陡坎地形框架结构抗震数值模拟分析

Numerical Simulation Analysis of Seismic of Frame Structure on Hill Terrain

近年来我国汶川、雅安、玉树等地区接连发生高震级的地震,而这些地震区域均有类似的多山地形,浅山地区建筑结构抗震日益引起人们的关注,进而拟对浅山地区中陡坎地形对建筑结构抗震影响进行研究.研究内容主要包括:通过有限元ANSYS数值仿真建模,对一个10层的混凝土框架结构-陡坎地形相互作用进行数值模拟计算.首先进行土-结构相互作用与刚性地基假定情况下动力特性的简单对比分析;然后将陡坎-土-结构相互作用(Hill-Soil-Structure Interaction,简称HSSI)与土-结构相互作用(Soil-Structure-Interaction,简称SSI)进一步的分析对上部结构的动力响应,包括进行结构的模态分析(振型、周期)、时程分析(位移、内力、加速度)等.通过陡坎-土-结构相互作用的研究,模型之间的比对,分析每个因素的影响程度,给出浅山地区陡坎地形建筑结构抗震关键技术措施,为此类结构理论研究提供借鉴.

In recent year,earthquakes with high magnitude frequently occurred in such areas as Wenchuan,Ya＇an,Yushu in china,which are similar in mountainous terrain.Therefore,building seismic structure increasingly aroused our concern,In this paper,the influence of hill topography on building seismic structure in shallow mountains is studied.The research is mainly as follows：modeling was built by the ANSYS software,through which the cooperative effects of a ten layer of frame structure-hill system were calculated.Firstly,dynamic characteristics analysis of soil-structure interaction and the rigid foundation assumption conditions are simply compared.Secondly,Hill-Soil-Structure Interaction（referred to HSSI）and Soil-Structure-Interaction（referred to SSI）are further analyzed,including structural modal analysis（vibration mode,cycle）,the time history analysis（such as displacement,internal force and acceleration）,and so on.Through the research of Hill-Soil-Structure interaction,each factor is taken into consideration,giving key technology measures for seismic structure in shallow mountain areas,providing reference for such structure research.