地铁车站结构非线性地震损伤演化规律分析
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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,建立了土-地铁车站非线性动力相互作用的有限元分析模型,分别研究了在中远场地震动和近断层地震动作用下地铁车站结构的塑性损伤行为,得出结构内部损伤场的分布,用损伤指数分别衡量结构局部和整体的损伤程度,并分析了在地铁结构非线性损伤演化规律。结果表明:地铁车站结构的损伤破坏区域主要是中柱的顶部和底部,不同楼层的中柱损伤破坏存在差异,局部和整体损伤指数时程变化规律一致,在变形累积效应下表现出非减特性。
Considering the influence of soil-station structure interaction for 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled.In the modeling,dynamic Davidenkov model is used to model dynamic characteristics of soils,and plastic-damage model is used to model dynamic characteristics of station structure concrete.Based on the reseach of plastic damage of station structure under middle-far field seismic action and near-fault seismic action,the damage zone of concrete structure is discovered,and then,the local and global damage degree of structrue is measured by damage index.Furthermore,the nonlinear damage evolution law of station structure is analysed.The result shows that the damage zone of station structure is the top and bottom of column,and damage situation is different between different floors.The law of local and global damage index is consistent essentially,and the damage index is increased with the efffet of accumulative deformation.
Considering the influence of soil-station structure interaction for 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled.In the modeling,dynamic Davidenkov model is used to model dynamic characteristics of soils,and plastic-damage model is used to model dynamic characteristics of station structure concrete.Based on the reseach of plastic damage of station structure under middle-far field seismic action and near-fault seismic action,the damage zone of concrete structure is discovered,and then,the local and global damage degree of structrue is measured by damage index.Furthermore,the nonlinear damage evolution law of station structure is analysed.The result shows that the damage zone of station structure is the top and bottom of column,and damage situation is different between different floors.The law of local and global damage index is consistent essentially,and the damage index is increased with the efffet of accumulative deformation.
引文
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[10]王道荣.高速侵彻现象的工程分析方法和数值模拟研究[D].合肥:中国科学技术大学,2002Wang D R.Study on engineering analytical model and numerical simulation on hypervelocity penetration[D].Hefei:University of Science and Technology of China,2002(in Chinese)
[2]谢和平,岩石.混凝土损伤力学[M].北京:中国矿业大学出版社,1990Xie H P,Yan S.Damage Mechanics of Concrete[M]Beijing:China University of Mining and Technology Press,1990(in Chinese)
[3]Lubliner J,Oliver J,Oller S,et al.A Plastic-Damage Model for Concrete[J].International Journal of Solids and Structures,1989,26(3):299～326
[4]Lee J,Fenves G L.Plastic-Damage Model for Cyclic Loading of Concrete Structures[J].Journal of Engineering Mechanics,1998,124(8):892～900
[5]Barbat A H,Oller S,Onate E,et al.Viscous Damage Model for Timoshenko Beam Structures[J].International Journal of Solids and Structures,1997,34(30):3953～3976
[6]Hanganu A D,Onate E,Barbat A H.A Finite Element Methodology for Local/Global Damage Evaluation in Civil Engineering Structures[J].Computers and Structures,2002,80(12):1667～1687
[7]吴波,欧进萍.钢筋砼结构在主余震作用下的反应与损伤分析[J].建筑结构学报,1993,14(5):45～53Wu B,Ou J P.Response and damage analysis of reinforced concrete structures under main shock and aftershocks[J].Journal of Building Structures,1993,14(5):45～53(in Chinese)
[8]沈新普,冯金龙,杨璐,等.混凝土结构损伤过程区几何特性数值研究[J].岩石力学与工程学报,2008,27(s1):3261～3273Shen X P,Feng J L,Yang L,et al.Numerical investigation on size of damage process zone of concrete structures[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(s1):3261～3273(in Chinese)
[9]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):860～864Chen G X,Zhuang H Y.Developed nonlinear dynamic constitutive relations of soils based on Davidenkov skeleton curve[J].Chinese Jounal of Geotechnical Engineering,2005,27(8):860～864(in Chinese)
[10]王道荣.高速侵彻现象的工程分析方法和数值模拟研究[D].合肥:中国科学技术大学,2002Wang D R.Study on engineering analytical model and numerical simulation on hypervelocity penetration[D].Hefei:University of Science and Technology of China,2002(in Chinese)
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