Fluid-structure interaction characteristics of superstructure of a cross-sea box bridge under extreme wave action

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 210-219.

HUANG Bo1, TANG Yao1, YANG Zhiying2, ZHU Bing2, QU Jianqiang3

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Abstract

Coastal bridges face great threats from extreme waves in the ocean environment, and the wave-structure interaction is a key problem need to be solved in the design of the box-girder superstructure when subjected to extreme wave actions. In this paper, the OpenFOAM program and the Finite volume method were used to discretize the Naiver-Stokes equation for modeling incompressible fluid, and combined with the SST k-ω turbulence model to simulate the generation, propagation and impact of extreme waves. In addition, a spring-mass-damping system was used to simulate the motion system of the box-girder superstructure, and a multiphase coupling model between extreme waves and the box-girder superstructure was established based on the dynamic grid method. The effectiveness of the coupling model was verified by comparing with the flume test results of the wave-structure interaction model and the simulation results of existing literatures. Then, the effects of wave parameters, structural characteristics and constraint stiffness on the wave forces, dynamic characteristics and bearing forces of the box-girder superstructure were investigated by using the coupling model. The results show that the coupling effect of the box-girder superstructure and waves causes the wave force to fluctuate and decrease, and the maximum horizontal wave force decreases by 28 % and the maximum vertical wave force decreases by 22.5 %. It is more reasonable to predict wave forces of the box-girder superstructure under extreme wave action through considering the fluid-structure interaction. With the increase of the structural natural vibration period, the constraint stiffness of horizontal spring decreases, which leads to the increase of horizontal displacements of the box-girder superstructure. In the support design of the coastal bridge superstructure, not only the wave force on the superstructure should be considered, but also the influence of the structural motion and the fluid-structure interaction on the bearing force should be considered.

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Coastal bridges / Extreme waves / Box-girder superstructure / Fluid-structure interaction / Numerical simulation

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HUANG Bo1, TANG Yao1, YANG Zhiying2, ZHU Bing2, QU Jianqiang3. Fluid-structure interaction characteristics of superstructure of a cross-sea box bridge under extreme wave action[J]. Journal of Vibration and Shock, 2023, 42(17): 210-219

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