浅埋地下结构抗震设计的反应位移法关键问题

第42卷第6期2016年6月北京工业大学学报JOURNAL OF BEIJING UNIVERSITY OF TECHNOLOGY Vol.42No.6Jun.2016

安军海1,2,安林轩1,2,李积栋3,陈向红1,2,郭飞1,2

(1.北京工业大学建筑工程学院,北京 100124;2.北京城市交通协同创新中心,北京 100124;3.中国建筑股份有限公司技术中心,北京 101300)摘要:为了解决采用反应位移法进行地下结构抗震设计时工程师所面临的不同计算公式和模型的选取及土体是否需要分层等问题,通过具体算例分析,探讨了影响反应位移法计算精度的几个主要因素,具体包括不同规范中推荐的土体相对位移及剪应力的计算公式二土弹簧刚度的确定方法二分层土体与等效单层土体的差异二荷载-结构模型的选择等.研究结果表明:不同方法确定的土体相对位移二剪应力及土弹簧刚度值相差很大,由此造成的结构内力和变形差异显著,推荐公式应谨慎采用;对存在中柱体系的地下结构,荷载-结构模型应优先采用等代框架模型;采用反应位移法计算时,应严格按照实际分层土体完成土层地震响应分析,避免进行等效均一化处理.

关键词:反应位移法;地下结构;抗震设计;等代框架

中图分类号:TU 311.3;U 231

文献标志码:A 文章编号:0254-0037(2016)06-0926-07doi :10.11936/bjutxb2015080015收稿日期:2015-08-05

基金项目:国家自然科学基金资助项目(90715035,41272337,51421005)

作者简介:安军海(1987 ),男,博士研究生,主要从事地下结构抗震方面的研究,E-mail:tsanjunhai@https://www.360docs.net/doc/7a17995956.html, Response Displacement Method in Several Key Issues of Shallow Buried Underground Structure Seismic Design

AN Junhai 1,2,AN Linxuan 1,2,LI Jidong 3,CHEN Xianghong 1,2,GUO Fei 1,2

(1.College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;2.Center of Cooperative Innovation for Beijing Metropolitan Transportation,Beijing 100124,China;3.China State Construction Technical Center,Beijing 101300,China)Abstract :In order to solve problems of selection of different formulas,calculation model as well as whether need to be decorated in layered soil and so on,in view of actual engineering applications,several main factors affecting the calculation accuracy of response displacement method were discussed based on some specific examples in this paper.The examples include different calculation formulas for relative displacement of soil and shear stress recommended by codes,different methods for soil spring stiffness determination,the differences between equivalent single layer soil and actual layered soil,and the choice of load-structure models.The results show that there are large differences on soil relative displacement,

shear stress and soil spring stiffness that calculated by different methods,which can cause remarkably differences in structure s internal force and deformation.Recommended formula should be carefully used.In situation of an underground structure with beam-column system,the equivalent planar frame model should be adopted firstly.Additionally,the actual layered soil should be used to complete the soil seismic response analysis when the response displacement method is employed.

Key words :response displacement method;underground structure;aseismic design;equivalent planar frame model