软土地铁车站中柱在强震作用下的响应研究
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摘要
将汶川地震时获得的地震波作为输入波,利用FLAC3D软件对软土典型地铁车站中柱进行强震响应的三维数值模拟。土体采用D-P本构模型,车站结构采用弹性模型,并选用瑞利阻尼和Hardin/Drnevich模型的滞后阻尼来实现土在循环动荷载下的滞回和非线性。计算结果包括中柱的相对变形、轴力、剪力、弯矩及车站中柱的加速度响应规律。结果表明:下层中柱是地铁车站受地震波作用时最为薄弱的构件,并且中柱的破坏系水平向地震波和竖直向地震波共同作用的结果。
With the seismic wave recorded in Wenchuan earthquake as the input,the centre column of a typical metro station was simulated numerically by the software FLAC3D for its strong seismic responses.The D-P constitutive model was assumed for the soils,the elasticity for the station structure,and Rayleigh damping and Hardin/Drnevich model of hysteretic damping were used to simulate the nonlinearity and hysteresis of the soils under cyclic dynamic loading.The computational results include the relative deformation,axial force,shearing force,bending moment in the centre column,as well as its regularity of the acceleration response.They show that the centre column on the lower floor is the weakest component of the station structure in earthquake,and its damages are due to the combined effects of horizontal and vertical ground motions.
With the seismic wave recorded in Wenchuan earthquake as the input,the centre column of a typical metro station was simulated numerically by the software FLAC3D for its strong seismic responses.The D-P constitutive model was assumed for the soils,the elasticity for the station structure,and Rayleigh damping and Hardin/Drnevich model of hysteretic damping were used to simulate the nonlinearity and hysteresis of the soils under cyclic dynamic loading.The computational results include the relative deformation,axial force,shearing force,bending moment in the centre column,as well as its regularity of the acceleration response.They show that the centre column on the lower floor is the weakest component of the station structure in earthquake,and its damages are due to the combined effects of horizontal and vertical ground motions.
引文
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[2]Huo H,Bobet B,Fernandez G.Load transfer mecha-nisms between underground structure and surroundingground:evaluation of the failure of the Daikai Station[J].Journal of Geotechnical and GeoenvironmentalEngineering,2005,131(12):1522-1533.
[3]Li Z N,Li Q S,Lou M L.Numerical studies on theeffects of the lateral boundary on soil-structure inter-action in homogeneous soil foundations[J].Struc-tural Engineering and Mechanics,2005,20(4):421-434.
[4]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 J B,Li B,Gu Y.Seismic response anslysis ofshielded metro tunnels[J].Journal of Tsinghua Uni-versity(Science and Technology),2005,45(6):757-760.
[5]林利民,陈健云.软土中浅埋地铁车站结构的抗震性能分析[J].防灾减灾工程学报,2006,26(3):268-273.Lin L M,Chen J Y.Analysis of earthquake resistantcapacity of shallow-buried subway[J].Journal of Dis-aster Prevention and Mitigation Engineering,2006,26(3):268-273.
[6]吕爱钟,蒋斌松,尤春安.位移反分析有限元网格划分范围的研究[J].土木工程学报,1999,32(1):26-30.LüA Z,Jiang B S,You C A.Study on range of meshabout finite element for back analysis of displacement[J].China Civil Engineering Journal,1999,32(1):26-30.
[7]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(4):30-36.Lou M L,Wang W J,Zhu T,et al.Soil lateralboundary effect in shaking table model test of soil-structure system[J].Journal of Earthquake Engineer-ing and Engineering Vibration,2000,20(4):30-36.
[8]廖秋林,曾钱帮,刘彤,等.基于ANSYS平台复杂地质体FLAC3D模型的自动生成[J].岩石力学与工程学报,2005,24(6):1010-1013.Liao Q L,Zeng Q B,Liu T,el al.Automatic modelgeneration of complex geologic body with FLAC3Dbased on ANSYS platform[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(6):1010-1013.
[9]Itasca Consulting Group Incorporation.Fast Lan-guage of Continua in Three Dimension[R].Min-neapolis:Itasca Consulting Group Incorporation,1997.
[10]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.Chen Y M,Xu D P.Foundation and Examples ofFLAC/FLAC3D[M].Beijing:China WaterPowerPress,2008.
[11]王自法.汶川大地震震害的启示[R].哈尔滨:中国地震局工程力学研究所,2008.
[12]GB 50157-2003,地铁设计规范[S].
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