桩基高层结构体系地震响应的整体分析方法
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摘要
本文从结构整体性观点出发，以上部结构为主导并引入带多桩台的壁式框架模型，对拉身－土体系综合引用桩顶阻抗理论和方法来考虑群桩动效应，提出可考虑多个桩台的不同摇摆效应的桩基高层结构完整体系的水平地震响应整体分析方法，同时分析了典型的高层框－剪结构的动力特点。引用动态群桩基础试验模型验证，结果良好，并用可比较的数字例说明，所提出的分析方法比假设刚性地基或单一刚性桩台精确，仅增加有限未知量，对实际工程切实可行。
From the view points of the entirety of a structure,an entire analytcial method to compute the responses of a complete tall structure supported on piles under horizontal earthquake action is presented in this paper.The method is guided by the superstructure including multi-cap of piles through introducing a structural model of walled frame in consideration of the different shaking effects of the caps. The impedance functions of pile-headsof a pile-soil subsystem are synthetically used to evaluate the dynamic effect of pile group.The dynamic characteristic of typical structures of frame-shear wall is analyzed. The results are examined and found to agree well with a dynamic experimental model of pile group foundation.Numerical examples indicate that the accuracy of the suggested method is better than that by the methods in which rigid base or single rigid pile-cap is assumed,and only limited number of unknowns are increased in the suggested method.This method is quite feasible for engineering practice.
From the view points of the entirety of a structure,an entire analytcial method to compute the responses of a complete tall structure supported on piles under horizontal earthquake action is presented in this paper.The method is guided by the superstructure including multi-cap of piles through introducing a structural model of walled frame in consideration of the different shaking effects of the caps. The impedance functions of pile-headsof a pile-soil subsystem are synthetically used to evaluate the dynamic effect of pile group.The dynamic characteristic of typical structures of frame-shear wall is analyzed. The results are examined and found to agree well with a dynamic experimental model of pile group foundation.Numerical examples indicate that the accuracy of the suggested method is better than that by the methods in which rigid base or single rigid pile-cap is assumed,and only limited number of unknowns are increased in the suggested method.This method is quite feasible for engineering practice.
引文
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