地震作用下多跨高架桥列车运行安全评估研究  

Safety evaluation of train crossing a multi-span elevated bridge under seismic excitation

作　　者：陈波[1] 杨登[1] 肖祥[2] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室 [2]武汉理工大学交通学院

出　　处：《中国安全科学学报》2016年第10期82-87,共6页China Safety Science Journal

基　　金：湖北省杰出青年基金资助(2014CFA026);国家自然科学基金资助(51178366);武汉理工大学自主创新基金资助(2014-IV-113)

摘　　要：高铁列车通过高烈度地震区域的桥梁时易遭受地震袭击而导致行车危险,因此,有必要开展地震作用下多跨高架桥列车运行安全评估的研究工作。提出轮轨接触区域与脱轨系数的关系式,采用精细的轮轨关系式建立地震荷载作用下列车-高架桥系统模型。以某高铁专线高架桥为实例,评估地震作用下的该高架桥列车运行安全性。结果表明,该高架桥列车运行安全性指标在安全范围之内;随着车速的提高,脱轨系数和减载率不断增加,列车行车安全性逐渐降低。A high speed train is in a dangerous state when crossing a bridge under earthquake attack. Therefore, it is essential to conduct the research on earthquake-induced safety evaluation of the train running on a multispan elevated bridge. A formula was developed for the relationship between the wheel-rail contact area and the derailment coefficient. An analytical model was built for the train-viaduct coupled system under earthquake based on the precise wheel-rail relationship. A real viaduct constructed in China was taken as an example to carry out the safety assessment of the train running on the multi-span elevated bridge under seismic excitation. The observations indicate that the train index is within the range of safety, and that both the derailment coefficient and unloading ratio gradually increase with the increase in train velocity and the train safety will reduce.

关 键 词：地震激励 高架桥 列车运行安全性 车桥耦合系统 安全评估 

分 类 号：X913.4[环境科学与工程—安全科学]