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在深水桥墩及桩基础等结构地震反应中,地震激励下的水流动水压力对水中结构的作用以及结构位形变化对水体的反作用,属于典型的流固强界面耦合问题。以一顶端伸出水面的圆柱式结构为研究对象,基于任意拉格朗日-欧拉描述的Navier-stokes方程,建立了考虑水流-结构强耦合效应的水流-结构三维有限元模型。以正弦位移波输入,考察结构材料模量、水流流速和水位、激振频率和位移幅值等多种因素,分析了结构表面作用的动水压力反应特征以及水流动力效应,探讨了水流动力效应的主要影响因素。结果表明:考虑流固强耦合作用时,结构表面作用的动水压力及其分布具有强烈的频率依赖性,高频激励可显著增强动水压力作用;由于结构周围流体具有一定的粘滞性及动载作用下具有较强的辐射阻尼效应,水流动力效应对结构的位移、内力反应均有一定的抑制作用;激振频率、水流流速和水位以及结构材料模量等因素,对水流动力效应均有一定的影响。
In seismic response of structures such as deep-water bridge piers and pile foundations, the effect of water flow pressure under seismic excitation on water structure and the reaction of structural deformation to water body are typical coupling problems of fluid-solid interface. Based on the Navier-Stokes equations described by arbitrary Lagrange-Euler, a three-dimensional water flow-structure finite element model considering water-structure strong coupling effect is established. With the input of sine displacement wave, the factors such as structural material modulus, flow velocity and water level, excitation frequency and displacement amplitude were investigated. The hydrodynamic pressure response and the hydrodynamic effect on the surface of the structure were analyzed. The hydrodynamic effect The main factors. The results show that hydrodynamic pressure and its distribution on the surface of the structure have a strong frequency dependence when considering the strong coupling between fluid and solid. The high frequency excitation can significantly enhance hydrodynamic pressure. Due to the viscosity of the fluid around the structure and Under the action of dynamic load, it has a strong radiation damping effect. The hydrodynamic effect has a certain inhibitory effect on the displacement and internal force response of the structure. The excitation frequency, the flow velocity and the water level of the water flow, Have a certain impact.