波浪-地震联合作用下高速铁路跨海斜拉桥车桥耦合振动研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (24) : 16-23.

论文

雷虎军1，林镇荣1，温家生2，邱官发2，陈希茂2

作者信息 +

Vehicle-bridge coupling vibration of high-speed railway sea-crossing cable-stayed bridge under combined wave-earthquake action

LEI Hujun1，LIN Zhenrong1，WEN Jiasheng2，QIU Guanfa2，CHEN Ximao2

Author information +

文章历史 +

摘要

高速铁路跨海桥梁会受到长期波浪力的作用，当地震偶然发生时还会受到地震和地震附加动水压力的作用，需研究波浪-地震联合作用的影响。基于线性波浪理论和Morsion方程模拟波浪力，采用附加质量法模拟地震附加动水压力，建立了波浪-地震联合作用下的列车-轨道-桥梁耦合振动模型。在此基础上，以某主跨400米的跨海斜拉桥为例，根据桥址处的波浪参数和地震动参数，系统研究了波浪-地震联合作用下跨海斜拉桥的车桥耦合振动问题。研究结果表明：对于高速铁路跨海斜拉桥，考虑地震附加动水压力会显著增大斜拉桥主梁跨中的横向动力响应及桥上列车的行车安全性指标；考虑波浪-地震联合作用时，桥梁的横向动力响应及列车的行车安全性指标均随波浪重现期的增大而增大；对于本文算例，单独地震作用下的安全车速阈值为250km/h，而一般波浪-地震联合作用和极端波浪-地震联合作用下在计算范围内无安全车速。本文的研究成果可为高速铁路跨海斜拉桥的设计提供技术支撑。

Abstract

The cross-sea bridge of high-speed railway will be affected by long-term wave force, and when an earthquake happens occasionally, it will also be affected by earthquake and earthquake additional hydrodynamic pressure, so it is necessary to study the influence of wave-earthquake combined action. Based on the linear wave theory and Morsion equation to simulate the wave force, the additional mass method is used to simulate the seismic additional hydrodynamic pressure, and the train-track-bridge coupling vibration model under the combined wave-earthquake action is established. On this basis, taking a sea-crossing cable-stayed bridge with a main span of 400 m as an example, according to the wave parameters and ground motion parameters at the bridge site, the vehicle-bridge coupling vibration of the cross-sea cable-stayed bridge under the combined wave-earthquake action is studied systematically. The research results show that for the high-speed railway cross-sea cable-stayed bridge, considering the earthquake additional hydrodynamic pressure will significantly increase the lateral dynamic response of the main girder of the cable-stayed bridge and the safety index of the train on the bridge, and when considering the combined wave-earthquake action, the lateral dynamic response of the bridge and the safety index of the train increase with the increase of the wave recurrence period. For the example in this paper, the safe speed threshold under single earthquake is 250km/h, but there is no safe speed in the calculation range under general wave-earthquake combined action and extreme wave-earthquake combined action. The research results of this paper can provide technical support for the design of high-speed railway cross-sea cable-stayed bridge.

导出引用

雷虎军1，林镇荣1，温家生2，邱官发2，陈希茂2. 波浪-地震联合作用下高速铁路跨海斜拉桥车桥耦合振动研究[J]. 振动与冲击, 2023, 42(24): 16-23

LEI Hujun1，LIN Zhenrong1，WEN Jiasheng2，QIU Guanfa2，CHEN Ximao2. Vehicle-bridge coupling vibration of high-speed railway sea-crossing cable-stayed bridge under combined wave-earthquake action[J]. Journal of Vibration and Shock, 2023, 42(24): 16-23

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