波流场中的桩柱结构地震反应研究

采用理论分析及有限元模拟的方法, 对波流场中桩柱结构的地震动力反应进行了研究. 除考虑波流场作用在桩柱上的波流力和动水压力外, 根据模型试验结果认为还需考虑作用在 桩柱上的涡振横向力. 通过地震作用下波流场中四桩平台的有限元模拟计算, 发现 水中地 震放大了桩柱结构的动力反应; 波流力和涡振横向力共同作用导致桩的相对位移、剪力及弯 矩值大幅提高, 但是对桩身加速度影响较小; 桩底部位易于发生地震破坏.

THE SEISMIC RESPONSE OF PILES IN WAVE-CURRENT FIELD

The seismic responses of the piles in a wave-current field are studied by theoretical analysis and finite element simulation. Besides the wave-current force and hydrodynamic pressure on the piles in the wave-current field, the results of the model test show that the vortex-induced lateral force should also be considered. The finite element simulation of a platform with four piles in the wave-current field under seismic action is carried out. It is shown that the seismic responses of the piles are magnified by water. Except for the acceleration along piles, the relative displacement and shear force and moment are increased significantly under the combined action of the wave-current force and the vortex-induced lateral force. And it is also indicated that the failure at the bottom of piles occurs easily under the seismic action.