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| 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 |
| 1.School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China; 2.China Railway 24th Bureau Group Fujian Railway Construction Co., Ltd., Fuzhou 350013, China |
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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.
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Received: 22 September 2022
Published: 28 December 2023
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