桩-黄土-结构体系地震动力相互作用的数值分析  

Dynamic Analysis of Pile-loess-structure System by Finite-infinite Element Method

作　　者：胡伟[1] 韩建刚[1] 郭娟 

机构地区：[1]海南大学土木建筑工程学院,海口570228 [2]陕西省现代建筑设计研究院,西安710048

出　　处：《武汉理工大学学报》2010年第9期129-132,共4页Journal of Wuhan University of Technology

基　　金：海南省自然科学基金(809001);国家自然科学基金(50668001)

摘　　要：引入饱和黄土的结构性动力本构模型,结合通用有限元程序建立了桩-土-结构体系的有限元-无限元耦合模型,分别考察了水平地震作用下土体结构性和超孔隙水压力对桩身截面剪应力、水平位移、水平加速度分布的影响。研究表明:结构性、超孔压没有改变桩身各曲线的分布形态,但对其大小有一定的影响。具体表现为:随着土体结构性系数的增大,桩身截面剪应力及桩顶水平位移均先增后降,存在一个峰值点;考虑超孔压时,桩身水平位移最大值、桩截面剪应力最大值和桩身水平加速度最大值都有所增大,其中后两者的分布具有反相关性;不考虑超孔压力的影响总体上是偏于不安全的。Dynamic structural model of saturated loess was introduced,and combined with the finite element program,the finite-infinite element model of pilesoil-structure system is established to research the influences of structure and super-pore pressure on the system＇s dynamic characteristics,which include the distributing of pile section＇s shearing stress,horizontal displacement and acceleration.The results indicate that,two factors don＇t change their distributing shapes,but have effects on their values.Along with the increase of soil＇s structure,both of shearing stress and horizontal displacement are increased initially,and then reduced.There has a peak value point.When the super-pore pressure is considered,the maximum of pile＇s horizontal displacement,shearing stress and horizontal acceleration all have a certain increase,and the latter two ones＇ distributing is anti-related to each other.On the whole,it is inclined to be unsafe of analysis which is not to consider the super-pore pressure.

关 键 词：结构性饱和黄土 超孔隙水压力 桩-土-结构体系 有限元-无限元 动力相互作用 

分 类 号：TU375.4[建筑科学—结构工程] TU473.1