Staad Tutorial

AISC/ASCE STUDENT STEEL BRIDGE COMPETETION – 2009

ANALYSIS AND DESIGN OF STEEL BRIDGES USING STAAD.Pro V8i

By

BENTLEY STRUCTURAL GROUP

30th October 2008

1.0 Introduction The Student Steel Bridge Competition is sponsored by the American Society of Civil Engineers (ASCE) and the American Institute of Steel Construction (AISC), and co-sponsored by the American Iron and Steel Institute, Bentley Systems, Incorporated, the Canadian Institute of Steel Construction, the James F. Lincoln Arc Welding Foundation, the National Steel Bridge Alliance, the Nucor Corporation, and the Steel Structure Education Foundation. Students design and erect a steel bridge by themselves but may seek advice from faculty and student organization advisers. The purpose of this document is to help students analyze and design their bridge models using Bentley’s STAAD.Pro V8i. STAAD.Pro is the professional’s choice for steel, concrete, timber, aluminum and cold-formed steel design of low and high-rise buildings, culverts, petrochemical plants, tunnels, bridges, piles and much more. It is a general purpose structural analysis and design tool.

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2.0 Creating the Bridge Geometry/Structural Analysis STAAD.Pro can make your bridge design and analysis task easier. The bridge geometry in STAAD.Pro can be constructed in many ways: 1. 2. 3. 4. 5.

STAAD.Pro user interface Structure Wizard Using a DXF import (importing a dxf MicroStation or AutoCAD drawing) Bentley Structural ProSteel 3D

In this case the bridge geometry will be created using Structure Wizard. The bridge geometry is shown in Figure 1. The width of the bridge is 2’.

Figure 1: Bridge Geometry

A conservative 2.5” x 2.5” steel section will be used for the entire bridge top and bottom cord. All other members will be 2” x 2”. Note: If custom cross sections are used for the bridge members, the custom shapes can be modeled as General Sections. You may have to use STAAD.SectionWizard. Alternatively, a General Section can be also created in STAAD.Pro V8i using the instructions on the following link: ftp://ftp2.bentley.com/dist/collateral/Web/Building/STAADPro/Modeling_Custom Shapes in STAAD_PRO.pdf The following three load cases will be created: Table 1: Bridge Loading

Loading Type Vertical Load 1

Components Self weight of the structure Deck Loading 0.005 kip/sq.ft Distributed Load as shown below: 1.25 kip/(4 members*1.5ft long members) = 0.2083 k/ft load on each member. Assume L1=3ft and L2=12ft (1)

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Vertical Load 2

Self weight of the structure Deck Loading 0.005 kip/sq.ft Distributed Load as shown below: 1.25 kip/(4 members*1.5ft long members) = 0.2083 k/ft load on each member. Assume L1=6ft and L2=9ft

Lateral Load

Self weight of the structure Deck Loading 0.005 kip/sq.ft 0.05 kip point Load as shown below

Notes: (1) L1 and L2 are defined in section 8 of STUDENT STEEL BRIDGE COMPETITION - 2009 RULES

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3.0 STEP-BY-STEP TUTORIAL Geometry Generation: 1. Launch STAAD.Pro by clicking on the Start->All Programs->STAAD.Pro V8i->STAAD.Pro icon. The STAAD.Pro V8i introduction screen will appear as shown in Figure 2. Note: Make sure that US Design Codes is checked and has a green light besides it. The US Design Codes is not checked, you will need to check this box and close the STAAD.Pro interface and re-open it again.

Figure 2: STAAD.Pro Introduction Screen

2. Click on File->Configure. The Configure Program dialog box will appear. Make sure that the Base Unit is set to English. Note: If you will be constructing your bridge model in the metric unit system, make sure that you set the base unit system to Metric.

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Figure 3: Base Unit System Setup

3. Click on the File->New menu command. The New dialog box will appear. 4. Provide the model options as shown in Figure 4.

Figure 4: The New Dialog box

5. Click on the Next button. The Where do you want to go Today? Dialog box will appear as shown in Figure 5. 6. Click on the Finish button. 7. The STAAD.Pro V8i user interface will appear as shown in Figure 6.

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Figure 5: The Where do you want to go Today? dialog box

Figure 6: STAAD.Pro User Interface

8. You could create the bridge geometry using the grid options shown in Figure 6. Appendix A of this document illustrates the procedure of creating a simple bridge geometry using the grid system. You could also create a bridge geometry using MicroStation XM and export that drawing as a dxf. Appendix B discusses how this can be achieved. In this tutorial, the Structure Wizard will be used to create the bridge geometry. 9. Click on the Geometry->Run Structure Wizard menu command. The Structure Wizard user interface will appear as shown in Figure 7.

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Figure 7: Structure Wizard User Interface

10. Double click on the Howe Bridge icon on the left. The Select Parameters dialog box will appear as shown in Figure 8. Note: In this dialog box, you can adjust the bay-to-bay spacing by simply clicking on the … icon. Make sure that the summation of the bay-spacing is equal to total length and width that you have specified respectively.

Figure 8: Structure Wizard User Interface

11. Input the parameters in the Select Parameters dialog box as illustrated in Figure 8. 12. Press the Apply button. The structural geometry will appear as shown in Figure 9.

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Figure 9: Bridge Structure Geometry in Structure Wizard

13. To transfer the structure to STAAD.Pro, select the File->Merge Model With STAAD.Pro Model menu command. Structure Wizard interface will close and a conformation dialog box will appear.

Figure 10: Confirmation dialog box

14. Click Yes for the conformation dialog box. The Paste Prototype Model dialog box will appear. 15. Click on the Ok button. The bridge geometry will be created in STAAD.Pro as shown in Figure 11. Note: The Y Axis should be the axis of gravity in your STAAD.Pro models.

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Figure 11: Bridge geometry in STAAD.Pro interface

19. The bridge geometry seen in Figure 11 has to be mirrored in the XZ-plane. 20. Select the Beams Cursor from the left hand side.

Figure 12: Beams Cursor

21. Select all the beams in the graphics window. Ctrl + A will select all the beams in the model.

22. Click on Geometry->Mirror command. The Mirror dialog box will appear as shown in Figure 13.

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Figure 13: The Mirror dialog box

23. Input the mirror parameters as shown in Figure 13. 24. Click the OK button. The structure will be mirrored about the X-Z plane as shown in Figure 14.

Figure 14: Bridge structure is mirrored about the X-Z plane

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Note: Basic 3D Navigation Tools: Use the arrow keys on the keyboard to rotate structure, the middle mouse roller button to zoom in and out. If you press the roller button and hold it down, you will be able to pan. You may also use the icons in the icon bar. )

(i.e.

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Property Assignment: 25. Click the General tab on the left. 26. Click on the Define button in the data area. 27. Select the Rectangle property item in the Property dialog box and provide the inputs as shown in Figure 15. Note: The unit converter can be launched by pressing the F2 key. If you enter 2 “ and press the enter key in the unit converter, the text box will display the dimension converted to the default unit system being used in your model. The space is required between the dimension and the unit for the unit converter. For example, 12in will not work but 12 in will work.

Figure 15: Property Definition

28. Click the Add button. 29. Select the Rectangle property item from the left hand side and provide the inputs as shown in Figure 16.

Figure 16: Property Definition

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30. Click the Close button. The property definitions should appear in the Properties dialog box in the Data Area. 31. Select the Rect 2.5x2.5 property in the Properties dialog box in the Data Area. 32. Click on the Select->Select Beams Parallel to->X Axis menu command. 33. Select the Assign to Selected Beams assignment option in the Properties dialog box. 34. Click on the Assign button. The property reference number will appear in the graphics window. 35. Select the Rect 2x2 property in the Properties dialog box in the Data Area. 36. Click on the Select->By Missing Attributes->Missing Property menu command. 37. Click on the Assign button. The property reference number will appear in the graphics window. 38. Click anywhere in the white space in the graphics window to get rid of the member selection. Right click in the Graphics Window and select the 3D Rendering. The rendered view of the structure will appear in a separate window as shown in Figure 17.

Figure 17: 3D Rendered View of the structure

Note: Standard AISC sections are available by clicking the Section Database button on the right. In the American Databases, Pipes and Tubes can be created using the Tubes and Pipes items in the Section Profile dialog box. The American section database can be modified by clicking on Tools->Modify Section Database menu command.

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Specification Assignment: 39. Click on the General->Specifications control tab on the left. 40. Click on the Beam button in the Specifications dialog box on the right. The Member Specifications dialog box will appear as shown in Figure 18.

Figure 18: Member Specification dialog box

41. Select the Truss tab in the Member Specifications dialog box. 42. Click the Add button. 43. Click the Close button. 44. Select the Elevation View of the structure by clicking on the

icon.

45. Select the diagonal bracing members as illustrated in Figure 19.

Figure 19: Diagonal members are selected in the elevation view

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46. Select the MEMBER TRUSS specification in the Specifications dialog box in the data area. 47. Select the Assign to Selected Beams assignment method and click on the Assign button. Note: Assigning too many releases may make the structure unstable. Pay close attention to how the beam elements will behave in the real structure and the type of connections that are provided at the joints. Always check the Statics Check in the post processing mode to make sure that the structure is in equilibrium for all load cases.

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Support Assignment: 48. Click on the General->Supports control tab on the left. 49. Click the Create button in the Supports dialog box on the right. The Create Support dialog box will appear as shown in Figure 20.

Figure 20: Create Support dialog box

50. Select the Pinned tab in the Create Support dialog box. 51. Click on the Add button. 52. Click the Cancel button. 53. Select the Nodes Cursor on the left.

Figure 21: The Nodes Cursor

54. Select the S2 Support 2 support in the Supports dialog box in the Data Area.

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55. Select the Support Nodes as shown in Figure 22.

Figure 22: Nodes selected using the Nodes Cursor

56. Select the Assign to Selected Nodes assignment method in the Supports dialog box and press the Assign button. Press Yes on the confirmation dialog box. The pinned supports should be displayed in the STAAD.Pro graphics window as shown in Figure 22.

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Figure 23: Pinned supports seen in the STAAD.Pro graphics window

57. Select the Assign to Selected Nodes Assignment Method in the Supports dialog box and press the Assign button. Press Yes on the confirmation dialog box. The pinned supports should be displayed in the STAAD.Pro graphics window as shown in Figure 23.

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Load Assignment: 58. Click on the General->Loads & Definition control tab on the left. 59. Click on the Load Cases Details tree item on the right. Three load cases have to be created. 60. Click on the Add button in the Load & Definitions dialog box on the right. The Add New: Load Cases dialog box will appear as shown in Figure 24.

Figure 24: Add New: Load Cases dialog box

61. Enter Vertical Load 1 in the Title text input box as shown in Figure 24. Press the Add button. 62. Enter Vertical Load 2 in the Title text input box. Press the Add button. 63. Enter Lateral Load in the Title text input box. Press the Add button. 64. Press the Close button. We will now attempt to add the selfweight load to all load cases. 65. Select the Vertical Load 1 title in the Load Cases Details tree item on the right. 66. Click on the Add button. The Add New: Load Items dialog box will appear as shown in Figure 25.

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Figure 25: Selfweight Definition

67. Select the inputs as shown in Figure 25 and press the Add button. 68. Move the Add New: Load Items dialog box to the left so that you can see the Load & Definitions dialog box on the right as shown in Figure 26.

Figure 26: The Add New: Load Items dialog box has been moved to the left.

69. Select the Vertical Load 2 title in the Load Cases Details tree item on the right. 70. Select the inputs as shown in Figure 25 and press the Add button. 71. Select the Lateral Load title in the Load Cases Details tree item on the right. 72. Select the inputs as shown in Figure 25 and press the Add button. As a result of the above eights steps, every load item should have SELFWEIGHT Y -1 included.

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We will now attempt to add the deck load as a floor load of 0.005 ksf to all load cases. If you have bracing underneath the deck, the floor load generation has to be done using the floor group. If your deck is not level, the floor load generation has to be generated using the “inclined roof” option. 73. Select the Vertical Load 1 title in the Load Cases Details tree item on the right. 74. Select the Floor Load item in the Add New: Load Items dialog box. 75. Enter the floor load generation parameters as shown in Figure 27 and press the Add button.

Figure 27: Floor Load generation parameters.

76. Select the Vertical Load 2 title in the Load Cases Details tree item on the right. 77. Enter the inputs as shown in Figure 27 and press the Add button. 78. Select the Lateral Load title in the Load Cases Details tree item on the right. 79. Enter the inputs as shown in Figure 27 and press the Add button. As a result of the above eight steps, every load item should have YRANGE command included as shown in Figure 28.

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Figure 28: Floor Load generation commands

We will now attempt to add the test loads to all load cases as distributed loads. 80. Select the Vertical Load 1 title in the Load Cases Details tree item on the right. 81. Select the Member Load->Uniform Force item in the Add New: Load Items dialog box. 82. Input -0.2083 in the W1 input box as shown in Figure 29. 83. Click the Add button. 84. Select the Vertical Load 2 title in the Load Cases Details tree item on the right. 85. Select the Member Load->Uniform Force item in the Add New: Load Items dialog box. 86. Input -0.2083 in the W1 input box as shown in Figure 29. 87. Click the Add button. 88. Select the Lateral Load title in the Load Cases Details tree item on the right. 89. Select the Member Load->Uniform Force item in the Add New: Load Items dialog box. 90. Input -0.025 in the W1 input box. 91. Click the Add button. 92. Select the Nodal Load->Node item in the Add New: Load Items dialog box.

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93. Input 0.05 in the Fz input box. 94. Click the Add button.

Figure 29: Uniform Load

95. Click the Close button. 96. Select the Selfweight in the Vertical Load 1 data area and select the Assign to View assignment method. 97. Click the Assign button. Click the OK button on the confirmation dialog box. 98. Repeat the above two steps for Vertical Load 2 and Lateral Load. 99. Select the eight beams as shown in Figure 30. You can use the Tools->Display Node to Node Distance menu command to measure the distances as shown in Figure 30. To remove the node dimensions, click on Tools->Remove Dimension menu command. 100. Select the UNI GY -0.2083 kip/ft command in Vertical Load 1 and select the Assign to Selected Beams assignment method. 101.

Click the Assign button. Click the OK button on the confirmation dialog box.

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Note: If you want to remove loads from a member, you could use the Toggle Load check box in the Load & Definitions dialog box.

Figure 30: Location of Uniform Load for Vertical Load 1

102.

Select the eight beams as shown in Figure 31.

103. Select the UNI GY -0.2083 kip/ft command in Vertical Load 2 and select the Assign to Selected Beams assignment method. 104.


105.

Select the two mid-span beams as shown in Figure 32.

106. Select the UNI GY -0.025 kip/ft command in Lateral Load case and select the Assign to Selected Beams assignment method. 107.


108.

Select the Nodes cursor and select mid-span node as shown in Figure 33.

109. Select the FZ 0.05 kip/ft command in Lateral Load case and select the Assign to Selected Nodes assignment method. 110.


Note: If the loads are too small in the graphics window, right click in the graphics window and choose labels->scales and provide appropriate scales for the loadings.

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Figure 31: Location of Uniform Load for Vertical Load 2

Figure 32: Location of Uniform Load for Lateral Load 2

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Figure 33: Location of lateral load application node point for Lateral Load case

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Analysis: 111. Click on Analysis/Print control tab on the left. The Analysis/Print Commands dialog box will appear. 112.

Select the All option in the Perform Analysis tab and press the Add button.

Figure 34: The Analysis/Print Commands dialog box

113.

Click the Close button.

114. Click on Analyze->Run Analysis command. The STAAD Analysis and Design dialog box will appear. 115.

You should not have zero errors in the STAAD Analysis and Design dialog box.

116.

Select the Go To Post Processing Mode option button and click on the OK button.

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Results: 117. Select the Node->Displacement tab. The displacement of each and every node can be determined by simply clicking on a node point in the graphics window and looking at the displacement table on the right.

Figure 35: Displacements

118. Select the Node->Reactions tab. The support reaction of each and every support node can be determined by simply clicking on a node point in the graphics window and looking at the support reaction table on the right. Note: Make sure that the Difference row for each load case in the Statics Check Results window is close to zero. A non-zero value usually indicates instability in the structure. You may use the 0.99 MPX 0.99 MPY 0.99 MPZ at the joints to avoid using a completely released joint.

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Figure 36: Support Reactions

119. Select the Beam->Forces tab. The bending moment diagram will be displayed. The user may turn on the deflection and loading diagrams using the icons.

Figure 37: Beam end and section forces

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Figure 38: Moment, deflection and load diagram

120. Select the Beam->Stresses tab. The combined axial stress distribution diagram can be seen for any member.

Figure 39: Combined Axial and Bending Diagram

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121. Select the Beam->Graphs tab. The moment, shear, and axial force diagram can be seen for any member.

Figure 40: Moment, shear, and axial force diagram

122.

Click on the Modeling tab.

123. Right click in the graphical user interface and select Labels. Suppose you wanted to see the members that had a combined axial and bending stress of 500 psi. 124.

Select the Force Limits tab and provide the inputs as shown in Figure 41.

125. Click on the Apply button. The beams shown in red in Figure 42 have exceeded the combined axial and bending stress of 500 psi. 126.

This procedure can be used to find which members are exceeding the 30 ksi criteria.

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Figure 41: Force Limits

Figure 42: Combined axial and bending stress contour

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Experiment with the model and try changing some of the strut connections to partial moment releases. Try changing the section sizes of the members along the x-axis 1 in x 1 in rectangular sections and the rest of the members to 0.75 in x 0.75 in sections. You will note that some bars have exceeded the 30 ksi limit as shown in Figure 43 for the lateral load case. Keep connection design in mind also. Section cross section will be reduced in tension.

Figure 43: Combined axial and bending stress contour

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Design (Not Applicable to this example): Note: STAAD.Pro cannot perform code checking on square prismatic steel sections defined in this model. The user could define a general section or create a tube section using the section database to perform the code checking as per the AISC 360-05 code. 127.

Click on Design->Steel control tab on the left.

128.

Select the AISC 360-05 code in the Current Code selection box in the data area.

129. Click the Define Parameters button in the data area. The Design Parameters dialog box will appear as shown in Figure 35. 130. Select the FYLD design parameter and enter and assign the yield strength of steel to be used for the bridge if not 36 ksi. In the case of this tutorial, the default yield strength (i.e. 36 ksi) will be used. 131.

Click on the Close button

132.

Click the Commands button. The Design Commands dialog box will appear.

133.

Select the Check Code command and press the Add button

134.

Assign the Check Code command to all members.

Figure 42: The Design Parameters dialog box

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4.0 Help, Questions, Comments There is a lot of help available for STAAD.Pro in electronic format. You may press the F1 key in the STAAD.Pro interface to look the help documents. You may send your STAAD.Pro related questions or comments to [email protected].

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Finally. Thank you for using Bentley Products and Wish You all the best!

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APPENDIX A

CREATING BRIDGE GEOMETRY USING STAAD.Pro V8i GRID SYSTEM

1. The goal of the next few steps is to draw the stick model of the bridge structure using the STAAD.Pro V8i drawing grid system. 2. Click the Geometry control tab on the left hand side. On the right hand side of your screen, you should see a Snap Node/Beam dialog box. If you do not see this dialog box, you may view this by simply clicking on Geometry->Snap/Grid Node->Beam menu item.

Figure A1: Snap/Node Beam dialog box

3. Click on the Create button. 4. The Grid Definition dialog box will appear as shown in Figure A2.

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Figure A2: Grid definition dialog box

5. Input the grid creation parameters as shown in Figure A2. 6. Click the Ok button. 7. The Linear entry will appear in the Snap/Node Beam dialog box. Check the Linear entry and you will notice that the linear grid will appear in the STAAD.Pro graphics window.

Figure A3: Grid Creation

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8. Click the Snap/Node/Beam button and create the grillage of beams as shown in Figure A4.

Figure A4: Grid Creation


10. Select the Beams Cursor from the left hand side.

Figure A4: Beams Cursor


12. Click on Geometry->Translational repeat command. The 3D Repeat dialog box will appear as shown in Figure A5.

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Figure A5: 3D Repeat dialog box

13. Input the 3D Repeat parameters as shown in Figure A5. 14. Click the OK button. The bridge geometry will be created as shown in Figure A6.

Figure A6: Translational Repeat

15. Create the vertical diagonal members using the Geometry->Add Beam->Add Beam From Point to Point menu command.

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Figure A7: Vertical diagonals created using the Geometry->Add Beams menu command


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APPENDIX B

CREATING BRIDGE GEOMETRY USING STAAD.Pro V8i DXF IMPORT

1. Open MicroStation XM. 2. Open the DGN_Example.dgn file distributed with this tutorial.

Figure B1: Elliptical Base Bridge stick model constructed in MicroStation

3. Click on file File->Export->DGN, DWG, DXF. The Export File dialog box will appear as shown in Figure B2. 4. Select the dxf export option as shown in Figure B2.

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Figure B2: The Export File dialog box in Microstation

5. Select an appropriate location to save the dxf file. Click the Save button. 6. Close MicroStation. 7. Launch STAAD.Pro by clicking on the Start->All Programs->STAAD.Pro V8i->STAAD.Pro icon. The STAAD.Pro V8i introduction screen will appear. 8. Click on the File->New menu command. The New dialog box will appear. 9. Provide the model options as shown in Figure B3.

Figure B3: The New Dialog box

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10. Click on the Next button. The Where do you want to go Today? Dialog box will appear as shown in Figure B4. 11. Click on the Finish button.

12. The STAAD.Pro V8i user interface will appear as shown in Figure B5.

Figure B4: The Where do you want to go Today? dialog box

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Figure B5: STAAD.Pro User Interface

13. Click on File->Import menu command. The Import dialog box will appear as shown in Figure B6.

Figure B6: The Import dialog box

14. Select the 3D DXF import option and click the Import button. 15. The Open dialog box will appear. Select the DGN_Example.dxf file which was created in Step 5. 16. Click on the Open button. The DXF Import dialog box will appear as shown in Figure B7.

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17. Select the Y Up option. The Y Axis should be the axis of gravity in your STAAD.Pro models. 18. Click on the OK button. The Set Current Input Units box will appear. The MicroStation file was created using the foot unit system. Select Foot and KiloPound in the Set Current Input Units box and press the OK button. The bridge geometry will appear as shown in Figure B8.


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Figure B8: Bridge Frame Imported from MicroStation

19. Delete the unwanted lines as highlighted in Red in Figure B8. The STAAD.Pro user must check if the imported model is ok from a structural analysis point of view. The Tools menu command is very useful for checking structural integrity of the imported stick model. For more information about dxf import/export please refer to the whitepaper on the following link: ftp://ftp2.bentley.com/dist/collateral/Web/Building/STAADPro/DXF_Import_into_STAAD_PRO.pdf 20. Click the Snap/Node/Beam button and create the grillage of beams as shown in Figure A4.

21. Select the Beams Cursor from the left hand side.

Figure B9: Beams Cursor


23. Click on Geometry->Translational repeat command. The 3D Repeat dialog box will appear as shown in Figure B10.

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Figure B10: 3D Repeat dialog box

24. Input the 3D Repeat parameters as shown in Figure B10. 25. Click the OK button. The bridge geometry will be created as shown in Figure B11.

Figure B11: Translational Repeat

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APPENDIX C

STAAD.Pro Input Command File

You may copy the following text into the STAAD.Pro editor to view this model in STAAD.Pro To Launch the STAAD.Pro editor click on Edit->Edit Input Command File menu command. Replace the text in the editor with the following text.

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STAAD SPACE START JOB INFORMATION ENGINEER DATE 29-Oct-08 END JOB INFORMATION INPUT WIDTH 79 UNIT FEET KIP JOINT COORDINATES 1 0 0 0; 2 1.5 0 0; 3 3 0 0; 4 4.5 0 0; 5 6 0 0; 6 7.5 0 0; 7 9 0 0; 8 10.5 0 0; 9 12 0 0; 10 13.5 0 0; 11 15 0 0; 12 16.5 0 0; 13 18 0 0; 14 1.5 -2 0; 15 3 -2 0; 16 4.5 -2 0; 17 6 -2 0; 18 7.5 -2 0; 19 9 -2 0; 20 10.5 -2 0; 21 12 -2 0; 22 13.5 -2 0; 23 15 -2 0; 24 16.5 -2 0; 25 0 0 2; 26 1.5 0 2; 27 3 0 2; 28 4.5 0 2; 29 6 0 2; 30 7.5 0 2; 31 9 0 2; 32 10.5 0 2; 33 12 0 2; 34 13.5 0 2; 35 15 0 2; 36 16.5 0 2; 37 18 0 2; 38 1.5 -2 2; 39 3 -2 2; 40 4.5 -2 2; 41 6 -2 2; 42 7.5 -2 2; 43 9 -2 2; 44 10.5 -2 2; 45 12 -2 2; 46 13.5 -2 2; 47 15 -2 2; 48 16.5 -2 2; MEMBER INCIDENCES 1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 6 7; 7 7 8; 8 8 9; 9 9 10; 10 10 11; 11 11 12; 12 12 13; 13 14 15; 14 15 16; 15 16 17; 16 17 18; 17 18 19; 18 19 20; 19 20 21; 20 21 22; 21 22 23; 22 23 24; 23 2 14; 24 3 15; 25 4 16; 26 5 17; 27 6 18; 28 7 19; 29 8 20; 30 9 21; 31 10 22; 32 11 23; 33 12 24; 34 1 14; 35 13 24; 36 2 15; 37 4 15; 38 4 17; 39 6 17; 40 6 19; 41 8 19; 42 8 21; 43 10 21; 44 10 23; 45 12 23; 46 25 26; 47 26 27; 48 27 28; 49 28 29; 50 29 30; 51 30 31; 52 31 32; 53 32 33; 54 33 34; 55 34 35; 56 35 36; 57 36 37; 58 38 39; 59 39 40; 60 40 41; 61 41 42; 62 42 43; 63 43 44; 64 44 45; 65 45 46; 66 46 47; 67 47 48; 68 26 38; 69 27 39; 70 28 40; 71 29 41; 72 30 42; 73 31 43; 74 32 44; 75 33 45; 76 34 46; 77 35 47; 78 36 48; 79 25 38; 80 37 48; 81 26 39; 82 28 39; 83 28 41; 84 30 41; 85 30 43; 86 32 43; 87 32 45; 88 34 45; 89 34 47; 90 36 47; 91 1 25; 92 2 26; 93 3 27; 94 4 28; 95 5 29; 96 6 30; 97 7 31; 98 8 32; 99 9 33; 100 10 34; 101 11 35; 102 12 36; 103 13 37; 104 14 38; 105 15 39; 106 16 40; 107 17 41; 108 18 42; 109 19 43; 110 20 44; 111 21 45; 112 22 46; 113 23 47; 114 24 48; DEFINE MATERIAL START ISOTROPIC STEEL E 4.176e+006 POISSON 0.3 DENSITY 0.489024 ALPHA 6.5e-006 DAMP 0.03 END DEFINE MATERIAL MEMBER PROPERTY BRITISH 1 TO 22 46 TO 67 PRIS YD 0.208333 ZD 0.208333 23 TO 45 68 TO 114 PRIS YD 0.166667 ZD 0.166667 CONSTANTS MATERIAL STEEL ALL MEMBER TRUSS 36 TO 45 81 TO 90

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SUPPORTS 1 13 25 37 PINNED LOAD 1 LOADTYPE None TITLE VERTICAL LOAD 1 FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 2 3 8 9 47 48 53 54 UNI GY -0.2083 LOAD 2 LOADTYPE None TITLE VERTICAL LOAD 2 FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 4 5 10 11 49 50 55 56 UNI GY -0.2083 LOAD 3 LOADTYPE None TITLE LATERAL LOAD FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 6 7 UNI GY -0.025 JOINT LOAD 31 FZ 0.05 PERFORM ANALYSIS PRINT ALL FINISH

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APPENDIX D

Experiment - STAAD.Pro Input Command File

STAAD SPACE START JOB INFORMATION ENGINEER DATE 29-Oct-08 END JOB INFORMATION INPUT WIDTH 79 UNIT FEET KIP JOINT COORDINATES 1 0 0 0; 2 1.5 0 0; 3 3 0 0; 4 4.5 0 0; 5 6 0 0; 6 7.5 0 0; 7 9 0 0; 8 10.5 0 0; 9 12 0 0; 10 13.5 0 0; 11 15 0 0; 12 16.5 0 0; 13 18 0 0; 14 1.5 -2 0; 15 3 -2 0; 16 4.5 -2 0; 17 6 -2 0; 18 7.5 -2 0; 19 9 -2 0; 20 10.5 -2 0; 21 12 -2 0; 22 13.5 -2 0; 23 15 -2 0; 24 16.5 -2 0; 25 0 0 2; 26 1.5 0 2; 27 3 0 2; 28 4.5 0 2; 29 6 0 2; 30 7.5 0 2; 31 9 0 2; 32 10.5 0 2; 33 12 0 2; 34 13.5 0 2; 35 15 0 2; 36 16.5 0 2; 37 18 0 2; 38 1.5 -2 2; 39 3 -2 2; 40 4.5 -2 2; 41 6 -2 2; 42 7.5 -2 2; 43 9 -2 2; 44 10.5 -2 2; 45 12 -2 2; 46 13.5 -2 2; 47 15 -2 2; 48 16.5 -2 2; MEMBER INCIDENCES 1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 6 7; 7 7 8; 8 8 9; 9 9 10; 10 10 11; 11 11 12; 12 12 13; 13 14 15; 14 15 16; 15 16 17; 16 17 18; 17 18 19; 18 19 20; 19 20 21; 20 21 22; 21 22 23; 22 23 24; 23 2 14; 24 3 15; 25 4 16; 26 5 17; 27 6 18; 28 7 19; 29 8 20; 30 9 21; 31 10 22; 32 11 23; 33 12 24; 34 1 14; 35 13 24; 36 2 15; 37 4 15; 38 4 17; 39 6 17; 40 6 19; 41 8 19; 42 8 21; 43 10 21; 44 10 23; 45 12 23; 46 25 26; 47 26 27; 48 27 28; 49 28 29; 50 29 30; 51 30 31; 52 31 32; 53 32 33; 54 33 34; 55 34 35; 56 35 36; 57 36 37; 58 38 39; 59 39 40; 60 40 41; 61 41 42; 62 42 43; 63 43 44; 64 44 45; 65 45 46; 66 46 47; 67 47 48; 68 26 38; 69 27 39; 70 28 40; 71 29 41; 72 30 42; 73 31 43; 74 32 44; 75 33 45; 76 34 46; 77 35 47; 78 36 48; 79 25 38; 80 37 48; 81 26 39; 82 28 39; 83 28 41; 84 30 41; 85 30 43; 86 32 43; 87 32 45; 88 34 45; 89 34 47; 90 36 47; 91 1 25; 92 2 26; 93 3 27; 94 4 28; 95 5 29; 96 6 30; 97 7 31; 98 8 32; 99 9 33; 100 10 34; 101 11 35; 102 12 36; 103 13 37; 104 14 38; 105 15 39; 106 16 40; 107 17 41; 108 18 42; 109 19 43; 110 20 44; 111 21 45; 112 22 46; 113 23 47; 114 24 48; DEFINE MATERIAL START ISOTROPIC STEEL E 4.176e+006 POISSON 0.3 DENSITY 0.489024 ALPHA 6.5e-006 DAMP 0.03 ISOTROPIC CONCRETE E 453600 POISSON 0.17 DENSITY 0.14999 ALPHA 5.5e-006

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DAMP 0.05 END DEFINE MATERIAL MEMBER PROPERTY BRITISH 1 TO 22 46 TO 67 PRIS YD 0.083333 ZD 0.083333 23 TO 45 68 TO 114 PRIS YD 0.0625 ZD 0.0625 CONSTANTS MATERIAL STEEL ALL MEMBER TRUSS 36 TO 45 81 TO 90 SUPPORTS 1 13 25 37 PINNED MEMBER RELEASE 23 TO 35 68 TO 80 91 TO 114 START MPY 0.99 MPZ 0.99 23 TO 35 68 TO 80 91 TO 114 END MPY 0.99 MPZ 0.99 LOAD 1 LOADTYPE None TITLE VERTICAL LOAD 1 FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 2 3 8 9 47 48 53 54 UNI GY -0.2083 LOAD 2 LOADTYPE None TITLE VERTICAL LOAD 2 FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 4 5 10 11 49 50 55 56 UNI GY -0.2083 LOAD 3 LOADTYPE None TITLE LATERAL LOAD FLOOR LOAD YRANGE -1 1 FLOAD -0.005 GY SELFWEIGHT Y -1 LIST 1 TO 114 MEMBER LOAD 6 7 UNI GY -0.025 JOINT LOAD 31 FZ 0.05 PERFORM ANALYSIS PRINT ALL FINISH

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Staad Tutorial

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