Stochastic Analysis of Train Running Safety on Bridge with Earthquake-Induced Irregularity under Aftershock

As a type of urban life project in China, bridges need certain capacity trains running safely after an earthquake to ensure and guarantee transportation on railway lines, post-disaster reconstruction relief work. Since aftershocks may occur the main shock, earthquake-induced irregularity aftershock intensity are fully considered, based safety index seismic design bridges. However, there is lack research earthquake; it mainly judged experience, lacks theoretical basis. In this paper, established finite element model train bridge interaction system with symmetry was considered. The point estimation method (PEM) combined moment expansion approximation (MEA) used for random calculation Housner Intensity (HI). Furthermore, indexes were analyzed performance simply supported assessed under post-earthquake condition. Then limit value, traffic earthquake, calculated stochastic analysis. HI can be full consideration randomness structural parameters. On basis, that considers proposed. This study helpful performance-based symmetric structures conditions.