不同埋深处土质场地地下结构地震内力变化规律  

Law of Internal Force Changes for Understructures in Soil Site with Different Depth Under Earthquake

作　　者：董正方[1] 朱红云[1] 蔡宝占 闫超 Dong Zheng-fang Zhu Hong-yun Cai Bao-zhan Yan Chao(Institute of Materials and Structures, Henan University, Kaifeng 475004, Chin)

机构地区：[1]河南大学材料与结构研究所,河南开封475004

出　　处：《工程抗震与加固改造》2017年第5期143-148,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(51408195);河南省教育厅科学技术研究重点项目(14B560031);河南大学科研基金项目(2013YBZR002)

摘　　要：地震作用下不同埋深的土质场地地下结构的反应是不同的,为此开展了不同埋深的结构内力的变化规律研究。本文选取两个实际土质场地条件下典型的地下结构为基准模型,设定不同的埋深工况;将土质场地地下结构体系简化为平面应变问题,结构采用弹性梁单元,土体采用平面应变单元,土体非线性采用等效线性化;侧向边界取较大宽度以减弱边界影响,进行动力时间历程法分析,提取侧墙最不利位置的内力进行分析。结果表明:场地类别、土层厚度对结构内力随埋深变化有影响;内力中的弯矩和剪力有先变大再变小的趋势,存在最不利埋深。Because of different seismic response with different depth under earthquake,research on the law of internal force changes versus the depth is conducted by numerical analysis. In this paper,Varied burial depth working conditions are designed based on two selected benchmark soil sites examples,such as a site in Shanghai and a site in Zhengzhou. Understructure in soil is simplified as a plane strain problem,in which the understructure applies beam elements and the soil applies plane strain elements. Soil nonlinearity applies equivalent linear model and the artificial boundary is so far that response of structures is not affected. The most dangerous internal forces of side wall are computed through dynamic time history method. It is shown that the law of internal force changes is affected by site condition and soil layer thickness. and the law of internal force,such as bending moment and shear force,is big then small and is severestdepth.

关 键 词：岩土工程 内力变化 数值分析 地下结构 埋深 

分 类 号：TU435[建筑科学—岩土工程] TU93[建筑科学—土工工程]