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[GEN/Pushover]Should Reinforcement Be Done When Rebar Is NG in Linear Analysis Design But Satisfactory in Pushover?

Question

I'm evaluating seismic performance through pushover analysis. The model had N.G. in some columns in the linear analysis.
After the pushover analysis, I reviewed the plastic hinge distribution status at the performance points and found that, unlike the linear analysis results, the hinge distribution status is good in almost all columns, not exceeding the maximum capacity of the capacity curve.

In this case, I am wondering if I should reinforce the hinge because the linear analysis result shows N.G., or if the nonlinear analysis result is good and seismic reinforcement is not required.

Also, how does the N.G. in the linear analysis relate to the hinge distribution in the pushover analysis?

 

Answer

The N.G. generated by some columns in the linear analysis result is for the nominal internal force of the section (member) according to the elastic analysis result, so it is not related to the member strength of the inelastic analysis result.

 

Therefore, if the hinge distribution state at the performance points in Pushover analysis does not exceed the target performance level based on the internal force curve, you should first check what state was set as the target performance level in terms of nominal internal force. It's essential to verify how you have defined the target performance level.


You should start by assessing whether the chosen target performance level is appropriate or not. Once you have established the target performance level, you can determine whether retrofitting is necessary or not. Keep in mind that the performance levels in elastic (linear) analysis and nonlinear analysis are separate concepts. While you can compare the values of element performance between the two analysis methods, there is no direct correlation between them.

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