海洋高桩基础水平振动特性分析  

Horizontal vibration characteristics of offshore elevated piles

作　　者：付鹏 胡安峰[1,2] 李怡君[1,2] 谢康和[1,2] 李龙[1,2] FU Peng;HU Anfeng;LI Yijun;XIE Kanghe;LI Long(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;MOE Key Lab of Soft Soils and Geo-environmental Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058

出　　处：《振动与冲击》2019年第17期88-94,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51778572)

摘　　要：考虑动水压力作用和桩-流体耦合振动,对黏弹性地基中海洋高桩基础水平振动问题进行了理论研究。首先采用分离变量法求解流体运动方程,得到了动水压力解析表达式。进而考虑桩-土体及桩-流体耦合条件、桩身内力和位移连续条件,基于传递矩阵法,得到了水平简谐荷载作用下海洋高桩基础桩顶阻抗解析表达式。将该解分别退化为水中圆柱梁振动问题及完全埋入式桩水平振动问题,与已有解进行对比,验证了该解的合理性。并与不考虑动水压力的计算结果对比分析,结果表明忽略动水压力会高估高桩基础桩顶水平动刚度。Here,considering hydrodynamic pressure action and pile-fluid coupled vibration,the horizontal vibration problem of an offshore elevated pile in viscoelastic foundation was investigated theoretically.The governing equation of fluid motion was solved with the separation variable method,and the analytical expression for hydrodynamic pressure was obtained.Considering pile-soil body coupled condition and pile-fluid one as well as continuity conditions of pile’s internal force and displacement,based on the transfer matrix method,the analytical expression for dynamic impedance at an offshore elevated pile’s top was solved under action of a horizontal simple harmonic load.The problem studied here was degenerated into the vibration problem of a cylinder beam in water and the horizontal vibration problem of a fully embedded pile,and then the gained solutions were compared with the existing ones published in literature to verify the rationality of the solution obtained here.The calculation results here were compared to those without considering hydrodynamic pressure,it was shown that neglecting hydrodynamic pressure can overestimate the horizontal dynamic impedance at an offshore elevated pile’s top.

关 键 词：海洋高桩 水平振动 动水压力 传递矩阵法 

分 类 号：TU473.1[建筑科学—结构工程]