地下结构地震反应的平面计算模型研究  

Discuss on Plain Strain Model for Seismic Response of Underground Structure

作　　者：殷琳 舒恩 楼梦麟[3] 蔡海兵[2] Yin Lin;Shu En;Lou Menglin;Cai Haibing(School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,Zhejiang,China;School of Civil Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]宁波工程学院,建筑与交通工程学院,浙江宁波315211 [2]安徽理工大学,土木建筑学院,安徽淮南232001 [3]同济大学,土木工程学院,上海200092

出　　处：《震灾防御技术》2022年第4期727-734,共8页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(91315301);安徽省2019年度高校学科(专业)拔尖人才学术资助项目。

摘　　要：采用平面应变模型对地下结构进行地震反应分析时,其核心问题是中柱的二维等效简化。常用的简化方法是将中柱的材料性质(如弹性模量和密度)进行折减。在此基础上,进一步引入空间约束影响系数和三维还原系数,提出新的中柱二维等效简化方法。针对不同简化方法,分别建立对应的地下结构地震反应分析平面应变模型,计算各模型的地震反应。通过与三维模型计算结果进行对比分析,研究不同简化方法的合理性。计算结果表明,本研究建议的方法可有效提高地下结构平面应变模型的计算精度。The method to simplify inner column is a key point when plane strain model is picked to compute seismic response of underground structure.The commonly used simplification method for the inner columns is to reduce its values of material properties,such as Young’s Modulus and density.Based on common methods,the space constraint influence coefficient and the three-dimensional reduction coefficient were introduced in this paper furtherly,and a new plane strain model simplified method for the center column was proposed.According to three different simplified methods,three plane strain models for seismic response analysis of underground structures were established respectively,and the seismic response of each model was calculated.By comparing the calculation results with the three-dimensional model,the rationality of different simplification methods was discussed.The calculation results show that the method proposed in this paper can effectively improve the calculation accuracy of the plane strain model of underground structures.

关 键 词：地下结构 地震反应 平面应变模型 内力误差 

分 类 号：TU311.3[建筑科学—结构工程] TU93