波浪荷载作用下群桩筒基础动力响应研究

Research on Dynamic Response of Group Pile Tube Foundation under Wave Loads

基于波浪运动的基本概念,采用莫里森方程中小尺寸构件的波浪力的计算方法得出波浪力关于时间的曲线,将具有周期性变化的波浪荷载施加在群桩筒基础模型顶部一点,研究群桩筒基础在波浪荷载作用下的动力响应,结果表明:波浪荷载作用下,基础的应力集中区域出现在顶盖与过渡段、顶盖与钢管桩连接区域,钢管桩桩身应力值大小沿深度向下递减。钢管桩对荷载的传递起到了很好的分担效果,有效地分担了筒壁承载的压力;通过对比波浪荷载作用下基础顶部和基础泥面的位移峰值大小得出,群桩筒基础比单一的筒型基础具有更好的抵抗波浪荷载的能力,即筒内桩基可以有效分担上部荷载,在用钢量相同时,B1P的抵抗波浪荷载的性能最优。

Based on the basic concept of wave motion,the Morrison equation is used to calculate the wave force of small and medium-sized components,and the curve of wave force with respect to time is obtained.A periodically changing wave load is applied to the top of the group pile foundation model to study the dynamic response of the group pile foundation under wave loads.The results show that the stress concentration area of the foundation appears in the top cover and transition section under wave loads.In the connection area between the top cover and the steel pipe pile,the stress value of steel pipe pile body decreases downwards along the depth.The steel pipe pile has a good sharing effect on the transmission of load.By comparing the peak displacement values of the top of foundation and the soil surface under wave loads,it is found that group pile tube foundations have better resistance to wave loads than a single tube foundation,that is,the pile foundation inside the tube can effectively share the upper load.When the amount of steel used is the same,B1P has the best performance in resisting wave loads.