This paper explores the degradation law of reinforcement diameter and mechanical properties caused by chloride erosion based on the corrosion mechanism of pier reinforcement and considers the variability of ground motion and structural parameters.Due to the large amount of analysis and calcu-lation,Kriging model and Latin hypercube sampling(LHS)method are introduced to establish the vulnerability curve,and the method of Monte Carlo sampling is used to form the damage probability surface of the bridge system in the whole life cycle.OpenSEES program is used to establish finite ele-ment model for a long-span arch bridge,in which the time-varying effect is introduced.The analysis results show that Kriging model can accurately replace the finite element analysis,and can significant-ly reduce the calculation amount.For long-span arch bridges,it is more reasonable to evaluate the seismic performance of bridges by the vulnerability of the whole bridge system obtained by Monte Carlo sampling.During the life-cycle design reference period,the pier damage probability increases significantly with the increase of service time.The research can provide reference for the life-cycle seismic performance design of similar bridge structures.
long-span arch bridgeKriging modeltime-varying vulnerabilityMonte Carlo samplingsystem vulnerability
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