Improved evaluation method for seismic resilience of continuous beam bridges based on system vulnerability
In order to study the seismic resilience of continuous beam bridges,a finite element model was established based on OpenSees software.Firstly,the seismic response was obtained by incremental dynamic analysis(IDA)method,and the bridge system vulnerability was calculated by combing the damage judgment and the first-order boundary method.The failure probability was obtained from the vulnerability of the system,and based on the function loss the residual function of the bridge after earthquake was calculated.Then,a large number of samples were taken based on the distribution of repair time,the statistical results were fitted with normal distribution,and the mean value was selected to analyze the uncertainty of repair time.Finally,the resilience results of the traditional repair function were modified by failure probability,and an improved resilience evaluation method was proposed.The results show that the fitting effect of repair time samples is good,the variance R2 is greater than 0.95,and the selected mean value is representative.The improved seismic resilience evaluation results of the proposed method belong to the reasonable range,and the method considers the influence of the change of ground motion intensity on the bridge failure state,and overcomes the limitation of the application range of the three traditional repair functions.When the bridge is subjected to an earthquake with an intensity of 0.3g,its seismic resilience is 0.68,indicating that its resilience is in a medium state and meets the requirements of 8-degree fortification,which verifies the applicability of this method.The results can provide a reference for seismic resilience evaluation of continuous beam bridges.
continuous girder bridgevulnerability of systemnormal distributionrepair timeseismic resilience evaluation
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