基于行车阻断空间相关性的高速铁路桥梁网络震后通行能力分析

Considering two types of disaster scenarios on high-speed railway bridge system will form blocking effect, (1)damage to the bridge structure under rare earthquakes; (2)derailment of the bridge vehicle under frequent and occasional earthquakes. In order to avoid the dynamic analysis of the complex earthquake-vehicle-bridge coupling system one by one for a large number of bridges, the project will establish the spatial correlation analysis model of the vehicle dynamic response to consider the difference of the seismic response of the different bridges within the small area of the earthquake-related correlation, and propose a H-Vanmark improved model with time-varying characteristics to consider the incomplete time domain effect of the train over bridges compared to seismic duration. A multi-objective optimization model based on niche Pareto genetic algorithm is established to solve the spatial correlation length of vehicle response and determine the number of PSHA reference response points for different source impacts and probability of occurrence. In addition, combined with the influence of near-field pulsed ground motion, and the calculation of network performance based on the shortest path and flow analysis, the project provides the theory of vulnerability analysis of bridge network with seismic hazard-bridge passing-network connectivity and to explain the mechanism of seismic correlation to the evolution of vehicle dynamics.

考虑到两类灾害情景对高速铁路桥梁网络系统都会形成的阻滞作用，(1)在罕遇地震作用下桥梁结构破坏；(2)在频遇和偶遇地震作用下桥上车辆脱轨 ，为了避免在对数量众多的桥梁逐一进行复杂的“地震－车－桥”耦合系统动力学分析，项目将建立车辆动力响应的空间相关性分析模型，以考虑存在地震动相关性的小区域范围内，不同的桥上列车地震响应的差异，提出具有时变特征的H-Vanmark改进模型，以便考虑列车过桥相比地震持时的非完整时域效应；针对不同的震源影响及发震概率，建立基于小生境Pareto遗传算法的多目标优化模型，以便求解车辆响应的空间相关长度，并确定PSHA基准响应点的数量。另外，结合近场脉冲型地震动影响，并基于最短路径和流量分析的网络性能计算，最终提供以 “地震危险性－桥梁可通过性－网络连通性”为框架的桥梁网络易损性分析理论依据，并诠释地震相关性向车辆动力学行为演变的机理问题。

考虑到两类灾害情景对高速铁路桥梁网络系统都会形成的阻滞作用，(1)在罕遇地震作用下桥梁结构破坏；(2)在频遇和偶遇地震作用下桥上车辆脱轨 ，为了避免在对数量众多的桥梁逐一进行复杂的“地震－车－桥”耦合系统动力学分析，项目将建立车辆动力响应的空间相关性分析模型，以考虑存在地震动相关性的小区域范围内，不同的桥上列车地震响应的差异，提出具有时变特征的H-Vanmark改进模型，以便考虑列车过桥相比地震持时的非完整时域效应；针对不同的震源影响及发震概率，建立了基于小生境Pareto遗传算法的多目标优化模型，以便求解车辆响应的空间相关长度，并确定PSHA基准响应点的数量。另外，结合近场脉冲型地震动影响，并基于最短路径和流量分析的网络性能计算，最终提供以 “地震危险性－桥梁可通过性－网络连通性”为框架的桥梁网络易损性分析理论依据，并诠释地震相关性向车辆动力学行为演变的机理问题。