复杂大型地铁地下车站结构非线性地震反应分析
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摘要
以苏州地铁一号线的星海站为工程背景,对上层为五跨和下层为三跨的地铁车站结构的抗震性能进行数值计算,考虑了土体与混凝土的强非线性特性和土与结构接触非线性特性,分析了结构的层间位移反应特征和结构构件连接部位的应力反应规律,以及结构构件的动态损伤演化规律。研究结果表明:车站结构柱子底端的应力反应大于顶端的应力反应,边柱底端的反应大于中柱底端的反应,下层柱底的应力反应大于上层柱底的应力反应;车站结构的上层侧墙的顶底部结点的应力反应明显比下层侧墙的对应位置结点处的要大;车站结构顶板的中跨端部结点的应力反应明显比侧边跨和侧中跨的要大;车站结构中板的侧中跨端部的应力反应明显比中跨端点处的要大,同时中跨端点处的应力反应又要比侧跨端部的要大;下层右中柱及下层侧墙底部外侧均为破坏最为严重的区域。研究成果对提高该类地铁车站结构抗震性能的认识及其抗震设计水平提供合理的参考与指导。
As far as the Xinghai subway station built in Suzhou city of China is concerned,the earthquake resistant behavior of a large subway station with three spans in the lower floor and five spans in the upper floor is simulated and analyzed by using finite-element method in detail.By considering the spectrum characteristics of ground motions input,the dynamic contact interaction of the interfaces,the nonlinear properties of soils and concrete under dynamic loading and so on,the dynamic horizontal relative displacement among the inter-stories of structure,the stress responses on the component joints of structure and the damage process of structural components are analyzed. The research results show that the stress responses at the bottom of columns seem to be stronger than that at the top of columns,and the stress responses at the bottom of the side columns is obviously stronger than that of the middle columns.Moreover,the stress responses at the bottom of columns on the lower floor are stronger than that on the upper floor.At the same time,the stress responses at the top and bottom of side walls on the upper floor are stronger than that at the corresponding positions on the lower floor.Stress responses at the end of middle spans on the top slab are stronger than that of other spans.The earthquake damage to the right-middle columns and side walls of the lower floor are very seriously.Also,the spectrum characteristics of ground motions input have obvious effect on the earthquake responses of the dynamic interaction system.
As far as the Xinghai subway station built in Suzhou city of China is concerned,the earthquake resistant behavior of a large subway station with three spans in the lower floor and five spans in the upper floor is simulated and analyzed by using finite-element method in detail.By considering the spectrum characteristics of ground motions input,the dynamic contact interaction of the interfaces,the nonlinear properties of soils and concrete under dynamic loading and so on,the dynamic horizontal relative displacement among the inter-stories of structure,the stress responses on the component joints of structure and the damage process of structural components are analyzed. The research results show that the stress responses at the bottom of columns seem to be stronger than that at the top of columns,and the stress responses at the bottom of the side columns is obviously stronger than that of the middle columns.Moreover,the stress responses at the bottom of columns on the lower floor are stronger than that on the upper floor.At the same time,the stress responses at the top and bottom of side walls on the upper floor are stronger than that at the corresponding positions on the lower floor.Stress responses at the end of middle spans on the top slab are stronger than that of other spans.The earthquake damage to the right-middle columns and side walls of the lower floor are very seriously.Also,the spectrum characteristics of ground motions input have obvious effect on the earthquake responses of the dynamic interaction system.
引文
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[3]Jun Seong Choi,Jong She Lee,Member ASCE,Jae Min Kim.Nonlinear earthquake response analysis of 2-D underground structures with soil-structure interaction including separation and sliding at interface[C]//15th ASCE Engineering Mechanics Conference,Columbia University,NewYork,NY,2002:1-8.
[4]Hongbin Huo,Antonio Bobet.Seismic design of cut and cover rectangular tunnels-evaluation of observed behavior of Dakai station during Kobeearthquake,1995[C]//Proceedings of 1st World Forum of Chinese Scholars in Geotechnical Engineering,Tongji University,Shanghai,August 20-22,2003:456-466.
[5]庄海洋,陈国兴.对土体动力粘塑性记忆型嵌套面模型的改进[J].岩土力学,2009,30(1):118-122.ZHUANG Haiyang,CHEN Guoxing.Improvement of dynamic viscoplastic memorial nested yield surface model of soil[J].Rock and Soil Mechan-ics,2009,30(1):118-122.(in Chinese)
[6]庄海洋,陈国兴,梁艳仙,等.土体非线性粘弹性模型及其ABAQUS软件的实现[J].岩土力学,2007,28(3):436-442.ZHUANG Haiyang,CHEN Guoxing,LIANG Yanxian,et al.A developed dynamic viscoelastic constitutive relations of soil and implemented byABAQUS software[J].Rock and Soil Mechanics,2007,28(3):436-442.(in Chinese)
[7]Jeeho Lee,Fenves Gregory L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998(4):892-900.
[8]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299-326.
[9]庄海洋,吴祥祖,陈国兴.考虑初始静应力状态的土-地下结构非线性静动力相互作用研究[J].岩石力学与工程学报,,2011,30(s1):3112-3119ZHUANG Haiyang,WU Xiangzu,CHEN Guoxing.Study of nonlinear static and dynamic coupling interaction of soil-underground structure consider-ing initial static stress[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(s1):3112-3119.(in Chinese)
[10]楼梦麟,陈清军,等.侧向边界对桩基地震反应影响的研究[M].上海:同济大学,1999.LOU Menglin,CHEN Qingjun,et al.Study on pile foundation seismic response due to the influence of lateral boundary[M].Shanghai:Tongji Uni-versity,1999.
[11]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 fable model test of soil-structure system[J].Journal ofEarthquake Engineering and Engineering Vibration,2000,20(2):30-36.(in Chinese)
[12]杨志斌,成竹,任青梅.等效刚度法在动力分析中的应用[J].结构强度研究,2008(1):42-47.YANG Zhibin,CHENG Zhu,REN Qingmei.Application of equivalent stiffness method in dynamic analysis[J].Study on Structural Strength,2008(1):42-47.(in Chinese)
[13]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.ZHUANG Haiyang.Study on nonlinear dynamic soil-underground structure interaction and its large-size shaking table test[D].Nanjing:NanjingUniversity of Technology,2006.(in Chinese)
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