Static Pushover Graph [SIG]
General
Pushover Case: Select the pushover analysis case that you want to evaluate. This case contains the nonlinear static analysis results where lateral loads are incrementally applied to push the structure to its capacity limits. The pushover curve (base shear vs. displacement) is generated from this analysis.
RSA Case: Select the Response Spectrum Analysis (RSA) case to compare with the pushover results. The RSA case provides the elastic displacement demand from seismic loading. By overlaying the RSA displacement on the pushover curve, you can verify whether the structure has sufficient capacity to meet the seismic demand.
Advanced
Result Coord. System [Alignment/Global]: This parameter defines the coordinate system used to report the pushover analysis results and RSA displacements. You can choose between two options:
Alignment: Results are reported in the bridge alignment coordinate system. In this system, the longitudinal direction follows the bridge centerline alignment, the transverse direction is perpendicular to the alignment, and the vertical direction is based on the alignment's vertical profile. This is typically the preferred option for bridge analysis as it aligns with how engineers think about bridge loading directions (longitudinal vs. transverse).
Global: Results are reported in the global Cartesian coordinate system (X, Y, Z). This option uses the absolute global coordinates without any rotation based on alignment geometry.
Run for Pushover Graph Only (Ignore RSA Case) [No/Yes]: This parameter allows you to generate the pushover curve without comparing it to RSA results. You can choose between:
No: Both the pushover curve and RSA displacement comparison are generated. This is the default behavior where the RSA displacement demand is overlaid on the pushover capacity curve for seismic performance evaluation.
Yes: Only the pushover curve is generated, and the RSA case is ignored. Use this option when you only want to visualize the pushover capacity curve without performing a demand-capacity comparison. When this option is selected, the RSA Case parameter is not required.
An example report output is displayed below.
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