Dynamic response limit of high-speed railway bridge under earthquake considering running safety performance of train

考虑列车行车安全性能的地震下高速铁路桥梁动力响应限值

Due to the wide railway network and different characteristics of many earthquake zones in China,considering the running safety performance of trains(RSPT)in the design of high-speed railway bridge structures is very necessary.In this study,in order to provide the seismic design and evaluation measure of the bridge structure based on the RSPT,a calculation model of RSPT on bridge under earthquake was established,and the track surface response measure when the derailment coefficient reaches the limit value was calculated by referring to 15 commonly used ground motion(GM)intensity measures.Based on the coefficient of variation of the limit value obtained from multiple GM samples,the optimal measures were selected.Finally,the limit value of bridge seismic response based on RSPT with different train speeds and structural periods was determined.

由于我国铁路网广、地震带多等特点,在高速铁路桥梁结构设计中,考虑列车运行安全性能是十分必要的。为了提供基于桥上高速列车行车安全性能的桥梁结构抗震设计和评估方法,本文建立了地震作用下桥上高速列车行车安全的计算模型,参考15种常用的地震动强度指标计算脱轨系数达到极限值时的轨面响应指标。根据多个地震动样本得到指标极限值的变异系数,并选择最优指标。最后,根据所选的最优指标确定了不同列车速度、不同结构周期下基于列车行车安全性能的桥梁地震响应指标极限值。