Pushover analysis first steps


Guidelines for performing pushover analysis.





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This tutorial was initially written for SAP2000, though the general procedure also applies to CSiBridge.

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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