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This tutorial was initially written for SAP2000, but the general procedure applies also to CSiBridge.
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The procedure to run pushover analysis in SAP2000 V12 is outlined by the steps listed below.
h1. Create Computer Model
* Create the basic computer model (without the pushover data) in the usual manner.
* Define properties for [pushover hinges|kb:Hinge] using Define > Section Properties > Hinge Properties menu command. The program includes several default build-in hinge properties and the user-defined properties are also available.
* Assign the pushover hinges to the frame elements in the model by using Assign > Frame > Hinges menu command.
* Define [Load pattern|kb:Load pattern] (Define > Load Patterns) that will contain the loads to be applied in the pushover analysis.
h1. Define Nonlinear Static Load Case
* Define static nonlinear [load case|kb:load case] using Define > Load Cases > Add New Load Case menu command. Load pattern specified in the previous step would be entered as the applied load. The load case can be force controlled, that is, pushed to a certain defined force level, or they can be displacement controlled, this is, pushed to a specific displacement.
* Set Other Parameters > Results Saved to Multiple States, this will enable you to plot various parameters for each increment of the applied load.
h1. Run The Analysis
* Analyze the model using Analyze > Run Analysis menu command.
h1. Review Results
* Display > Show Static Pushover Curve enables you to plot base shear vs. monitored displacement as well as other plots.
* Display > Show Hinge Results enables you to plot the deformation of the hinges vs. the applied loads, such as plastic rotation of the hinge vs. moment.
* Use Display > Show Deformed Shape menu command to review displaced shape and a sequence of hinge formation on a step-by-step basis.
* Review member forces on a step-by-step basis using Display > Show Forces/Stresses > Frames/Cables menu command.
* Use Display > Show Plot Functions to plot various outputs (such as joint displacements, frame member forces) at each step of the pushover analysis.
h1. See Also
* {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} [_Analysis Reference Manual_|doc:CSI Analysis Reference Manual] (Nonlinear Static Analysis > Static Pushover Analysis, page 394)
* Ashraf Habibullah and Stephen Pyle: Practical Three Dimensional Nonlinear Static Pushover Analysis, Structure Magazine, Winter 1998 ( available for download from [http://www.csiberkeley.com/support/technical-papers] )
* Static Pushover Analysis Watch & Learn video available from [http://www.csiberkeley.com/sap2000/watch-and-learn]| Info |
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This tutorial was initially written for SAP2000, though the general procedure also applies to CSiBridge. |
On this page:
An overview of the procedure for pushover analysis is given as follows:
Create the computational model
Create the computational model, without pushover data, using conventional modeling techniques.
Define properties for pushover hinges using Define > Section Properties > Hinge Properties. Hinges may be defined manually or by using one of several default specifications which are available.
Assign the pushover hinges to selected frame objects using Assign > Frame > Hinges.
Select Define > Load Patterns to define load patterns which will contain the loads applied during pushover analysis.
Define a nonlinear static load case
Select Define > Load Cases > Add New Load Case to define a nonlinear static Load case which will apply the previously-defined load pattern. This load case may be force-controlled (pushed to a specified force level) or displacement-controlled (pushed to a specified displacement).
Select Other Parameters > Results Saved to Multiple States such that various parameters may be plotted for each increment of applied loading.
Run the analysis
Select Analyze > Run Analysis to run the static-pushover analysis.
Review results
To plot base shear vs. monitored displacement, select Display > Show Static Pushover Curve. Additional variables are also available for plotting.
To plot hinge deformation vs. applied loading, select Display > Show Hinge Results. Moment as a function of plastic rotation is one such option.
To review displacement and the step-by-step sequence of hinge formation, select Display > Show Deformed Shape.
To review member forces on a step-by-step basis, select Display > Show Forces/Stresses > Frames/Cables.
Select Display > Show Plot Functions to plot response at each step of the pushover analysis, including joint displacement, frame member forces, etc.
See Also
CSI Analysis Reference Manual (Nonlinear Static Analysis > Static Pushover Analysis, page 394)
Habibullah, A., Pyle, S. (1998). Practical Three Dimensional Nonlinear Static Pushover Analysis , Computers and Structures, Inc., Berkeley, CA
CSI Watch & Learn video series, SAP2000 Tutorial 21, Static Pushover Analysis
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