波浪与地震荷载共同作用下桩的动力响应  

Dynamic Response of Pile at Waterwave Load and Seismic Load

作　　者：刘晨晨 张琪[1] 李明广[1] 周香莲[1] 黎蔚杰 LIU Chenchen;ZHANG Qi;LI Mingguang;ZHOU Xianglian;LI Weijie(State Key Laboratory of Ocean Engineering,Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,土木工程系,上海200240

出　　处：《上海交通大学学报》2021年第6期638-644,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(41572243,41727802)资助项目。

摘　　要：海洋风机单桩基础会受到波浪荷载的循环作用,同时会面临地震荷载的威胁,因此,海洋单桩基础所处的环境较为复杂.然而,目前大多理论研究主要考虑波浪荷载或地震荷载作用下的桩基动力响应问题.本文采用有限元方法建立了波浪-地震-桩-海床耦合模型,数值分析方法基于Abaqus隐式动力分析.采用Morison方程模拟波浪对于桩基础的作用,海床采用Mohr-Coulomb弹塑性模型,桩为弹性介质,地震波通过加速度的形式添加在模型底部.主要研究埋置在海床中桩的动力响应问题,如:加速度、位移、弯矩以及剪力等.结果表明:地震荷载对于海上风机单桩基础具有重要影响.在地震荷载作用下,桩的加速度以及位移响应均有一定程度的放大.土体性质以及桩的参数对于海上风机单桩基础设计至关重要.The pile foundation of offshore wind turbines is not only subjected to the cyclic action of wave load,but also the threat of seismic load.Therefore,the environment of pile in the ocean is complex.However,most theoretical investigations have often focused on the seabed response at water wave load or seismic load respectively.In this paper,a wave-seismic-pile-seabed coupling model is constructed by using the finite element method.The numerical analysis is based on the implicit dynamic analysis in Abaqus.Morison’s equations are used to simulate the effect of water wave on pile foundation.The Mohr-Coulomb model is adopted to simulate the seabed while the pile is considered as an elastic medium.The earthquake is applied on the bottom of the model as acceleration.The dynamic response of the pile embedded in seabed are studied,such as acceleration,displacement,shear force,and bending moment.The results show that seismic load has an important influence on the single pile foundation of offshore wind turbine.Under the action of earthquake load,the acceleration and displacement response of the pile are amplified to a certain extent.The properties of the soil and the parameters of the pile are crucial to the design of the single pile foundation for offshore wind turbines.

关 键 词：单桩 波浪荷载 地震荷载 Morison方程 动力响应 

分 类 号：TU42[建筑科学—岩土工程]