摘要
考虑土体材料的黏性阻尼和桩-土体系的扭转耦合振动,研究了成层黏弹性地基中管桩的扭转振动问题.首先,采用分离变量法求解得到土体扭转振动位移形式解;然后利用阻抗函数传递方法,求解得到了成层地基中桩顶阻抗函数的解析解;最后通过数值算例分析了桩周土与桩芯土的物理力学参数、管桩壁厚以及桩端阻抗函数对管桩桩顶复刚度的影响.分析结果表明,在动力基础设计所关注的低频段,桩周土的剪切模量和黏性阻尼系数对桩顶复动刚度的影响要远大于桩芯土;桩端位移阻抗函数的选取对桩顶复刚度有明显的影响.
Considering the viscous damping of the soils and the soil-pile coupled vibration,the response of a pipe pile embedded in a layered visco-elastic soil and subjected to a harmonica torsional loading is theoretically investigated. The vibration displacement solution of the soils is solved by using the separation of variables technique at first. Based on perfect contact between the pipe pile and the soils and through the recursion of the impedance function,the analytical solution for the dynamic response of the pile top is derived in the frequency domain. Finally,the corresponding computer programs are developed and parameter study is made to investigate the torsional vibration characteristics of pipe pile. It is shown that,in the low-frequency stage which focused by dynamic foundation design,the influence of the shear modulus and viscosity damping coefficient of soil around pile is greater than the influence of inner soil. The determination of impedance function at pile bottom has significant affection on the complex stiffness of pile top.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2015年第4期782-791,共10页
Journal of Basic Science and Engineering
基金
国家自然科学基金资助项目(51378464)
浙江省"十二五"重点学科建设项目资助
浙江省自然科学基金资助项目(LY12D02001)
关键词
管桩
成层黏弹性地基
桩土相互作用
扭转振动
桩顶复刚度
pipe pile
layered visco-elastic soil
pile-soil interaction
torsional vibration
complex stiffness at pile top
