自由振动时带承台单桩的纵向动力特性  

Vertical dynamic characteristics of single pile with cushion cap undergoing free vibration

作　　者：王奎华[1] 陈鑫[1] 吕述晖[1] 吴文兵[2] 李振亚[1] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]中国地质大学工程学院,湖北武汉430074

出　　处：《浙江大学学报（工学版）》2014年第9期1595-1602,共8页Journal of Zhejiang University：Engineering Science

基　　金：中国博士后科学基金面上项目(2012M521495);中央高校基本科研业务费专项资金资助项目(CUG120821)

摘　　要：基于广义Voigt模型,在考虑桩身材料阻尼情况下,研究带承台单桩的竖向自由振动问题.根据阻抗传递法推出桩顶阻抗,将所求得的桩顶阻抗作为支承刚度代入承台的自由振动微分方程中,运用Laplace变换及逆变换推导得到承台自由振动位移在时域范围内的半解析解.采用参数研究方法,分析桩径、桩长、桩身材料阻尼以及不同性质的桩侧土层对带明置承台单桩自由振动特性的影响;将所得解与工程实测曲线进行对比,结果表明:得到的理论计算结果与工程实测数据较接近,理论方法能够反映工程实际.Based on generalized Voigt model, the vertical free vibration of single pile with cushion cap was theoretically investigated by considering the viscosity of pile material. First, pile top the impedance is cal- culated according to the impedance transformation principle. Then, substituting the top impedance which serves as the supporting rigidity into the dynamic equilibrium equation of free vibration cushion cap, a semi-analytical solution for time-domain displacement curve can be obtained by using Laplace transforma- tion and inverse transformation methods. Parametric study method was adopted to study the effects of pile diameter, length, material viscosity and different soil types on the free vibration characteristic of pile with exposed cushion cap. Finally, a comparison between the theoretical curve and the measurement values is conducted. The results of the present approach and the engineering Practice show good agreement.

关 键 词：广义Voigt模型 承台 自由振动 桩顶阻抗 LAPLACE变换 

分 类 号：TU473[建筑科学—结构工程]