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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。
It is necessary to carry out the research work on the safety assessment of multi-span viaducts under earthquake operation due to earthquake-caused high-speed train passing through the bridge in high seismic intensity area. The relation between wheel-rail contact area and derailment coefficient is put forward, and the train-viaduct model under the action of earthquake load is established by the fine wheel-rail relation. Take an elevated railway viaduct as an example to evaluate the safety of the viaduct under earthquake operation. The results show that the operational safety indexes of the viaduct train are within the safe range. With the increase of the vehicle speed, the derailment coefficient and the load shedding rate increase continuously, and the traffic safety of the train gradually decreases.