双层岛式地铁车站结构地震反应分析
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摘要
以深圳某双层两跨岛式地铁车站为工程背景,考虑水平地震和水平、竖向地震耦合2种工况,采用ANSYS分析软件,研究SSI(土与结构相互作用)效应下结构的水平位移特征和内力响应规律。结果表明:与水平地震工况相比,耦合地震作用下结构最大内力增幅较大,由于竖向惯性荷载作用,产生最大内力位置不同;周围土体介质的变形与结构在震动中的变形关系密切;沿车站侧墙高度的相对水平位移在2种地震工况作用下的变化不容忽视,不可忽略竖向地震的影响,耦合地震作用下的相对水平位移可用线性曲线拟合。研究成果可为地铁车站的抗震设计提供参考。
An island subway station is selected in Shenzhen to study seismic response for a soil-structure interaction system.Considering the following two conditions,the horizontal earthquake and the coupling effect of horizontal and vertical earthquake,the displacement characteristics and the internal force response of the subway station are analyzed respectively by using the ANSYS finite-element software.The results indicate that: under the action of two types of the earthquakes,the changes of maximum internal force value can't be ignored;because of the effect of inertia vertical load,the position of the maximum internal force value is different under the two conditions and should be paid more attention.Compared with the structural displacement response under the horizontal earthquake,the horizontal relative displacements are larger than that under the vertical earthquake,and linear curve fitting is valid applied to the horizontal relative displacements;moreover,the deformation of surrounding soil is closely related to the structural deformation.The results provide reference to the seismic design of subway station.
An island subway station is selected in Shenzhen to study seismic response for a soil-structure interaction system.Considering the following two conditions,the horizontal earthquake and the coupling effect of horizontal and vertical earthquake,the displacement characteristics and the internal force response of the subway station are analyzed respectively by using the ANSYS finite-element software.The results indicate that: under the action of two types of the earthquakes,the changes of maximum internal force value can't be ignored;because of the effect of inertia vertical load,the position of the maximum internal force value is different under the two conditions and should be paid more attention.Compared with the structural displacement response under the horizontal earthquake,the horizontal relative displacements are larger than that under the vertical earthquake,and linear curve fitting is valid applied to the horizontal relative displacements;moreover,the deformation of surrounding soil is closely related to the structural deformation.The results provide reference to the seismic design of subway station.
引文
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[3]陈健云,李建波,李静,等.土层性质及结构特性对地铁车站的影响[C]//隧道、地下工程及岩石破碎理论与应用.大连:大连理工大学,2007:206-218.Chen Jianyun,Li Jianbo,Li Jing,et al.The effect of soil characteristic and structural property on subway station[C]//Theory and Application ofTunneling,Underground Engineering and Rock Fragmentation.Dalian:Dalian University of Technology,2007:206-218.
[4]庄海洋,陈国兴,左熹.水平向地震下双层岛式地铁车站结构的动力变形特征[J].地震工程与工程振动,2007,27(6):140-147.Zhuang Haiyang,Chen Guoxing,Zuo Xi.Analysis of dynamic deformation characteristics of two-layer subway station structure under horizontalearthquakes[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(6):140-147.
[5]马伟东,王国波,谢伟平.武汉市地铁车站结构的三维地震响应分析[J].铁道科学与工程学报,2008,5(4):74-77.Ma Weidong,Wang Guobo,Xie Weiping.Analysis of3-D seismic response of subway station structures in Wuhan city[J].Journal of Railway Sci-ence and Engineering,2008,5(4):74-77.
[6]郑永来,周橙,黄炜,等.动态弹性模量的实验研究[J].河海大学学报,1998,26(2):31-35.Zheng Yonglai,Zhou Cheng,Huang Wei,et al.Experimental study on dynamic elastic modulus[J].Journal of Hehai University,1998,26(2):31-35.
[7]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.Liu Jingbo,Lu Yandong.A direct method for analysis of dynamic soil-structure interaction[J].China Civil Engineering Journal,1998,31(3):55-64.
[8]李彬.地铁地下结构抗震理论分析与应用研究[D].北京:清华大学,2005.Li Bin.Theoretical analysis of seismic response of underground subway structures and its application[D].Beijing:Tsinghua University,2005.
[9]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(2):30-36.Lou Menglin,Wang Wenjian,Zhu Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Journal ofEarthquake Engineering and Engineering Vibration,2000,20(2):30-36.
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