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.
- 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.