摘要
运用土动力学和结构动力学原理,基于改进的Winkler地基梁模型,考虑了地基土的成层非均质性和桩土界面的相对分离效应以及桩侧土的弱化效应,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力学模型.通过数值计算将得到的单桩水平动力阻抗随激振频率的变化关系与现有的计算和试验结果进行了对比,验证了计算方法的合理性,进而通过变动参数计算得到了桩周弱化土域、桩土界面接触状态、桩身长细比和桩土刚度比等对单桩水平动力阻抗函数的影响规律.
A simplified mechanical model for computing the lateral dynamic impedance function of single pile in layered soils is established based on certain assumptions and the improved dynamic model of beam-on-Winkler foundation by using the principle of soil dynamics and structure 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. The comparative analysis on a numerical example shows that the numerical results of dynamic impedance of pile computed by the proposed method are relatively rational and can agree well with the computational and experimental results currently available. Finally the parametric studies are made for the varied range of the main parameters such as the softening zone of soils around pile, the contact conditions of pile-soil interface, the slenderness ratio of pile and the pile-soil stiffness ratio to discuss the effects of the relevant factors on dynamic impedance of pile in layered soils.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2004年第4期560-565,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(50179006)
教育部跨世纪优秀人才培养计划研究基金资助项目.
