Bridge fragility analysis based on an improved uniform design-response surface methodology

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (22) : 245-254.

LI Huihui1 LI Lifeng1, 2

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Abstract

The effects of multi-correlation among design variables in the traditional uniform design-response surface methodology and correlations among structural random variables on seismic fragility analysis were studied.Introducing the Nataf transformation and combining it with the uniform design-response surface methodology based on spline transformation, an alternative method for bridge seismic fragility analysis was proposed.A multi-span reinforced concrete continuous girder bridge was taken as a case-study, its finite element model was built by using the OpenSees software and a nonlinear time-history analysis was conducted.In the study, the damages of pier, lead rubber bearing (LRB), plate-type elastomeric bearing (PETB) and abutment were taken into account.Then, the traditional uniform design-response surface methodology and the improved one were applied to analyze the seismic fragility of the case-study bridge and their results were compared.It is concluded that the response surface established by the improved methodology can better fit the structure's surface limit state function.By using the improved methodology, the failure probability of bridge components and bridge system under different damage states has a certain degree of reduction.The seismic capacity of the bridge tends to be underestimated by neglecting the correlations among structural random variables and using the conventional uniform design-response surface methodology in seismic fragility analysis.

Key words

bridge engineering / ground motions / seismic fragility analysis / uniform design response surface methodology / multi-correlation / Nataf transformation / correlations of random variables

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LI Huihui1 LI Lifeng1, 2 . Bridge fragility analysis based on an improved uniform design-response surface methodology[J]. Journal of Vibration and Shock, 2018, 37(22): 245-254

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