地下综合管廊地震响应研究
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摘要
通过动力方程的推导,提出在地下结构抗震分析中,位移时程输入可能是更好的选择.在此基础上,考虑多种因素,建立了三维地下综合管廊有限元模型,分析了其在地震作用下的响应特性.研究发现,在轴向地震动输入情况下,结构出现整体弯曲变形.另外边界以及接触面条件对结构应变影响较大.在结构考虑为弹性的情况下,自由边界较无限单元情况下的结构应变幅值明显偏小,相对误差最大可达123.3%,当不考虑土体与结构之间的相对滑移时,结构的应变增大幅度可以达1/3之多.最后对行波效应的影响进行了探讨.
The displacement time history input is recommanded for the seismic analysis of underground structures based on the deduction of the dynamic equation.A three-dimensional finite element model of the utility tunnel with a consideration of many effects is established for the seismic analysis.The results reveal that the utility tunnel exhibits global bending deformation pattern under shear wave excitation.On the other hand,the effects of the boundary and the contact condition are significant to the structural strain.On the assumption that the structure is elastic,the strain amplitude of the free boundary condition is rather lower compared to the infinite element boundary condition,and the maximum relative error can reach 123.3%.When the slippage between the soil and structure is not considered,the structural strain amplitude can increase about 1/3.Finally,the paper presents a study of the influence of wave passage effect.
The displacement time history input is recommanded for the seismic analysis of underground structures based on the deduction of the dynamic equation.A three-dimensional finite element model of the utility tunnel with a consideration of many effects is established for the seismic analysis.The results reveal that the utility tunnel exhibits global bending deformation pattern under shear wave excitation.On the other hand,the effects of the boundary and the contact condition are significant to the structural strain.On the assumption that the structure is elastic,the strain amplitude of the free boundary condition is rather lower compared to the infinite element boundary condition,and the maximum relative error can reach 123.3%.When the slippage between the soil and structure is not considered,the structural strain amplitude can increase about 1/3.Finally,the paper presents a study of the influence of wave passage effect.
引文
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[12]Chopra A K.Dynamics of structures-theory and applications toearthquake engineering[M].2nd ed.Beijing:Pearson EducationAsia Limited and Tsinghua University Press,2001.
[2]束昱.日本的共同沟[J].中国人民防空,2003,(148):40.SHU Yu.Utility tunnels in Japan[J].Chinese Civil Air Defence,2003,(148):40.
[3]魏小林,孟悦祥.上海浦东新区张扬路地下共同沟[J].供用电,1997,14(4):6.WEI Xiaolin,MENG Yuexiang.Utility tunnel of Zhangyangroad in Pudong New Area of Shanghai[J].Electricity Supplyand Application,1997,14(4):6.
[4]彭芳乐,孙德新,袁大军,等.城市道路地下空间与共同沟[J].地下空间,2003,23(4):421.PENG Fangle,SUN Dexin,YUAN Dajun,et al.Space urban roadand common trench[J].Underground Space,2003,23(4):421.
[5]WANG Jawnan.Seismic design of tunnels——a simple state-of-the-art design approach[M].New York:Parsons BrinckerhoffInc,1993.
[6]Kuesel T R.Earthquake design excitation for subways[J].JStructural Division,1969,ASCE95(ST6):1213.
[7]Hashash Y M A,Hook J J,Schmidt B,et al.Seismic design andanalysis of underground structures[J].Tunneling andUnderground Space Tecnology,2001,(16):247.
[8]郑永来,杨林德,李文艺,等.地下结构抗震[M].上海:同济大学出版社,2005.ZHENG Yonglai,YANG Linde,LI Wenyi,et al.Earthquakeresistance of underground structures[M].Shanghai:TongjiUniversity Press,2005.
[9]于翔.地铁建设中应充分考虑抗地震作用:阪神地震破坏的启示[J].铁道建筑技术,2000,(6):32.YU Xiang.Earthquake-resistant behavior should be stressed insubway construction:inspiration from osaka-kobe earthquake[J].Railway construction technology,2006,(6):32.
[10]Lysmer Kuhlemeyer.Finite dynamic model for infinite media,engineering mechanics[J].ASCE,1969,95(EM4):859.
[11]岳庆霞,史晓军,冯明国.无限单元在地基动力反应中的应用[C]∥第七届全国地震工程学会议,广州:[s.n],2006:356-362.YUE Qingxia,SHI Xiaojun,FENG Mingguo.Usage of infiniteelements in the soil dynamic analysis[C]∥7th nationalconference on earthquake engineering,Guangzhou:[s.n],2006:356-362.
[12]Chopra A K.Dynamics of structures-theory and applications toearthquake engineering[M].2nd ed.Beijing:Pearson EducationAsia Limited and Tsinghua University Press,2001.
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