考虑地基土液化影响的桩基高层建筑体系地震反应分析

本文建立了土体－结构体系地震反应分析的混合有限元法，并研究了地基土液化对地震反应的影响。本方法把土体－结构体系简化为一个完整的体系，该体系由梁（柱）单元、剪切杆单元、刚体单元、平面四边形等参单元与三角形单元、界面单元的任意组合来模拟。桩与上部结构材料视为线弹性体，土介质视为非线性材料。土的静应力－应变关系之间的非线性用邓肯一张模型来描述；土的动应力－应变关系之间的非线性和振动孔隙水压力对土的软化效

EFFECT OF FOUNDATION SOIL LIQUEFACTION ON EARTHQUAKE RESPONSE OF PILE-SUPPORTED HIGH-RISE BUILDING SYSTEM

In this paper the authors proposes a mixed finite clement method for the earthquake response analysis of soil-structure interaction (SSI) system. SSI system in this method is simplified as an integrate system and the system is modeled by any form combination of beam (column) clement shear rod clement rigid block element plane quadrilateral isoparametric element and triangle clement interface clement. The material of piles and superstructure component is rcgarcd as linear clastic medium and soils are regared as nonlinear material. The nonlinear relationship between static stress and strain of soils is represented with the Ducan-Zhang's hyperbola model and the nonlinear relationship between dynamic shear stress and strain of soils and the effect of soil softening due to vibration pore -water pressure builtup arc considered by using the authors' method in reference 1]. The earthquake reponsc of a 16 -story pile -raft foundation high -rise building with one basement floor is analysed in detail and the effect of foundation soil liquefaction on the earthquake response of the SSI system is discussed some results having contribution to seismic design arc given.