Question
The axial force due to the fixed load output in the seismic performance evaluation calculation does not match.
Answer
You can check the axial force due to the fixed load in the [Structure Analysis] sheet and [Bridge Seismic Performance Evaluation] sheet of the Excel calculation outputted by the seismic performance evaluation. However, there are some differences in the values, which are related to whether the Yield Effective Stiffness of the pier is applied or not.
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[Bridge Seismic Performance Evaluation] sheet |
[Structural Analysis] sheet |
In seismic performance evaluation, a moment-curvature curve is generated to obtain the retention performance of the bridge, and the yield effective stiffness obtained from the generated moment-curvature curve is applied to the bridge piers. The moment-curvature curve is generated with a fixed load applied, and the axial force generated on the bridge during the analysis is entered into the moment-curvature curve diagram.
In other words, the axial force entered in the moment-curvature curve plot of the [Seismic Performance Evaluation of Bridge] sheet is the axial force at full stiffness before the yield effective stiffness is applied. However, the axial force of the pier entered in the [Structural Analysis] sheet is the axial force with the yield effective stiffness applied, which is why the difference occurs.
If you want to compare results with and without the application of yield effective stiffness in Civil, you can perform the analysis in Section Manager with the Section Stiffness Scale Factor modified to 1 (full stiffness state).
[Properties] Tab > [Section] Group > Section Manager