CE Advanced Structural Analysis. Lab 2 SAP2000 Truss Structures

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1 Department of Civil & Geological Engineering COLLEGE OF ENGINEERING CE Advanced Structural Analysis Lab 2 SAP2000 Truss Structures January 23 rd, 2013 T.A: Ouafi Saha Professor: M. Boulfiza 0. Reminder of Basic Steps to Solve a Structural Problem using SAP Access to software 1. Start-up by choosing units, setting up grids or by choosing a model from the library 2. Define materials, element properties, loading patterns, analysis cases and combinations 3. Draw the model using the powerful graphical interface and selection and editing tools 4. Assign displacement boundary conditions (supports) 5. Assign loads (forces, moments, displacements, pressure, temperature ) 6. SOLVE system, use simplification if possible 7. Display Output in graphical and/or tabular form 8. Analyze results 1. Simple Truss Structure E = MPa A = 10 cm 2 Neglect self-weight 2m What is the vertical displacement at P? P = 15 kn 2m 3m New features: Edit Coordinate Systems/Grids The same steps: Units (kn, m, C) Grids X (0,2,5), Y(0), Z (0, 2) Choose XZ view Define Materials: we need only E=200 GPa, Element properties: we need only A = 10 cm 2 1

Only Cross section different from 0 Draw the model Assign Supports Assign one concentrated load at point P To avoid having warnings in

2 Many ways to do the analysis of Truss structures. The easiest way is to put all other geometric properties = 0 except the Cross Sectional (axial) Area. Only Cross section different from 0 Draw the model Assign Supports Assign one concentrated load at point P To avoid having warnings in the solver module, keep only UX and UZ DOF in the Analysis Options Keep only UX and UZ. No rotation SOLVE Display Output Displacement and forces Analyze results Deformed shape We can have the displacement of any node (joint) by right clicking on it. 2

The vertical displacement of point P is then U 3 = -5.784 10 - Internal forces In this case, only the Axial Forces are present 2. Elaborated Truss structure http://www.youtube.com/watch?

3 The vertical displacement of point P is then U 3 = Internal forces In this case, only the Axial Forces are present 2. Elaborated Truss structure 30kN Units kn, m, C Mat. Steel Self-Weight = 0 3 m 3 m 3 m 3 m 3 m 3 m The Top and Bottom chord section is double angle 2L5x5x7/16 The Braces section is rectangular 7x25 mm 2 New features: Import sections, Edit Divide, Releases - Run three analyses, perfect welding in all joints, hinges in all joints, only braces are hinged. - Compare the three cases - What is the maximum deflexion in each case? - What are the maximum internal forces in these cases? Follow the same eight steps. Use the following grid specification: X (-9, 0, 9), Y (0), Z (0, 4). The new features are explained below. 3

$the section profile Double Angle and the path for the section database should be C:\Program Files (x86)\computers and Structures\SAP2000 15 Then select SECTIONS8.PRO file.$ $Path: C:\Program Files (x86)\computers and Structures\ SAP2000 15 Local Disk C: SECTIONS8.$

4 Import section To use a section profile from the SAP2000 database, go to Define > Section Properties > Frame Sections then click on Import New Property Select the type of the section profile Double Angle and the path for the section database should be C:\Program Files (x86)\computers and Structures\SAP Then select SECTIONS8.PRO file. Path: C:\Program Files (x86)\computers and Structures\ SAP Local Disk C: SECTIONS8.PRO common Profile DB Finally, select the appropriate section from the list; 2L5x5x7/16 in this case. Edit divide option Select the four elements, two lower chords and two upper chords, and divide them into 3 segments each. Edit > Edit Lines > Divide Frames 4

00 2 m Find internal forces and the deflection at the applied load point.

5 Releasing the hinged elements Select elements, Assign > Frame > Releases/Partial Fixity 3. Additional Examples 2 m Units kn, m, C Self-Weight = 0 E = 200 GPa A = 1500 mm m Find internal forces and the deflection at the applied load point. Another detailed Truss example 5

CE Advanced Structural Analysis. Lab 1 Introduction to SAP2000

CE Advanced Structural Analysis. Lab 1 Introduction to SAP2000 Department of Civil & Geological Engineering COLLEGE OF ENGINEERING CE 463.3 Advanced Structural Analysis Lab 1 Introduction to SAP2000 January 09 th, 2013 T.A: Ouafi Saha Professor: M. Boulfiza Objectives: