单桩水平动力阻抗计算模型研究  

Study on computational model of lateral dynamic impedance of single pile

作　　者：孔德森[1] 栾茂田[2] 凌贤长[1] 杜政 

机构地区：[1]哈尔滨工业大学土木工程学院 [2]大连理工大学土木水利学院,辽宁大连116024 [3]滕州市建兴基础工程有限责任公司,山东滕州277500

出　　处：《哈尔滨工业大学学报》2007年第8期1220-1224,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50378031);中国博士后科学基金资助项目(2006039080620060400241);山东科技大学科学发展基金资助项目(05g002)

摘　　要：运用土动力学和结构动力学原理,同时考虑地基土的成层非均质性、桩土界面的相对脱离效应和桩侧土的弱化效应,采用数理方程方法分别求解桩与土的振动方程,建立了水平荷载作用下单桩动力阻抗函数的计算方法,同时提出了一种改进的非线性动力W inkler计算模型,确定了模型中各物理元件的参数,通过对比分析验证了计算模型的合理性,从而为桩-土-上部结构耦合系统的非线性分析奠定了基础.A simplified mechanical model for computing the lateral dynamic impedance function of single pile in layered soils is established based on a certain assumptions and the improved dynamic model of beam - on - Winkler foundation by using the principle of soil dynamics and structural dynamics. Both non - homogeneity of soil strata and softening effect of soil layers around pile during vibration together with relative separation of pile - soil interface are simultaneously taken into account. The characteristics of the frequency - dependency of lateral dynamic stiffness and damping of pile are reproduced. It is shown through the comparative study on an example that the numerical results of dynamic impedance of pile computed by the proposed dynamic Winkler model are relatively rational. All these provide the base for the nonlinear analysis of dynamic pile - soil - structure interaction system.

关 键 词：桩基 水平动力阻抗 相对脱离 桩-土动力相互作用 

分 类 号：TU435[建筑科学—岩土工程]