STAAD Instruction Manual

STAAD – Structural Analysis and Design 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

©2006, General Training and Educational (GTE) Services, All rights reserved. Reproduction without prior written authorization is strictly prohibited.

STAAD Instruction Manual

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

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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.

9’-0”

Hinge Support

4 bays @10’-0” = 40’-0”

Roller Support

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.

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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.

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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

2. Click on Geometry and Beam tabs. 3. Set No. of grid lines and the grid spacing Click #2,14

Click #4,15

Click #6,16

Click #8,17 7. Click on Close

Click #1, 13*

Click #3,12

Click #5,11

Click #7,10

Click #9

5. Start adding members as shown by click numbers.

* After 13, press and hold Control key and then click on #14

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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

1. Make sure that you are in the Labels tab. 2. Check the Node numbers, Beam numbers and Load values checkboxes.

3. Click on Apply and then OK.

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4. Saving the structure: Click on File → Save as. Select appropriate folder and name the file as ‘Problem 5-7 Myname.std’

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5. Specifying supports Click on General tab on the left side and click on support tab.

2. Make sure that you are in pinned support tab.

1. Click on Add.

3. Click on Create.

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1. Highlight Support 2

4. Click and Select this node 2. Check Use cursor to assign

3. Click on Assign

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Part II: Creating Roller Supports:

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 Create.

1. Click on Add. Or if you have closed this dialogue box in the previous step again click on General and Supports tab.

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1. Highlight Support 3. 2. Check Use Cursor to Assign.

3. Click on Assign.

1. Select this node.

2. Click on Close

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6. Specifying Loads:

1. Select General and load tab

2. Type ‘point loads’ and click on OK.

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1. Click on Nodal.

2. Specify the value of the vertical load as –6 units. 3. Click on Add.

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Again Click on Nodal and repeat this procedure for 8 kips and 10 kips load.

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The truss should look like this…

Click on Close.

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.

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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.

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8. Specifying Materials:

1. Select General and Property tab

2. Click on Database

3. Select American.

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1. Select Angle tab.

3. Select L40308.

2. Select Long Leg Back to Back, Double angle. 5. Click on Add.

3. Click on individual members till all members get material R1.

1. Click on Use Cursor to Assign.

2. Click on Assign.

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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.

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10. Performing Analysis:

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11. Generating Post Analysis Report: 11-1 Member forces:

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11-2 Support reactions:

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12. Running Analysis: Click on Analyze → Run Analysis

Select STAAD Analysis

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13. Viewing the Output File and Interpreting Results:

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The axial force in member 1 is 9.43 kips. Tensile or compressive?? Let’s have a quick look at our model.

2 Positive direction

1 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.

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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 normal screen.

End of file

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STAAD Instruction Manual

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