Abstract：Based on the idea of large system, the vehicle-bridge-wind-wave-current coupling dynamic system was established, including a vehicle subsystem, a bridge subsystem and a wind-wave-current coupling field subsystem. An analysis framework of the vehicle-bridge-wind-wave-current coupling dynamic system was proposed. Within this framework, the motion equation of the coupling system was established, based on the interaction forces of three subsystems as well as the displacement compatibility relationship between vehicle subsystem and bridge subsystem, and furthermore, the solution process of dynamic response based on the separation iterative method was proposed. A rail-cum-road cable-stayed sea bridge scheme was studied, and the research results show that the wind-wave-current coupling action can excite the vehicle, girder, pylon and underwater foundation concurrently. Compared to the single wind action, the wind-wave-current coupling action can cause more acute lateral and torsional response of bridge and worsen the train safety in operation. The root-mean-square of lateral displacement, lateral acceleration, torsional displacement and torsional acceleration increase 0.8%, 23.1%, 4.9% and 0.5% for the girder at the mid-span of main span, respectively, and increase 204.9%, 167.0%, 198.7% and 314.7% for the girder at the side tower, respectively; The car-body acceleration, the wheel/rail lateral force and wheel unloading rate of vehicle increase 60.9%, 7.2% and 6.6%, respectively. Therefore, it is necessary to consider the wind-wave-current coupling action for the rail-cum-road sea bridge, andconsidering the single wind action may overestimate the safety of the bridge and the vehicle in operation.
刘高 陈上有 王昆鹏 许会燕. 跨海公铁两用桥梁车-桥-风浪流耦合振动研究[J]. 土木工程学报, 2019, 52(4): 72-87.
Liu Gao Chen Shangyou Wang Kunpeng Xu Huiyan. Study on coupling vibration of vehicle-bridge-wind-wave-current system of rail-cum-road sea bridge. 土木工程学报, 2019, 52(4): 72-87.
