桩-土系统在波浪荷载下的动力响应分析

通过展开波浪对桩散射问题的特征函数的方法研究了波浪荷载作用下桩-土体-水流系统的动力响应问题.采用动力Winkler弹性地基梁模型模拟桩土动力的相互作用，通过求解满足柱面非齐次边界条件的Laplace方程，直接构造波浪对柔性桩的散射速度势，考虑了流体和桩体的相互作用，由解析法给出了埋置圆桩在波浪荷载下的动力响应.研究和分析了在波浪力作用下泥面冲刷深度、土参数、波浪入射频率对桩身内力、桩身振动响应的影响.在波浪荷载作用下，与先计算柔性悬臂端波浪力再考虑桩土间相互作用的情况相比，当考虑桩土耦合振动时，桩的水平振动的振幅减小，基频降低.

Dynamic response of pile-soil system due to wave force

The dynamic response of the embedded pile due to the wave force was studied by an analytical method of eigenfunction expansion. The scattering wave velocity potential to the flexible circle pile was the solution of the Laplace equation, which satisfied the cylindrical surface non-homogeneous boundary condition. The pile-soil interaction was assumed to be the elastic beam acting on the Winkler foundation. Numerical results were presented which showed the influences of some parameters such as the scour depth, soil modulus and the incident wave frequency on the dynamic response of the embedded pile. The amplitude and fundamental frequency of vibration of the pile were reduced considering the couple of the soil and the pile, compared with the process that the soil and pile iteraton was considered after the wave force on the flexible cantilever was calculated.