轴对称均匀黏弹性地基中现浇薄壁管桩竖向动力响应简化解析方法  

Simplified analytical method of vertical dynamic response of cast-in-situ concrete thin-wall pipe piles in axisymmetric homogeneous viscoelastic soil

作　　者：丁选明[1,2] 刘汉龙[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098

出　　处：《岩土力学》2008年第12期3353-3359,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.50679017);江苏省"六大人才高峰"基金资助项目(No.50528512)

摘　　要：考虑土体材料的黏性阻尼和桩-土纵向耦合振动,建立了轴对称均匀黏弹性地基中现浇薄壁管桩管桩纵向振动的定解问题,采用Laplace变换的方法求得了解析解。对一算例进行了分析,将计算结果与实测波形和有限元进行了对比,三者吻合较好。进一步分析了桩周土和桩芯土黏性阻尼系数对桩顶速度导纳和复动刚度的影响以及桩底土阻尼系数对桩顶速度导纳的影响,得到了各参数对桩纵向振动特性影响的规律。Considering the viscous damping of the soil and soil-pile vertical coupled vibration, the differential equations and boundary conditions about vertical vibration of cast-in-situ concrete thin-wall pipe piles in axisymmetric homogeneous viscoelastic soil are established. The analytical solution is obtained by Laplace transformation method. A case study is given; and the results of analytical solution can well match FEM and measured waves. Moreover, by analyzing the effects of viscous damping coefficient on velocity admittance and complex dynamic stiffness, and the effect of damping coefficient of the soil below pile bottom on velocity admittance, the regularity of variations of vertical vibration characteristic with parameters is obtained.

关 键 词：现浇薄壁管桩 动力响应 解析解 动刚度 黏弹性地基 

分 类 号：TU473[建筑科学—结构工程]