桩土共同作用下桩长对结构抗震性能影响分析  

Analysis on the Influence of Pile Length to the Anti-seismic Capability of Constructions Based on Pile-soil Interaction

作　　者：周春霖[1] 陆浩亮[1] 朱合华[1] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《华北地震科学》2009年第3期7-11,共5页North China Earthquake Sciences

摘　　要：桩基础是松软深厚地基上高层建筑的主要基础形式,其长度直接影响高层建筑的抗震性能。尽管桩基础有较广的应用范围,但桩长与结构整体抗震性能的相关性研究还颇为少见。根据上海某高层建筑地基基础结构数据建立软土地基上桩基础高层建筑平面动力有限元计算模型,以横观各向同性材料模拟软土地基,弹性阻尼人工边界模拟地基半无限体,薄膜单元模拟桩土间接触滑移性能,并考虑桩-土-结构共同作用,采用上海地铁某车站地震监测数据作为地震波输入,在其他条件不变的情况下选择各种桩长进行计算,根据计算结果分析讨论在该模型条件下桩长选择对上部结构以及桩基础整体抗震性能的影响,提出优化方案。Pile foundation is the primary foundation form of high buildings on soft ground. The length of pile foundation is concerned with the anti - seismic ability of unitary structure. While pile foundations are widely used at present, there is little research about the relationship of structure anti- seismic ability and the length of pile foundation. 2D dynamic FEM model of high building with pile foundation on soft ground is created with data of one high building with frame structure in Shanghai. Transversely isotropy material is used to simulate the soft ground; spring - dump artificial boundary to semi - infinite ground; film element to the contact and slippage performance of pile and soil; and pile - soil - structure interaction is considered. Seismic monitor data besides one subway station in Shanghai is used as input earthquake wave. Series of dynamic FEM computing is proceeded with different pile length while holding all other parameters. The influence of pile length to the anti - seismic capability of building and pile foundation is analyzed, optimized scheme is advanced.

关 键 词：动力有限元 桩基础 桩长 抗震 

分 类 号：P351.9[天文地球—空间物理学]