大型桩基础动力特性及地震反应分析  

Dynamic Characteristic and Seismic Response Analysis of Large Pile Foundation

作　　者：陈清军[1] 赵云峰[1] 楼梦麟[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《力学季刊》2001年第3期389-395,共7页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(49804002;59823002);高等学校骨干教师资助计划资助

摘　　要：本文针对大型桩基础的地震反应问题,以上海“东方明珠”广播电视塔桩基础为工程背景,采用梁单元模拟桩的运动,用8节点块体单元对土体进行离散,通过凝聚法消去桩(梁)节点的转动自由度,建立了“东方明球”电视塔中央部位桩基础的三维有限元分析模型,对桩基础的动力特性进行了计算与分析。在此基础上,以文献[1]根据地震危险性分析和土层反应分析后获得的桩尖处加速度时程作为输入,对桩基础的动力反应进行时程分析,探讨了桩—土动力相互作用和上部结构等因素对地震地面运动和桩承台反应的影响,得到了一些有应用价值的结果。In this paper, the dynamic characteristic and seismic response analysis of a large pile foundation was investigated by the engineering background of Shanghai 'Eastward Bright Pearl' TV tower. The middle pile-foundaton model of Shanghai TV tower was established by using finite element method. The artificial time history gotten by seismic risk analysis and soil-layer response analysis were applied as the input of the pile foundation, and the seismic response of pile foundation was studied by using Wilson-9 method. The effective seismic input for superstructure seismic response analysis was obtained. The effect of pile-soil dynamic interaction and superstructure inertial on ground motion and pile-footing response was also discussed.

关 键 词：大型桩基础 动力特性 桩承台地震反应 时程分析 软土 反应分析 梁单元 凝聚法 三维有限元分析模型 

分 类 号：TU311.3[建筑科学—结构工程]