Instruction Manual
Problem 5-7 page 123 Third Edition
Problem 5-7 page 129 Fourth Edition
Applied Statics and Strength of Materials Textbook
Leonard Spiegel and George F. Limbrunner
Table of Contents
1
Introduction………..
2
2
Creating A New Structure………
3
3
Generating the Model Geometry………..
4
4
Saving the Structure……….
6
5
Specifying Supports………..
7
6
Specifying Loads………...
11
7
Command File………
15
8
Specifying Materials………..
17
9
Printing Member Information………
18
10
Performing Analysis………..
20
11
Generating Post Analysis Report………...
21
12
Running Analysis………..
23
13
Viewing the Output File and Interpreting Results……..
24
14
Viewing Animated Deflected Shape of the Truss……...
26
-1. Introduction:
STAAD.Pro is software for STructural Analysis and Design from Research Engineers International (www.reiworld.com)
STAAD.Pro is used to generate a model of a truss, which can be analyzed using the same software. After modeling and analysis is completed, the Graphical User Interface (GUI) can also be used to view the results graphically.
In this manual, example 5-7 from Applied Statics and Strength of Materials book (3rd/4th Edition- Leonard
Spiegel and George F. Limbrunner) is solved using STAAD.Pro. The first section of this manual explains how to model the truss shown below.
In the second section, after analyzing the model, support reaction and member forces are printed. Using the animation capabilities of STAAD.Pro, a visualization of the deflected shape of the truss is obtained.
4 bays @10’-0” = 40’-0”
9’-0”
Hinge
2. Creating a New Structure:
2.1 To create a new structure, Click on File → New
2.2 To specify units
Note: Before you proceed, make sure that you have all the toolbars (icons) loaded in the
current session of STAAD. Click on View>Toolbars and check all boxes to import all
toolbars. Please note that the position of a certain toolbar may be different on your
screen. Also, the job info in the right side window is optional.
-3. Generating Model Geometry
3.1 Click on the Geometry tab on the left. Then click on Beam tab next to it.
Or
Select Geometry → Snap Grid/Node → Beam
1. Click here for FRONT view
* After 13, press and hold Control key and then click on #14
Click #1, 13* Click #2,14 Click #3,12 Click #4,15 Click #5,11 Click #6,16 Click #7,10 Click #8,17 Click #9
2. Click on Geometry and Beam tabs.
3. Set No. of grid
lines and the grid spacing
5. Start adding members as shown by click numbers. 4. Make sure that Snap Node/Beam is active.
3.2 To view the node and beam numbers Click View> Structure Diagrams and select Labels tab
Or Click here
6
-2. Check the Node
numbers, Beam numbers and Load values checkboxes.
3. Click on Apply
and then OK.
1. Make sure that
you are in the
4. Saving the structure:
5. Specifying supports
Click on General tab on the left side and click on support tab.
8
-2. Make sure that
you are in pinned support tab.
1. Highlight
Support 2
4. Click and
Select this node
2. Check Use
cursor to assign
3. Click on
Part II: Creating Roller Supports:
10
-1. Click on Add. Or
if you have closed this dialogue box in the previous step again click on
General and Supports tab.
3. A roller support is a
fixed support without these reactions. So we have to release these reactions.
Check these boxes.
2. Select fixed But
tab
4. Click on
1. Highlight Support 3. 2. Check Use Cursor to Assign. 3. Click on Assign. 1. Select this node. 2. Click on Close
6. Specifying Loads:
12
-1. Select General and load
tab
2. Type ‘point loads’ and
1. Click on Nodal.
2. Specify the value
of the vertical load as –6 units.
14
-Again Click on Nodal and repeat this procedure for 8 kips and 10 kips load.
If the forces and arrowheads look smaller, you may change the scale by which a force is being represented. Click on View> Structure Diagrams and in the scales tab change the point force scale to 1kip per foot.
7. Command File:
Command file is a history file which records all procedures you have done while designing a truss problem. When an analysis is run, this command file is executed. Please click on Edit → Edit Input file to see the contents. Command file and the Graphical User Interface are bi-directional, which means if you make any changes in command file, your truss model will be updated automatically. Any standard text editor such as Notepad or Textpad can also be used to create the command file, but the build –in editor of STAAD.Pro offers the advantage of syntax checking as we type the commands.
-8. Specifying Materials:
18
-1. Select General and Property tab
2. Click on Database
1. Select
Angle tab.
2. Select Long Leg
Back to Back, Double angle.
3. Select
L40308.
1. Click on Use Cursor
to Assign.
3. Click on individual members till all members get material R1.
9. Printing Member Information:
Member information such as element number and its associated nodes can be printed in our final output result file. This can be done without (or before) the actual analysis while being in the modeling stage of truss design.
11. Generating Post Analysis Report:
11-1 Member forces:
-12. Running Analysis:
Click onAnalyze → Run Analysis
Select STAAD Analysis
26
-The axial force in member 1 is 9.43 kips.
Tensile or compressive??
Let’s have a quick look at our model.
Positive direction
Member 1 is defined as FROM 1 TO 2. Hence the positive direction of axis is
FROM 1 TO 2.
At joint 1, force is positive. (Directed towards 2) and at joint 2, force is negative, (directed towards 1)
Hence, the force in member 1 is
compressive.
1
14. Viewing Animated Deflected Shape Of The Truss:
1. Select the animation tab.
2. Check Deflection.
3. Specify these values. You can play with these values to obtain different intermediate shapes as well as speeds.
4. Hit F12 for a full screen display. Press F12 again to return back to
