Staad Pro- An Overview

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E4

E4--E5 CIVIL

E5 CIVIL

(TECHNICAL)

STAAD PRO

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WELCOME

• This is a presentation for the E4-E5 Civil Technical Module for the Topic: STAAD PRO – An Overview

• Eligibility: Those officers of civil wing who have got the Up-gradation from E4 to E5.

• This presentation is last updated on 21-4-2011.

• You can also visit the Digital library of BSNL to see this topic.

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AGENDA

Introduction

Features of STAAD PRO

Types of structures & Elements

Axis & Sign Convention in STAAD PRO

Steps of Design using STAAD PRO

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INTRODUCTION

Use of Computers in Structural Design of Buildings

• Computers can perform lengthy & tedious computations at a very high-speed therefore computer programs are used for analysis & design of structural members.

• Computer results are dependent on effectiveness of software as certain assumptions are made in the development of programs.

• But with experience & regular revision & updating, these computer programs can be relied upon to give accurate results.

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INTRODUCTION

• Limitations of Hand Computation Methods

– Applicable for small problems

– Tedious for even medium sized problems

– 3-d analysis almost impossible

• Advantages of Computer Analysis

– Matrix methods of structural analysis

– Development of numerical techniques

– Finite element method

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STAAD PRO

Use of Computers in Structural Design of Buildings

• STAAD PRO is a very powerful software which can

be used fro 3-D analysis &

is useful for analysis and

design of multi-storied buildings.

• Full range of analysis including static, P-delta,

response spectrum, time history, cable etc. and

• Steel design ,

• Concrete design and

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STAAD PRO

It provides the user environment for –

• Model development (Graphical as well as input

editor)

• Model visualization on screen,

• Analysis & design, and

• Verification

• Pre and Post Processor

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Features of STAAD PRO

• Object-oriented 2D/3D graphical model generation

with Flexible zoom, pan and multiple views.

• Built-in command file editor for text edit.

• Customizable structural templates for creating a

model.

• Unlimited Undo and Redo

• Pull down menus, floating tool bars, tool tip help &

quick data input through spreadsheets.

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Features of STAAD PRO

• Supports truss & beam members, plates, solids, linear

and non-linear cables & curvilinear beams.

• Advanced automatic load generation facilities for

area, floor & moving loads.

• Display

of

loads,

supports,

properties,

joints,

members, etc

Rectangular and also cylindrical & reverse cylindrical

coordinate systems with mix and match capabilities

.

c

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Features of STAAD PRO

• Easy auto mesh & auto refinement of user-defined polygonal element boundary by simple mouse clicks, including openings & column/ wall lines.

• Joint, member/ element, mesh generation with flexible user-controlled numbering scheme

• Import/ Export DSF, DWG and Excel files.

• Presentation quality printer plots of geometry and results as part of run output.

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Features of STAAD PRO

Model Generation

Easy “snap-to” construction grid for laying out beams and columns on irregular grids.

Segments of repetitive geometry may be used to generate complex structural models.

Generate, copy, repeat, mirror, pivot, etc. for quick and easy geometry generation.

Comprehensive graphical editing.

Library of commonly used structures and display of properties, loadings, supports, orientations etc.

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Features of STAAD PRO

Model Generation

Graphical specification & display of properties, loadings, supports, orientations etc.

Import/Export of Auto Cad 2D/3D files to start model. Access to text editor to modify model quickly through

command syntax.

User-controlled scale factors for deflected shapes. Customizable node/member & renumbering scheme.

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Analysis & Design

• Static Analysis – Primary – P-delta – Non-linear – Non-Linear Cable • Basic Design – Steel – Concrete • Dynamic analysis – Rayleigh – Eigen Solution – Time History – Response Spectrum • Special Design – Aluminum – Timber – Transmission Tower

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Structure Types

Structural Types:

d d d d d d d u d d u u u d u u GX GY GZ d X Z TRUSS (2D) TRUSS (3D)

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Element Types

• Structural Elements • Line • Truss • Beam • Surface • Plate/ Shell • Surface • Solid d d d d u u u u d u u d d d d d

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Boundary Condition

• Fully Restrained • Partially restrained w/ Springs • Inclined • Multilinear • Partially Restrained

Some Special Supports – • Elastic footing

• Elastic Mat

• Multi-linear Spring • Inclined Support

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Using STAAD PRO

Using STAAD PRO for Analysis & Design of Building – Steps In Design

• Manual design of slabs, staircases, chajjas, lintels etc.

• Preparing structural model of building

• Preparing data for STAAD PRO program at all levels

i.e load intensities at all floors & wall load etc.

• Perform Analysis after complete feeding of data and

obtain the analysis out-put.

• Once

analysis

is

completed

for

different

load

combination design is performed for load envelope.

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Using STAAD PRO

Using STAAD PRO for Analysis & Design of Building

– Steps In Design

• STAAD PRO gives beam and column designs at all levels & column reactions for design of foundations.

• Manual design of footings.

• After design by STAADPRO we note down area of steel for column at various levels & grouping is done.

• For beams we note down main reinforcement & Shear reinforcement at various sections & do detailing.

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Steps for Static Analysis

• Geometric Modeling

• Material Properties

• Sectional Properties

• Supports : Boundary Conditions

• Loads & Load combinations

• Special Commands

• Analysis Specification

• Design Command

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Geometric Modeling

• Nodal Co-ordinate Data

• Selection of Elements : Element Library

• Beam Elements : Beams, Columns, Truss Members • Plate Elements : Structural Walls, Floor Slabs

• Plane Stress Elements : Shear Walls, Floor Slabs Acting As Rigid Diaphragm To Lateral Loading

• Solid Elements : Thick Raft, Block Foundations

Surface Element:

– Rectangular

– Default Division 10X10, no. can be controlled

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Sectional & Material Properties

• Beam Elements : Cross Section • Plate Elements : Thickness

• Solid Elements : NIL

• Material means a set of: – Modulus of Elasticity – Poisson’s Ratio – Weight Density – Thermal Coefficient – Damping Ratio – Shear Modulus • Geometric Constant – Beta ( ) Angle – Reference Point

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Axis & Sign Convention

• Local & Global Axis System for Member – Depends on Connectivity

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Axis & Sign Convention

•Different Axis Systems for Member Loads (Global-Y is Vertical)

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Axis & Sign Convention

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Axis & Sign Convention

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Loads

Self Weight Joint Loads

– Concentrated Load & Moments – Support Displacement Loads

Member Loads

– Uniform Force & Moment (Full / Partial) (d1, d2, d3) – Concentrated Force & Moment (d1, d2)

– Floor Load & Area Load (new GX, GZ Floor Load) – Linear Varying & Trapezoidal Load

– Pre-Stress / Post-Stress Load – Hydrostatic Trapezoidal Load – Temperature Load (x, y, z)

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Loads

Plate Element Loads

Pressure (Full / Partial) Concentrated Force (x, y) Trapezoidal & Hydrostatic Trapezoidal Load

Surface Element Pressure Generated Loads

Wind Load

Seismic Co-efficient Method Repetitive Moving Load

Dynamic Loads Time History Response Spectrum Combined Effect of Loads Combination (Algebraic, SRSS, ABS) Repeat Load

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Codes & Shapes

• Design Codes

– IS 800 for Steel design

– IS 456 & 1893 for RCC design

• Shapes supported

– Shapes include I-Beams with or without cover plates,

channels, angles, double angles/ channels, pipes

and tubes (HSS Sections) for Steel design

– Also built-in steel tables

– Design of

circular, rectangular, I and L shaped,

trapezoidal and Tee sections for RCC design.

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Earthquake Analysis

• IS 1893 – 2002 (Part 1) Parameters:

– Seismic Zone Coefficient – Response Reduction Factor – Importance Factor

– Soil Site Factor – Type of Structure

– Damping Ratio (obtain Multiplication Factor for Sa/g) – Depth of Foundation below Ground Level

• Reduction of A_h due to Depth of Foundation

• Acceleration as Function of Time Period and Soil Type • Evaluation of Base Shear

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Typical Command Sequence

STAAD SPACE UNIT METER KN JOINT COORDINATES MEMBER INCIDENCES MATERIAL CONSTANTS MEMBER PROPERTY SUPPORTS DEFINE 1893 LOAD ZONE…. RF….. I …. JOINT WEIGHT

LOAD 1 SEISMIC X DIRECTION LOAD 2 SEISMIC Z DIRECTION LOAD 3 LOAD

LOAD 4 ….

LOAD COMB 11

PERFORM ANALYSIS

PRINT SUPPORT REACTION START CONCRETE DESIGN CODE INDIAN FC ….. ALL FYMAIN ….. ALL FYSEC …. ALL DESIGN COLUMN DESIGN BEAM

END CONCRETE DESIGN FINISH

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