地铁车站结构的地震能量反应
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摘要
将地基土-地铁车站结构体系视为平面应变问题,采用Davidenkov动力本构模型和动塑性损伤模型,分别模拟土体和车站结构混凝土的动力特性,研究了中远场地震动和近断层地震动作用下地铁车站结构的能量反应特征.结果表明,地铁车站结构的阻尼耗能和滞回耗能随地震动作用时间单调增加,输入地震动特性对地铁车站结构的能量反应特征有显著影响;中柱的滞回耗能分布沿结构层间自下向上依次减少;侧墙的滞回耗能主要分布在顶层和底层;梁板的滞回耗能分布较为均匀,但顶板的耗能相对较多;中柱的滞回能量耗散最为集中,在地铁车站结构的抗震设计中应加强中柱的抗震措施.
Considering the influence of soil-station structure on the 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled,where a dynamic Davidenkov model is used to model dynamic characteristics of soils and a plastic-damage model is used to model dynamic characteristics of station structure concrete.The energy response of the station structure is analyzed under middle-far field ground motion and near-fault ground motion.Results show that damping energy and hysteretic energy monotone increase under ground motion,and the ground motion characteristics impact on the energy response of the station structure.The hysteretic energy of columns successively decreases from the bottom to the top,the hysteretic energy of sidewalls is mainly distributed in the bottom and the top.The distribution of hysteretic energy of beam slabs is relatively even,and the hysteretic energy of roof is relatively more.Furthermore,concentration effect of hysteretic energy of the structure is measured by hysteretic energy density.It is found that the hysteretic energy is the most centralized in the column.A seismic measurement of the columns must be promoted in the seismic design of subway station structure.
Considering the influence of soil-station structure on the 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled,where a dynamic Davidenkov model is used to model dynamic characteristics of soils and a plastic-damage model is used to model dynamic characteristics of station structure concrete.The energy response of the station structure is analyzed under middle-far field ground motion and near-fault ground motion.Results show that damping energy and hysteretic energy monotone increase under ground motion,and the ground motion characteristics impact on the energy response of the station structure.The hysteretic energy of columns successively decreases from the bottom to the top,the hysteretic energy of sidewalls is mainly distributed in the bottom and the top.The distribution of hysteretic energy of beam slabs is relatively even,and the hysteretic energy of roof is relatively more.Furthermore,concentration effect of hysteretic energy of the structure is measured by hysteretic energy density.It is found that the hysteretic energy is the most centralized in the column.A seismic measurement of the columns must be promoted in the seismic design of subway station structure.
引文
[1]HOUSNER G W.Limit design of structures to resist earthquakes[C]∥Proceedings of the First World Conference onEarthquake Engineering.Berkeley,1956,5:1-11.
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[3]UANG C M,BERTERO V V.Use of energy as a design criterion in earthquake-resistant design[R]∥Berkeley:EarthquakeEngineering Research Center,University of California,1988.
[4]MICHEL B,WANG N.Some aspects of energy methods for the inelastic seismic response of ductile SDOF structures[J].Engineering Structures,1996,18(1):1-12.
[5]WONG K K F,YANG R.Earthquake response and energy evaluation of inelastic structures[J].Journal of EngineeringMechanics,2002,128(3):308-317.
[6]陈国兴,庄海洋.基于Davidenkov骨架曲线的土体动力本构关系及其参数研究[J].岩土工程学报,2005,27(8):860-864.CHEN Guo-xing,ZHUANG Hai-yang.Developed nonlinear dynamic constitutive relations of soils based on Davidenkovskeleton curve[J].Chinese Journal of Geotechnical Engineering,2005,27(8):860-864.(in Chinese)
[7]左熹,杨树才,陈国兴.地铁车站结构非线性地震损伤演化规律分析[J].工程抗震与加固改造,2010,32(1):110-116.ZUO Xi,YANG Shu-cai,CHEN Guo-xing.Analysis on evolution of nonlinear seismic damage of subway station structure[J].Earthquake Resistant Engineering and Retrofitting,2010,32(1):110-116.(in Chinese)
[8]LEE J,FENVES G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900.
[2]ZAHRAH T F,HALL W J.Earthquake energy absorption in SDOF structures[J].Journal of Structural Engineering,1984,110(8):1757-1772.
[3]UANG C M,BERTERO V V.Use of energy as a design criterion in earthquake-resistant design[R]∥Berkeley:EarthquakeEngineering Research Center,University of California,1988.
[4]MICHEL B,WANG N.Some aspects of energy methods for the inelastic seismic response of ductile SDOF structures[J].Engineering Structures,1996,18(1):1-12.
[5]WONG K K F,YANG R.Earthquake response and energy evaluation of inelastic structures[J].Journal of EngineeringMechanics,2002,128(3):308-317.
[6]陈国兴,庄海洋.基于Davidenkov骨架曲线的土体动力本构关系及其参数研究[J].岩土工程学报,2005,27(8):860-864.CHEN Guo-xing,ZHUANG Hai-yang.Developed nonlinear dynamic constitutive relations of soils based on Davidenkovskeleton curve[J].Chinese Journal of Geotechnical Engineering,2005,27(8):860-864.(in Chinese)
[7]左熹,杨树才,陈国兴.地铁车站结构非线性地震损伤演化规律分析[J].工程抗震与加固改造,2010,32(1):110-116.ZUO Xi,YANG Shu-cai,CHEN Guo-xing.Analysis on evolution of nonlinear seismic damage of subway station structure[J].Earthquake Resistant Engineering and Retrofitting,2010,32(1):110-116.(in Chinese)
[8]LEE J,FENVES G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900.
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