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中文摘要：
考虑土的非线性,采用弹塑性边界面模型,对上海软土场地进行三维地震反应分析。利用多维地震动作用下的水平地层弹塑性动力反应分析程序,以具有水平和垂直三向完整加速度记录的Taft波作为地震输入,对比分析单向和多向地震输入场地水平和竖向地震反应特征,并分析不同强度地震动输入下竖向和水平加速度峰值比特征及地下水位变化对场地土层地震反应特征的影响。计算分析表明,竖向与水平向地震反应特征有较大差异;与水平单向地震输入相比,三向地震输入场地土层放大效应明显增大;地下水位上升对水平向和竖向峰值加速度的放大效应影响差异显著,地下水位上升,地表水平峰值加速度放大效应增大,竖向峰值加速度放大效应减小,研究结果对上海地区的工程抗震设计具有参考作用。
英文摘要：
Reduced order bounding surface model was employed to study 3-D seismic ground response of site considering the nonlinearity of soft soils in Shanghai.A nonlinear procedure for response analysis of horizontal layered sites subjected to multidirectional earthquake loading was used to study vertical and horizontal ground responses,respectively,under unidirectional and multidirectional base excitations（Taft）.Also,the development of ratio of vertical and horizontal peak acceleration and the effects of the variation of groundwater table on the characteristics of seismic responses were studied.The study results show that the characteristics of vertical seismic ground response are much different from those of horizontal seismic ground response;the amplification effect is greatly increased under multidirectional base excitations compared with that under unidirectional base excitations;greatly difference is induced by the rise of groundwater table between vertical and horizontal seismic response,as result of the rise of groundwater table,seismic amplification effect at ground surface increases in horizontal direction,but decreases in vertical direction,which are important for geotechnical engineering aseismic design in Shanghai region.
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