURE GS-9. FIGURE GS-10. FIGURE GS-11. FIGURE GS-12. FIGURE GS-13.. PRESTO Online Help Screen ...................................................................................................................IN-6 Welcome Screen..................................................................................................................................... GS-3 Choose Destination Location .................................................................................................................. GS-4 Security Directory.................................................................................................................................... GS-4 Using PRESTO From Within Tekla Structures Option............................................................................. GS-5 Ready to Install the Program................................................................................................................... GS-5 Authorize Now? Dialog............................................................................................................................ GS-6 Installation Complete.............................................................................................................................. GS-6 .Net Framework v1.1 Wizard................................................................................................................... GS-7 Security Adjustment Wizard .................................................................................................................... GS-8 LEAP Software Security Screen ............................................................................................................. GS-9 Client Licenses Screen ........................................................................................................................... GS-9 Created Site Key Screen....................................................................................................................... GS-10 Security Window Authorization Tab....................................................................................................... GS-10. y p o. C. LEAP Software Security Screen – Direct Transfer Tab....................................GS-11 FIGURE GS-15. LEAP Software Security Screen – Register Transfer Tab ........................................................ GS-12 FIGURE GS-14.. n o. FIGURE GO-1. PRESTO Splash Screen .........................................................................................................................GO-1 FIGURE GO-2. Project Tab ..............................................................................................................................................GO-2 FIGURE GO-3. Switch Design Code Dialog Box .............................................................................................................GO-3 FIGURE GO-4. Member Info Tab .....................................................................................................................................GO-3 FIGURE GO-5. Gap Topping Adjustment.........................................................................................................................GO-5 FIGURE GO-6. Opening Data Dialog Box........................................................................................................................GO-6 FIGURE GO-7. Torsion Parameters Dialog Box...............................................................................................................GO-7 FIGURE GO-8. Materials Tab...........................................................................................................................................GO-8 FIGURE GO-9. Loads Tab.............................................................................................................................................. GO-11 FIGURE GO-10. Analysis Tab ..........................................................................................................................................GO-13 FIGURE GO-11. Load Factors Dialog Box.......................................................................................................................GO-14 FIGURE GO-12. Check Points Dialog Box.......................................................................................................................GO-15 FIGURE GO-13. Auto Generate Check Points Dialog Box ..............................................................................................GO-16 FIGURE GO-14. Design Tab ............................................................................................................................................GO-17 FIGURE GO-15. Design Options Tab in ACI 318-05 Mode..............................................................................................GO-18 FIGURE GO-16. Design Options Tab in CSA 23.3-94 Mode .........................................................................................GO-18 FIGURE GO-17. Bearing Analysis ...................................................................................................................................GO-19 FIGURE GO-18. Prestress and Losses Tab.....................................................................................................................GO-21 FIGURE GO-19. Deflection Multiplier Tab ........................................................................................................................GO-22 FIGURE GO-20. Phi Factors Tab .....................................................................................................................................GO-23 FIGURE GO-21. Miscellaneous Data Tab ........................................................................................................................GO-24 FIGURE GO-22. Allowable Stress Tab (ACI 318-99 and CSA 23.3-94) ........................................................................GO-25 FIGURE GO-23. Allowable Stress Tab (ACI 318-05) .......................................................................................................GO-26 FIGURE GO-24. Bearing Steel Info Dialog Box ...............................................................................................................GO-26 FIGURE GO-25. User Defined Effective Width of Topping Dialog Box ............................................................................GO-28 FIGURE GO-26. Stress Factors Dialog Box (ACI 318-99) ...............................................................................................GO-28 FIGURE GO-27. Stress Factors Dialog Box (ACI 318-05) ...............................................................................................GO-29. i t. a u. l a. v E PRESTO®v8.6. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. List of Figures / 1.

(10) FIGURE GO-28. Stress Factors Dialog Box (CSA 23.3-94)...........................................................................................GO-29 FIGURE GO-29. Strand Tab Showing Live Graphics .......................................................................................................GO-30 FIGURE GO-30. Strand Tab Showing Template Definitions.............................................................................................GO-31 FIGURE GO-31. Strand Tab for Double Tee Showing Live Graphics...............................................................................GO-32 FIGURE GO-32. Strand Tab for Double Tee Showing Template Definitions ....................................................................GO-32 FIGURE GO-33. Strand and Rebar Screen Grid Menu....................................................................................................GO-34 FIGURE GO-34. One Point ..............................................................................................................................................GO-35 FIGURE GO-35. One Point Fixed.....................................................................................................................................GO-35 FIGURE GO-36. Two Point Variable.................................................................................................................................GO-36 FIGURE GO-37. Zero Point (Straight) ..............................................................................................................................GO-36 FIGURE GO-38. Left and Right Debond ..........................................................................................................................GO-37 FIGURE GO-39. Mid Debond ...........................................................................................................................................GO-38 FIGURE GO-40. Longitudinal Bars (For Sections Other Than Double Tee).....................................................................GO-39 FIGURE GO-41. Longitudinal Bars (For Double Tee Sections)........................................................................................GO-40 FIGURE GO-42. Two Point Variable Display....................................................................................................................GO-41 FIGURE GO-43. Save Components dialog ......................................................................................................................GO-42 FIGURE GO-44. Stem Stirrups (Shear Reinforcement) ...................................................................................................GO-43 FIGURE GO-45. Design Stirrups Form ............................................................................................................................GO-44 FIGURE GO-46. Stem Mesh Tab .....................................................................................................................................GO-45 FIGURE GO-47. Design Results Screen..........................................................................................................................GO-46 FIGURE GO-48. Enhanced Report View..........................................................................................................................GO-47 FIGURE GO-49. Drawing Print Dialog Box ......................................................................................................................GO-47 FIGURE GO-50. Sample Output Showing C/S.................................................................................................................GO-48 FIGURE GO-51. Tekla Structures with Beam Plug-in Icons .............................................................................................GO-49 FIGURE GO-52. Tekla Structures with PRESTO Plug-in Icon .........................................................................................GO-50 FIGURE GO-53. Member Info Tab when PRESTO is Called from Tekla Structures ........................................................GO-50 FIGURE GO-54. Double Tee Beam Information Passed from Tekla Structures...............................................................GO-51 FIGURE GO-55. Section Details for the Section Passed from Tekla Structures ..............................................................GO-52 FIGURE GO-56. Strand and Rebar Tab for Double Tee Section......................................................................................GO-53 FIGURE GO-57. Update Strand/Rebar Pattern for Beam in Tekla Structures..................................................................GO-53 FIGURE GO-58. File | New ..............................................................................................................................................GO-54 FIGURE GO-59. File | Open.............................................................................................................................................GO-54 FIGURE GO-60. File | Save As ........................................................................................................................................GO-55 FIGURE GO-61. File | Print ..............................................................................................................................................GO-56 FIGURE GO-62. File | Print Setup....................................................................................................................................GO-57 FIGURE GO-63. File | Security.........................................................................................................................................GO-58 FIGURE GO-64. Show | Image ........................................................................................................................................GO-59 FIGURE GO-65. Show | Model.........................................................................................................................................GO-60 FIGURE GO-66. Show | Results ......................................................................................................................................GO-61 FIGURE GO-67. Show | Diagram.....................................................................................................................................GO-61 FIGURE GO-68. Show | Preferences ...............................................................................................................................GO-62 FIGURE GO-69. Libraries | Setup ....................................................................................................................................GO-63 FIGURE GO-70. Libraries | Beam Sections .....................................................................................................................GO-63. y p o. n o. C. i t. a u. l a. v E. 2 / List of Figures ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO® v8.6.

(11) FIGURE GO-71. Section Detail Dialog Box (Double Tee) ................................................................................................GO-64 FIGURE GO-72. Section Drawing Screen........................................................................................................................GO-65 FIGURE GO-73. Drawing Properties Dialog Box .............................................................................................................GO-67 FIGURE GO-74. Circular Section Dialog Box ..................................................................................................................GO-68 FIGURE GO-75. Template Dialog Box .............................................................................................................................GO-68 FIGURE GO-76. Template Auto Generation Dialog Box ..................................................................................................GO-69 FIGURE GO-77. Libraries | Prestressing..........................................................................................................................GO-70 FIGURE GO-78. Libraries | Rebar....................................................................................................................................GO-71 FIGURE GO-79. Libraries | Convert from v.7 ...................................................................................................................GO-71 FIGURE T-1. Strand Pattern ............................................................................................................................................ T-4 FIGURE T-2. PRESTO Splash Screen ............................................................................................................................ T-5 FIGURE T-3. Project Tab ................................................................................................................................................. T-6 FIGURE T-4. Member Info Tab ........................................................................................................................................ T-6 FIGURE T-5. Beam Sections Library ............................................................................................................................... T-7 FIGURE T-6. Section Detail Dialog Box (Double Tee) ..................................................................................................... T-7 FIGURE T-7. Template Dialog Box .................................................................................................................................. T-8 FIGURE T-8. Beam Sections Library (Showing New Section 8DT24)............................................................................. T-8 FIGURE T-9. Member Info Tab ........................................................................................................................................ T-9 FIGURE T-10. Opening Data Dialog Box........................................................................................................................... T-9 FIGURE T-11. Show | Image ........................................................................................................................................... T-10 FIGURE T-12. Materials Tab.............................................................................................................................................T-11 FIGURE T-13. Loads Tab..................................................................................................................................................T-11 FIGURE T-14. Load Factors Dialog Box.......................................................................................................................... T-12 FIGURE T-15. Check Points Dialog Box.......................................................................................................................... T-13 FIGURE T-16. Analysis Tab ............................................................................................................................................. T-13 FIGURE T-17. Design Tab ............................................................................................................................................... T-14 FIGURE T-18. Design Parameters Dialog Box ................................................................................................................ T-15 FIGURE T-19. Strand and Rebar Pattern (with Template Definitions) Dialog Box.......................................................... T-15 FIGURE T-20. Strand Tab................................................................................................................................................ T-16 FIGURE T-21. Design Results Screen............................................................................................................................. T-17 FIGURE T-22. Diagram Screen ....................................................................................................................................... T-17 FIGURE TH-1. User Specified Left/Right Boundary Distances ........................................................................................TH-3 FIGURE TH-2. Stress-Strain Curves per PCI Design Handbook 5th Edition .................................................................TH-14 FIGURE TH-3. Stress-Strain Cures for Prestressing Strand ..........................................................................................TH-14 FIGURE TH-4. PRESTO 8.2 and Older Methodology ....................................................................................................TH-15 FIGURE TH-5. Stress-Strain Cures for Prestressing Strand Elasticity...........................................................................TH-15 FIGURE TH-6. Variation of f with c/dt .............................................................................................................................TH-19 FIGURE TH-7. Development Curve of Prestressed Strands..........................................................................................TH-26 FIGURE A2-1. Precast Section ........................................................................................................................................ A2-1 FIGURE A2-2. Composite Section ................................................................................................................................... A2-3 FIGURE A2-3. Strand Profile ........................................................................................................................................... A2-5 FIGURE A2-4. Beam Loading .......................................................................................................................................... A2-6 FIGURE A2-5. Strain Diagram for Ultimate Strength ..................................................................................................... A2-15. y p o. n o. C. i t. a u. l a. v E. PRESTOR®v8.6. List of Figures / 3. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(12) FIGURE A3-1. FIGURE A3-2. FIGURE A3-3.. Shear and Torsion Design of an L Beam on 30 Ft. Span .........................................................................A3-1 Shear and Torsion Design of an L Beam..................................................................................................A3-2 Shear and Torsion Design of an L Beam (Closed Stirrup) .......................................................................A3-6. y p o. n o. C. i t. a u. l a. v E. 4 / List of Figures ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO® v8.6.

(13) CHAPTER ONE. Introduction. y p o. C. PRESTO is a comprehensive computer program for the design and analysis of. precast, prestressed concrete beams in accordance with ACI specifications. Version 8.6 provides features to design a beam based on either ACI 318-99 or ACI 318-05, or CSA 23.3-94 with updates of 2001. It is designed to be as userfriendly as possible so that professional engineers with minimal computer experience may operate it with ease.. n o. i t. Using the Manual. The intent of the PRESTO user manual is to help you become familiar with the program and its capabilities. We recommend first reading the General Operation chapter to get an overview of the program’s intended functionality and operational procedures. Review the Theory chapter for an in-depth description of the program’s technical material. The nomenclature in the Appendix describes the definitions of terms used in PRESTO.. a u. l a. v E. Table of Contents The Table of Contents lists the overall layout and topics of the. PRESTO user manual. It is advised when trying to find a particular topic in the manual, to scan through the Table of Contents. Introduction This chapter contains information that is helpful to know before attempting to use PRESTO, such as program capabilities, intended use, and key features. It also includes helpful information about using the manual. Reviewing this material prior to running the program helps to ensure smooth operation. Getting Started This chapter contains information relating to program installation, authorization, and network setup. It also includes how to transfer authorization and how to contact technical support. You should read this chapter completely before installing and running the program. General Operation The General Operation chapter includes information about each of the different input fields, main tabs, and screens in PRESTO. You can also find related information in the online help system. You can activate the context-sensitive online help at any time while running the program by pressing the F1 key on your keyboard.. PRESTO®v8.6 ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. IN-1.

(14) Using the Manual. The best way to become acquainted with the program is by actually using it to solve a few problems. In the Tutorials chapter, we walk you through a typical problem from start to finish and illustrate how PRESTO operates. We encourage you to run the tutorial on your own computer and compare monitor displays with the illustrations in this manual. By closely following these tutorials, you can quickly become familiar with a typical design situation and most of the computer data input/output process.. Tutorials. y p o. Theory. Appendices. n o. C. i t. Index. a u. Typographical Conventions. We have tried to make PRESTO as user-friendly as possible; however, there are some features that cannot be made apparent by a headlong approach to using the software. The extra time it takes to go through the tutorial will be compensated for by the knowledge gained. It is advisable for you to check several previous designs using PRESTO. This will serve to confirm your knowledge of the operation and assumptions of this program. This chapter contains details on the assumptions and methods used in PRESTO. Most in-depth technical questions can be answered by referring to this chapter. These chapters contain the nomenclature, and printout explanation, hand calculations, strand and rebar properties, section types and dimensions, a list of cited references used in the manual, and glossary. The Index contains a cross-reference of entries from the manual. Many times, information about a particular item is given from different points of view in other sections of the manual. Therefore, if you have a question regarding a particular item, it can be very helpful to refer to each entry listed under that item in the Index.. For your convenience, many of the commonly used terms and references throughout the manual appear in special styles. The following are examples of these typographical conventions that allow you to easily recognize key information.. l a. v E. Button References. Add. Keyboard References. SHIFT+TAB. Option and Icon References. Option. Pull-down menus, Drop-down lists, Lists, Check Boxes, Columns, Field References. Beam ID drop-down list. Screens, Dialog Boxes, Tabs, Libraries. System Information screen. Article/Equation References. ACI Art. 9.20.2.4. Note: Unless stated otherwise, references to “Art.” refer to an article number of the ACI 318 code(s).. IN-2 / Introduction ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO® v8.6.

(15) Program Capabilities. Program Capabilities PRESTO is a state-of-the-art design tool that has evolved from years of field use. It. provides practical features and functions that allow you to minimize your design time while maximizing your accuracy. PRESTO provides complete precast beam design with more features and options than any comparable product. The following list highlights some of PRESTO’s main features:. y p o. Design Codes •. ACI 318-05. •. ACI 318-99. •. CSA 23.3-94 (with updates of 2001). •. Ability to design simple-spans with unequal cantilevers.. •. Ability to place rectangular or circular flange openings anywhere along the member.. •. Differentiate topping width over members and between members separately.. •. Vary topping thickness along members.. •. Ability to place dead loads on composite or non-composite sections.. Member Geometry. i t. Load Types. a u. •. Apply live loads, i.e., point loads, partial uniform loads, partially distributed trapezoidal loads.. Non-Prestressed Reinforcement •. Ability to place rebar in topping or in precast.. •. Designate straight, hooked, or mechanically anchored ends on rebar.. l a •. v E. n o. C. Specify stirrup reinforcement. •. Specify stem mesh reinforcement. •. Easy-to-use graphical strand pattern input screen.. •. Ability to select regular, stress-relieved, or low-relaxation strands.. •. Create different strand patterns at left end, right end, and at depression point.. •. Ability to shield (debond) straight patterns.. •. Automatic strand pattern generation.. •. Automatic shielding of strands.. •. Specify fractional strands. Strand Pattern Options. PRESTO®v8.6. Introduction / IN-3. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(16) Program Capabilities. Section Types •. Design all major section types, i.e., Double Tees, Single Tees, Hollow core slabs, Solid flat slabs, Inverted T-beams, L-beams, Rectangular beams, and Keystone joists.. •. Graphical input for sections using the Drawing Editor.. y p o. Analysis and Design Features •. Compute section properties (composite and non-composite) automatically at openings and at changes in topping thickness.. •. Ability to select computer-generated or user-specified prestress losses.. •. View complete stress histories at release and at final conditions with different support locations at release and final conditions.. •. Perform comprehensive ultimate strength computations.. •. Perform combined vertical shear, torsion, and horizontal shear computations.. •. Analyze conventional or bilinear deflection.. •. Ability to work from within Tekla Structures to design/check members.. •. Ability to export beam drawing to AutoCAD/Microstation.. •. Ability to export analysis results to spreadsheets.. •. Work with U.S. units or Metric units.. n o. Miscellaneous. C. a u. i t. l a. v E. IN-4 / Introduction ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO® v8.6.

(17) Units. Units PRESTO works with either U.S. or Metric (SI) units. Following is a list of units and. the conversion between both systems. English. Metric. Conversion Factor*. ft. m. 0.3048. in. mm. 25.4. 2. in /ft. mm /m. 2116.6667. in2. mm2. 645.16. in4. mm4*106. 0.41623. 2. k. kN. 4.44822. k-ft. kN-m. 1.35582. klf. kN/m. 14.5939. ksi. MPa. 6.89476. psi. kPa. n o. pcf. kg/m. plf psf. i t. * For example, 1 ft = 0.3048 m. 3. y p o. C. 6.89476. 16.0185. N/m. 14.4939. Pa. 47.8803. NOTE: Although you can switch between U.S. and metric units at any time during program execution, some round-off errors may be introduced due to the fact that for converting between both systems of units, the program uses only the number of decimals that are shown on the screen.. a u. Program Interface. l a. PRESTO uses the Microsoft Windows interface elements such as tabbed dialog boxes,. pull-down menus, buttons, scroll bars, etc. This interface is very intuitive; it eliminates the need to memorize keystrokes or commands.. v E PRESTO®v8.6. Introduction / IN-5. ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher..

(18) Using Online Help. Using Online Help This program uses the Microsoft Windows online help interface. To access PRESTO Online Help, select the Contents option from the Help menu or click the Help icon on the Toolbar.. y p o. n o. C. i t. a u. FIGURE IN-1. PRESTO Online Help Screen. While running the program, you may access context-sensitive help information by pressing the F1 key on your keyboard. To exit the Help window, click the X located in the top right corner of the screen. For example, if you are having difficulty using a particular screen or dialog box, pressing the F1 key opens the help topic associated with that screen.. l a. v E. User Manual. The entire user manual is available as a PDF document from within the program. To access this manual, select the User Manual option from the Help menu, or click the User Manual icon on the toolbar.. IN-6 / Introduction ©LEAP Software, Inc. No part of this user manual may be reproduced in any form or by any means without the written permission of the publisher.. PRESTO® v8.6.

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