基于修正力插值纤维单元的汶川地震典型高层建筑震害模拟
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摘要
在非线性阶段,剪力墙构件由于其截面高度比较大,受力极为复杂,仍采用平截面假定将会造成较大的误差。考虑截面剪切变形的修正基于力插值纤维单元(MFBFE),其截面不再是平截面,而是曲面,在剪力墙构件的非线性地震反应分析有较高的精度。基于MFBFE单元对汶川地震中破坏严重的都江堰市电信大楼进行逐步增量时程分析(IDA)。分析结果显示底层和9层是薄弱层,而底层由于各指标基本都为最大值,因此将首先出现破坏,这与震害调查结果基本相符。验证了MFBFE单元在实际结构分析中的合理性和可靠性,为高层建筑结构地震灾变行为研究提供参考。
In shear wall structures, the cross section of shear wall is much wider than that of the beam and the column, thus the assumptions of plane section and zero shear deformation may cause great error in analysis. A modified force-based fiber element(MFBFE) is proposed in this paper, which accounts for the section shear deformation and is capable of accurately predicting the nonlinear deformation of the shear wall. The cross section is a curved surface in the modified element. Nonlinear seismic response analysis of a seriously damage high-rise building by Wenchuan Earthquake in Dujiangyan is performed using the MFBFE shear wall element. Analysis results show that the maximum inter-story drift occurs at the first floor where the damage is serious, which agrees well with the damage survey results. The rationality and reliability of the proposed shear wall element are validated, which provides an effective tool for further research on the seismic behavior of tall buildings.
In shear wall structures, the cross section of shear wall is much wider than that of the beam and the column, thus the assumptions of plane section and zero shear deformation may cause great error in analysis. A modified force-based fiber element(MFBFE) is proposed in this paper, which accounts for the section shear deformation and is capable of accurately predicting the nonlinear deformation of the shear wall. The cross section is a curved surface in the modified element. Nonlinear seismic response analysis of a seriously damage high-rise building by Wenchuan Earthquake in Dujiangyan is performed using the MFBFE shear wall element. Analysis results show that the maximum inter-story drift occurs at the first floor where the damage is serious, which agrees well with the damage survey results. The rationality and reliability of the proposed shear wall element are validated, which provides an effective tool for further research on the seismic behavior of tall buildings.
引文
[1]孙景江.钢筋混凝土剪力墙非线性分析模型综述分析[J].世界地震工程,1994(1):43―46.Sun Jingjiang.Review of models for nonlinear analysis of R/C shear wall[J].World Earthquake Engineering,1994(1):43―46.(in Chinese)
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[4]杜轲,孙景江,刘琛,等.剪力墙非线性分析单元MFBFE的理论及开发[J].工程力学,2014,31(07):137―145.Du Ke,Sun Jingjiang,Liu Chen,et al.Theory and program implementation of MFBFE element for nonlinear analysis of R/C shear wall[J].Engineering Mechanics,2014,31(07):137―145.(in Chinese)
[5]杜轲,孙景江,丁宝荣,等.基于MFBFE剪力墙单元研究及低周反复试验数值分析[J].土木工程学报,2014,47(1):1―12.Du Ke,Sun Jingjiang,Ding Baorong,et al.Numerical analysis for low cyclic loading test of shear wall based on MFBFE shear wall element[J].China Civil Engineering Journal,2014,47(1):1―12.(in Chinese)
[6]解琳琳,黄羽立,陆新征,林楷奇,叶列平.基于Open Sees的RC框架-核心筒超高层建筑抗震弹塑性分析[J].工程力学,2014,31(01):64―71.Xie Linlin,Huang Yuli,Lu Xinzheng,Lin Kiaqi,Ye Lieping.Elasto-plastic analysis for super tall RC frame-core tube structures based on Open Sees[J].Engineering Mechanics,2014,31(01):64―71.(in Chinese)
[7]Mohd Hisham Mohd Yassin.Nonlinear analysis of prestressed concrete structures under monotonic and cycling loads[D].Berkeley:University of California,1994.
[8]Menegotto M,Pinto P E.Method of analysis for cyclically loaded R.C.plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending[R].Lisbon:International Association for Bridge and Structural Engineering,1973.
[9]杜轲,孙景江,刘琛.基于力插值的非线性梁柱单元中固定端部求积节点的积分方法[J].工程力学,2013,30(9):22―27.Du Ke,Sun Jingjiang,Liu Chen.Integration methods for fixed integration point at the end of force-based beam-column elements[J].Engineering Mechanics,2013,30(9):22―27.(in Chinese)
[10]Scott M H,Fenves G L.Plastic hinge integration methods for force-based beam-column elements[J].Journal of Structural Engineering,ASCE,2006,132(2):244―252.
[2]Silvia Mazzoni,Frank Mc Kenna,Michael H.Scott and gregory L.fenves.Open Sees users manual[R].Berkeley:PEER,University of California,2004.
[3]杜轲,孙景江,许卫晓.纤维模型中单元、截面及纤维划分问题研究[J].地震工程与工程振动,2012,32(10):39―46.Du Ke,Sun Jingjiang,Xu Weixiao.The division of element section and fiber in fiber model[J].Earthquake Engineering and Engineering Vibration,2012,32(10):39―46.(in Chinese)
[4]杜轲,孙景江,刘琛,等.剪力墙非线性分析单元MFBFE的理论及开发[J].工程力学,2014,31(07):137―145.Du Ke,Sun Jingjiang,Liu Chen,et al.Theory and program implementation of MFBFE element for nonlinear analysis of R/C shear wall[J].Engineering Mechanics,2014,31(07):137―145.(in Chinese)
[5]杜轲,孙景江,丁宝荣,等.基于MFBFE剪力墙单元研究及低周反复试验数值分析[J].土木工程学报,2014,47(1):1―12.Du Ke,Sun Jingjiang,Ding Baorong,et al.Numerical analysis for low cyclic loading test of shear wall based on MFBFE shear wall element[J].China Civil Engineering Journal,2014,47(1):1―12.(in Chinese)
[6]解琳琳,黄羽立,陆新征,林楷奇,叶列平.基于Open Sees的RC框架-核心筒超高层建筑抗震弹塑性分析[J].工程力学,2014,31(01):64―71.Xie Linlin,Huang Yuli,Lu Xinzheng,Lin Kiaqi,Ye Lieping.Elasto-plastic analysis for super tall RC frame-core tube structures based on Open Sees[J].Engineering Mechanics,2014,31(01):64―71.(in Chinese)
[7]Mohd Hisham Mohd Yassin.Nonlinear analysis of prestressed concrete structures under monotonic and cycling loads[D].Berkeley:University of California,1994.
[8]Menegotto M,Pinto P E.Method of analysis for cyclically loaded R.C.plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending[R].Lisbon:International Association for Bridge and Structural Engineering,1973.
[9]杜轲,孙景江,刘琛.基于力插值的非线性梁柱单元中固定端部求积节点的积分方法[J].工程力学,2013,30(9):22―27.Du Ke,Sun Jingjiang,Liu Chen.Integration methods for fixed integration point at the end of force-based beam-column elements[J].Engineering Mechanics,2013,30(9):22―27.(in Chinese)
[10]Scott M H,Fenves G L.Plastic hinge integration methods for force-based beam-column elements[J].Journal of Structural Engineering,ASCE,2006,132(2):244―252.
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