地铁车站结构振动台试验及地震响应的三维数值模拟
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摘要
利用FLAC3D对典型地铁车站结构振动台模型试验进行三维数值模拟,所建立的计算模型包括:(1)计算区范围与模型箱尺寸一致;(2)采用Davidenkov模型描述模型土的非线性变形特性,而结构模型采用弹性模型;(3)由于不考虑模型箱在振动过程中的变形,因此动力边界条件取为加速度边界;(4)地震荷载的输入与试验时地震波输入一致。计算结果包括模型土和车站结构的加速度响应规律、车站结构的动应变以及土–结构间的动土压力。计算结果与振动台试验结果吻合较好,说明采用的方法能较好地模拟模型土的动力特性,反映车站结构的动力响应及土与地铁车站结构间动力相互作用的规律。该研究工作能为建立典型软土地铁车站结构地震响应的三维计算方法提供基础。
The shaking table test on typical metro station structure is simulated by FLAC3D. The calculation model includes the following four aspects. (1) The calculation area is identical with the model box. (2) The Davidenkov model is employed to simulate the dynamic nonlinear characteristics of model soil;and the structural model is regarded as in elastic state during test. (3) The dynamic boundary conditions are set as acceleration boundaries because the deformation of model box can be neglected. (4) The seismic loads accord with the waves used in the test. The test and calculation results include the rules of acceleration response of model soil and metro station structure model,the dynamic strain of metro station structure model and the dynamic soil pressure between model soil and structure model. The calculation results agree well with the test results,which shows the rationality of the proposed model. It can be used to simulate the dynamic characteristics of model soil,calculate the dynamic response of metro station structure and analyze the dynamic interaction between soil and structure. The study provides foundations to establish the 3D calculation method for metro station structure under seismic load in soft soil areas.
The shaking table test on typical metro station structure is simulated by FLAC3D. The calculation model includes the following four aspects. (1) The calculation area is identical with the model box. (2) The Davidenkov model is employed to simulate the dynamic nonlinear characteristics of model soil;and the structural model is regarded as in elastic state during test. (3) The dynamic boundary conditions are set as acceleration boundaries because the deformation of model box can be neglected. (4) The seismic loads accord with the waves used in the test. The test and calculation results include the rules of acceleration response of model soil and metro station structure model,the dynamic strain of metro station structure model and the dynamic soil pressure between model soil and structure model. The calculation results agree well with the test results,which shows the rationality of the proposed model. It can be used to simulate the dynamic characteristics of model soil,calculate the dynamic response of metro station structure and analyze the dynamic interaction between soil and structure. The study provides foundations to establish the 3D calculation method for metro station structure under seismic load in soft soil areas.
引文
[1]CHE A,IWATATE T.Shaking table test and numerical simulation of seismic response of metro structures[J].Structures under Shock and Impact VII,2002,11:367–376.
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[4]徐龙军,谢礼立,胡进军.地下地震动工程特性分析[J].岩土工程学报,2006,28(9):1106–1111.(XU Longjun,XIE Lili,HU Jinjun.Analysis of engineering characteristics of sub-ground motions[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1106–1111.(in Chinese)).
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[6]赵大鹏,宫必宁,晏成明.大跨度地下结构振动性态试验研究[J].重庆建筑大学学报,2002,24(5):52–57.(ZHAO Dapeng,GONG Bining,YAN Chengming.Experimental analysis of vibration behavior for large-span underground structure[J].Journal of Chongqing Jianzhu University,2002,24(5):52–57.(in Chinese))
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[8]杨林德,李文艺,祝龙根,等.上海市地铁区间隧道和车站的地震灾害与防治对策研究[R].上海:同济大学,上海防灾救灾研究所,1999.(YANG Linde,LI Wenyi,ZHU Longgen,et al.Research on disaster prevention for tunnel and metro station in Shanghai[R].Shanghai:Tongji University,Shanghai Institute of Disaster Prevention and Relief,1999.(in Chinese))
[9]杨林德,陆忠良,白廷辉,等.上海地铁车站抗震设计方法研究[R].上海:同济大学,上海防灾救灾研究所,2002.(YANG Linde,LU Zhongliang,BAI Tinghui,et al.Research on seismic design method for metro station in Shanghai[R].Shanghai:Tongji University,Shanghai Institute of Disaster Prevention and Relief,2002.(in Chinese))
[10]杨林德,杨超,季倩倩,等.地铁车站的振动台试验与地震响应的计算方法[J].同济大学学报(自然科学版),2003,31(10):1135–1140.(YANG Linde,YANG Chao,JI Qianqian,et al.Shaking table test and numerical calculation on metro station structures in soft soil[J].Journal of Tongji University(Natural Science),2003,31(10):1135–1140.(in Chinese))
[11]杨林德,季倩倩,郑永来,等.地铁车站结构振动台试验中模型箱设计的研究[J].岩土工程学报,2004,26(1):75–78.(YANG Linde,JI Qianqian,ZHENG Yonglai,et al.Study on design of test box in shaking table test for metro station structure in soft soil[J].Chinese Journal of Geotechnical Engineering,2004,26(1):75–78.(in Chinese))
[12]季倩倩.地铁车站结构振动台模型试验研究[博士学位论文][D].上海:同济大学,2002.(JI Qianqian.Shaking table testing on underground metro station structures[Ph.D.Thesis][D].Shanghai:Tongji University,2002.(in Chinese))
[2]LI Z N,LI Q S,LOU M L.Numerical studies on the effects of the lateral boundary on soil-structure interaction in homogeneous soil foundations[J].Structural Engineering and Mechanics,2005,20(4):421–434.
[3]刘晶波,李彬,谷音.地铁盾构隧道地震反应分析[J].清华大学学报(自然科学版),2005,45(6):757–760.(LIU Jingbo,LI Bin,GU Yin.Seismic response analysis of shielded metro tunnels[J].Journal of Tsinghua University(Science and Technology),2005,45(6):757–760.(in Chinese))
[4]徐龙军,谢礼立,胡进军.地下地震动工程特性分析[J].岩土工程学报,2006,28(9):1106–1111.(XU Longjun,XIE Lili,HU Jinjun.Analysis of engineering characteristics of sub-ground motions[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1106–1111.(in Chinese)).
[5]YUKIO T,IKLO T.Seismic soil-structure interaction of cross sections of flexible underground structures subjected to soil liquefaction[J].Soils and Foundations,2003,43(2):69–87.
[6]赵大鹏,宫必宁,晏成明.大跨度地下结构振动性态试验研究[J].重庆建筑大学学报,2002,24(5):52–57.(ZHAO Dapeng,GONG Bining,YAN Chengming.Experimental analysis of vibration behavior for large-span underground structure[J].Journal of Chongqing Jianzhu University,2002,24(5):52–57.(in Chinese))
[7]车爱兰,岩楯敞广,葛修润.关于地铁地震响应的模型振动试验及数值分析[J].岩土力学,2006,27(8):1293–1298.(CHE Ailan,IWATATE T,GE Xiurun.Dynamic behaviors of metro structure subjected to strong earthquake motions using shaking table tests and dynamic analyses[J].Rock and Soil Mechanics,2006,27(8):1293–1298.(in Chinese))
[8]杨林德,李文艺,祝龙根,等.上海市地铁区间隧道和车站的地震灾害与防治对策研究[R].上海:同济大学,上海防灾救灾研究所,1999.(YANG Linde,LI Wenyi,ZHU Longgen,et al.Research on disaster prevention for tunnel and metro station in Shanghai[R].Shanghai:Tongji University,Shanghai Institute of Disaster Prevention and Relief,1999.(in Chinese))
[9]杨林德,陆忠良,白廷辉,等.上海地铁车站抗震设计方法研究[R].上海:同济大学,上海防灾救灾研究所,2002.(YANG Linde,LU Zhongliang,BAI Tinghui,et al.Research on seismic design method for metro station in Shanghai[R].Shanghai:Tongji University,Shanghai Institute of Disaster Prevention and Relief,2002.(in Chinese))
[10]杨林德,杨超,季倩倩,等.地铁车站的振动台试验与地震响应的计算方法[J].同济大学学报(自然科学版),2003,31(10):1135–1140.(YANG Linde,YANG Chao,JI Qianqian,et al.Shaking table test and numerical calculation on metro station structures in soft soil[J].Journal of Tongji University(Natural Science),2003,31(10):1135–1140.(in Chinese))
[11]杨林德,季倩倩,郑永来,等.地铁车站结构振动台试验中模型箱设计的研究[J].岩土工程学报,2004,26(1):75–78.(YANG Linde,JI Qianqian,ZHENG Yonglai,et al.Study on design of test box in shaking table test for metro station structure in soft soil[J].Chinese Journal of Geotechnical Engineering,2004,26(1):75–78.(in Chinese))
[12]季倩倩.地铁车站结构振动台模型试验研究[博士学位论文][D].上海:同济大学,2002.(JI Qianqian.Shaking table testing on underground metro station structures[Ph.D.Thesis][D].Shanghai:Tongji University,2002.(in Chinese))
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