对反应位移法中几个关键问题的探讨
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摘要
反应位移法是地下结构抗震分析最常用方法之一。本文拟通过具体算例分析,探讨了目前反应位移法在实际应用中的几个简化假设,具体包括土弹簧刚度的不同确定方法、分层土体与等效单层土体的位移模式、线性与非线性时土体位移模式等。计算分析表明:(1)不同方法确定的土弹簧刚度值相差巨大,由此导致结构地震响应差别显著;(2)分层与单层土以及线形土体与非线性土体的土体位移模式相差明显,即周围土体对地下结构的地震作用差别明显,因而地下结构地震响应差异明显。由此可见在实际应用反应位移法时,应严格按照实际分层土体,得到土体的非线性地震响应,而应避免采用一些简化等效处理方法。本文研究成果可为进一步完善反应位移提供参考。
Displacement response method is one of the most popular methods for seismic response analysis of underground structure. Several simplifications and assumptions in response displacement method were investigated based on some specific examples in this paper,which include different methods for soil spring stiffness determination,displacement mode of layered soil or uniform single layer soil,linear and nonlinear soil displacement modes. The analysis results showed that:( 1) There were large differences between soil spring stiffness determined by different methods,which would cause big differences in seismic response of underground structure;( 2) The differences of displacement modes for layered soil and uniform soil,linear and nonlinear soil were significant,which would also lead to quite different seismic response of underground structure. Therefore,the actual layered soil and soil nonlinear seismic response should be obtained when the response displacement method is employed in practical projects. The research results in this paper can provide references to improve response displacement method.
Displacement response method is one of the most popular methods for seismic response analysis of underground structure. Several simplifications and assumptions in response displacement method were investigated based on some specific examples in this paper,which include different methods for soil spring stiffness determination,displacement mode of layered soil or uniform single layer soil,linear and nonlinear soil displacement modes. The analysis results showed that:( 1) There were large differences between soil spring stiffness determined by different methods,which would cause big differences in seismic response of underground structure;( 2) The differences of displacement modes for layered soil and uniform soil,linear and nonlinear soil were significant,which would also lead to quite different seismic response of underground structure. Therefore,the actual layered soil and soil nonlinear seismic response should be obtained when the response displacement method is employed in practical projects. The research results in this paper can provide references to improve response displacement method.
引文
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[10]王璐.地下建筑结构实用抗震分析方法研究[D].重庆:重庆大学,2011.(Wang Lu.Study on practical seismic analysis method for underground structures[D].Chongqing:Chongqing University,2011.(in Chinese))
[2]潘东旭,陶连金,刘璐,等.地震作用下层状土中地铁车站变形规律研究[J].地下空间与工程学报,2013,9(3):552-557.(Pan Dongxu,Tao Lianjin,Liu Lu,et al.Study on the deformation of subway station in layered soil under earthquake[J].Chinese Journal of Underground Space and Engineering,2013,9(3):552-557.(in Chinese))
[3]禹海涛,袁勇,张中杰,等.反应位移法在复杂地下结构抗震中的应用[J].地下空间与工程学报,2011,7(5):857-862.(Yu Haotai,Yuan Yong,Zhang Zhongjie,et al.Application of response displacement method on seismic design of a complex underground structure[J].Chinese Journal of Underground Space and Engineering,2011,7(5):857-862.(in Chinese))
[4]刘晶波,王文晖,赵冬冬.地下结构横截面地震反应拟静力计算方法对比研究[J].工程力学,2013,30(1):105-111.(Liu Jingbo,Wang Wenhui,Zhao Dongdong.Comparison of the pseudo-static methods for seismic analysis of the underground structures[J].Engineering Mechanics,2013,30(1):105-111.(in Chinese))
[5]宋磊,王涛,韦扣均,等.软土地区地铁车站抗震计算方法及分析[J].地下空间与工程学报,2014,10(增1):1 694-1 670.(Song Lei,Wang Tao,Wei Koujun,et al.Seismic calculation and analysis of subway station in soft soil area[J].Chinese Journal of Underground Space and Engineering,2014,10(Supp.1):1 694-1 670.(in Chinese))
[6]刘晶波,王文晖,张小波,等.地下结构横断面地震反应分析的反应位移法研究[J].岩石力学与工程学报,2013,32(1):161-167.(Liu Jingbo,Wang Wenhui,Zhang Xiaobo,et al.Research on response deformation method in seismic analysis of underground structure[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(1):161-167.(in Chinese))
[7]Kiyomiya O.Earthquake-resistant design features of immersed tunnels in Japan[J].Tunneling and Underground Space Technology,1995,10(4):463-475.
[8]Wang J N.Seismic design of tunnels:a simple state-ofthe-art design approach[M].New York:Parsons Brinckerhoff Quade and Douglas Inc.,1993.
[9]边金,陶连金,张印涛,等.地下结构抗震设计方法的比较与分析[J].现代隧道技术,2008,45(6):50-55.(Bian Jin,Tao Lianjin,Zhang Yintao,et al.Comparison and analysis of the aseismic design methods for underground structures[J].Modern Tunneling Technology,2008,45(6):50-55.(in Chinese))
[10]王璐.地下建筑结构实用抗震分析方法研究[D].重庆:重庆大学,2011.(Wang Lu.Study on practical seismic analysis method for underground structures[D].Chongqing:Chongqing University,2011.(in Chinese))
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