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浙江大学学报(工学版)
浙江大学学报(工学版)
土木工程     
自由振动时带承台单桩的纵向动力特性
王奎华1,陈鑫1,吕述晖1,吴文兵2,李振亚1
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
Vertical dynamic characteristics of single pile with cushion cap undergoing free vibration
WANG Kui-hua1, CHEN Xin1, LV Shu-hui1, WU Wen-bing2, LI Zhen-ya1
1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2.Engineering Faculty, China University of Geosciences, Wuhan 430074, China
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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.
关键词： 承台;  广义Voigt模型;  桩顶阻抗;  自由振动;  Laplace变换    
Abstract:

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 calculated 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 transformation 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．
Key words: general Voigt model    pile top impedance    free vibration    cushion cap    Laplace transform
出版日期: 2014-09-30
:  TU 473  
基金资助:

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）
作者简介: 王奎华(1965-)，男，教授，博导，从事桩基动力学理论及土工测试方法研究. E-mail: zdwkh0618@zju.edu.cn
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引用本文:

王奎华,陈鑫,吕述晖,吴文兵,李振亚. 自由振动时带承台单桩的纵向动力特性[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2014.09.008.

WANG Kui-hua, CHEN Xin, LV Shu-hui, WU Wen-bing, LI Zhen-ya. Vertical dynamic characteristics of single pile with cushion cap undergoing free vibration. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2014.09.008.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2014.09.008    或    http://www.zjujournals.com/xueshu/eng/CN/Y2014/V48/I9/1595

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