【摘要】 用整体动力有限元方法进行砂土液化场地桩-土-结构动力相互作用及桩基地震反应分析。在土体侧向的边界节点处用弹簧并联阻尼器来进行模拟;在土体平面应变单元和桩体梁单元连接处,用补充约束方程的方法进行节点耦合,使两种不同类型单元满足连续条件。结合典型工程实例选择桩-土-结构及荷载参数,重点讨论了三种不同情形下砂土液化场地土-结构相互作用对桩基地震反应的影响,分析和比较了三种情形下体系1至6阶的自振周期、基桩危险截面处的位移与内力时程和最不利时刻桩身的位移与内力等,得到了一些对工程实际有益的结论。更多还原

【Abstract】 The dynamic interaction of pile-soil-structure in liquefiable site,especially,the seismic response on pile,are studied with the method of whole dynamic finite elements under seismic condition.Applying the spring-damper to simulate soil side boundary,input restraint joint is used to settle continuous conditions of the different types of connective units.Subsequently,with the proposed method,selecting the structure of pile-soil and its load parameters,seismic response on pile under dynamic interaction of pile-soil-structure with emphasis on three kinds of sandy soil liquefaction situations is discussed.The inherent vibration periods of lst to 6th modes,together with the time histories and the peak values of displacement and inner force in the pile at the three cases are analyzed and compared.From the simulated result,some fundamental aspects of pile-soil-structure dynamic interaction in liquefiable site are investigated.更多还原