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  

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

作　　者：雷虎军 林镇荣 温家生 邱官发 陈希茂 LEI Hujun;LIN Zhenrong;WEN Jiasheng;QIU Guanfa;CHEN Ximao(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;China Railway 24th Bureau Group Fujian Railway Construction Co.,Ltd.,Fuzhou 350013,China)

机构地区：[1]福建理工大学土木工程学院,福州350118 [2]中铁二十四局集团福建铁路建设有限公司,福州350013

出　　处：《振动与冲击》2023年第24期16-23,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51878173);福建省自然科学基金(2020J01883)。

摘　　要：高速铁路跨海桥梁长期受到波浪力的作用,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 m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;当考虑波浪-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;根据算例,单独地震作用下的安全车速阈值为250 km/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。该研究成果可为高速铁路跨海斜拉桥的设计提供技术支撑。The cross-sea bridge of a 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 its additional hydrodynamic pressure,so it is necessary to study the influence of wave-earthquake combined action.Based on the linear wave theory and the Morsion equation to simulate the wave force,the additional mass method was used to simulate the seismic additional hydrodynamic pressure,and the train-track-bridge coupling vibration model under the combined wave-earthquake action was 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 was studied systematically.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.When the combined wave-earthquake action is considered,the lateral dynamic response of the bridge and the safety index of the train increases with wave recurrence period.For the example in this paper,the safe speed threshold under single earthquake is 250 km/h,but there is no safe speed in the calculation range under general wave-earthquake combined action and extreme wave-earthquake combined action.The results of this paper can provide technical support for the design of high-speed railway cross-sea cable-stayed bridges.

关 键 词：车桥耦合振动 地震作用 波浪力 动水力 行车安全性 

分 类 号：U24[交通运输工程—道路与铁道工程] TB123[理学—工程力学]