单向偏心结构的简化增量动力分析方法
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摘要
增量动力分析方法(IDA)可以较为全面的评估结构的抗震性能,但需对结构进行大量的非线性时程分析,计算量巨大。该文将单向偏心结构的等效二自由度模型(EDDOF)应用于增量动力时程分析,提出了单向偏心结构的简化增量动力分析方法。然后选取20条实际地震记录和一栋5层偏心结构,基于等效二自由度模型和原型模型分别进行了增量动力时程分析,并比较分析了对应的IDA曲线和易损性曲线。结果表明:该文方法对单向偏心结构抗震性能评估有较高的精度,可以追踪结构从弹性阶段到防止倒塌各阶段的性态变迁全过程,并进行定量评估,且计算效率大幅提高。
The incremental dynamic analysis(IDA) method is a good tool to evaluate the seismic performance of structures.However,it is computationally expensive to conduct inelastic dynamic analysis.In this study,a simplified incremental dynamic analysis method is proposed for the seismic evaluation of plan-asymmetric structures by introducing the equivalent dual degree of freedom(EDDOF) model into the process.With 20 ground motions and a 5-story plan-asymmetric frame structure,the incremental dynamic analysis is performed based on the original structures and the corresponding EDDOF system.The IDA curves and the collapse fragility curves are compared for the two methods.It can be concluded that the simplified IDA method is reliable and effective for evaluating the seismic performance of uniaxial plan-asymmetric structures from elastic behavior to global dynamic collapse.And the proposed procedure also has good efficiency.
The incremental dynamic analysis(IDA) method is a good tool to evaluate the seismic performance of structures.However,it is computationally expensive to conduct inelastic dynamic analysis.In this study,a simplified incremental dynamic analysis method is proposed for the seismic evaluation of plan-asymmetric structures by introducing the equivalent dual degree of freedom(EDDOF) model into the process.With 20 ground motions and a 5-story plan-asymmetric frame structure,the incremental dynamic analysis is performed based on the original structures and the corresponding EDDOF system.The IDA curves and the collapse fragility curves are compared for the two methods.It can be concluded that the simplified IDA method is reliable and effective for evaluating the seismic performance of uniaxial plan-asymmetric structures from elastic behavior to global dynamic collapse.And the proposed procedure also has good efficiency.
引文
[1]Vamvatsikos D,Cornell C A.Incremental dynamicanalysis[J].Earthquake Engineering and StructuralDynamics,2002,31(3):491―514.
[2]Vamvatsikos D,Cornell C A.Applied incrementaldynamic analysis[J].Earthquake Spectra,2004,20(2):523―553.
[3]Elnashai A S.Do we really need inelastic dynamicanalysis[J].Journal of Earthquake Engineering,2002,6(1):123―130.
[4]Vamvatsikos D,Cornell C A.Developing efficient scalarand vector intensity measures for IDA capacityestimation by incorporating elastic spectral shapeinformation[J].Earthquake Engineering and StructuralDynamics,2005,34(13):1573―1600.
[5]杨成,徐腾飞,李英民,杨溥.应用弹塑性反应谱对IDA方法的改进研究[J].地震工程与工程振动,2008,28(4):64―69.Yang Cheng,Xu Tengfei,Li Yingmin,Yang Pu.Research on modified IDA method by inelastic responsespectrum[J].Journal of Earthquake Engineering andEngineering Vibration,2008,28(4):64―69.(in Chinese)
[6]Han S W,Chopra A K.Approximate incrementaldynamic analysis using the modal pushover analysisprocedure[J].Earthquake Engineering and StructuralDynamics,2006,35(15):1853―1873.
[7]徐燕,胡世德.钢管混凝土拱桥的动力稳定极限承载力研究[J].土木工程学报,2006,39(9):68―73.Xu Yan,Hu Shide.A study on the dynamic ultimatecapacity of CFST arch bridges[J].China CivilEngineering Journal,2006,39(9):68―73.(in Chinese)
[8]马千里,叶列平,陆新征,缪志伟.采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究[J].建筑结构学报,2008,29(2):132―140.Ma Qianli,Ye Lieping,Lu Xinzheng,Miao Zhiwei.Study on lateral load patterns of pushover analysis usingincremental dynamical analysis for RC frame structures[J].Journal of Building Structures,2008,29(2):132―140.(in Chinese)
[9]Lucchini A,Monti G,Kunnath S.Seismic behavior ofsingle-story asymmetric-plan buildings under uniaxialexcitation[J].Earthquake Engineering and StructuralDynamics,2009,38(9):1053―1070.
[10]李宁,翟长海,谢礼立.基于MPA的单向偏心结构性态评估方法[J].哈尔滨工业大学学报,2009,41(8):30―34,78.Li Ning,Zhai Changhai,Xie Lili.Performanceevaluation procedure based on MPA method foruni-directional eccentric structures[J].Journal of HarbinInstitute of Technology,2009,41(8):30―34,78.(inChinese)
[11]Suita K,Yamada S,Tada M,Matsuoka Y,Sato E.E-Defence tests on full-scale steel buildings:Part 2collapse experiments on moment frames[C]//StructuralEngineering Research Frontiers,ASCE,Long Beach,CA:WALLACE JW,2007.
[2]Vamvatsikos D,Cornell C A.Applied incrementaldynamic analysis[J].Earthquake Spectra,2004,20(2):523―553.
[3]Elnashai A S.Do we really need inelastic dynamicanalysis[J].Journal of Earthquake Engineering,2002,6(1):123―130.
[4]Vamvatsikos D,Cornell C A.Developing efficient scalarand vector intensity measures for IDA capacityestimation by incorporating elastic spectral shapeinformation[J].Earthquake Engineering and StructuralDynamics,2005,34(13):1573―1600.
[5]杨成,徐腾飞,李英民,杨溥.应用弹塑性反应谱对IDA方法的改进研究[J].地震工程与工程振动,2008,28(4):64―69.Yang Cheng,Xu Tengfei,Li Yingmin,Yang Pu.Research on modified IDA method by inelastic responsespectrum[J].Journal of Earthquake Engineering andEngineering Vibration,2008,28(4):64―69.(in Chinese)
[6]Han S W,Chopra A K.Approximate incrementaldynamic analysis using the modal pushover analysisprocedure[J].Earthquake Engineering and StructuralDynamics,2006,35(15):1853―1873.
[7]徐燕,胡世德.钢管混凝土拱桥的动力稳定极限承载力研究[J].土木工程学报,2006,39(9):68―73.Xu Yan,Hu Shide.A study on the dynamic ultimatecapacity of CFST arch bridges[J].China CivilEngineering Journal,2006,39(9):68―73.(in Chinese)
[8]马千里,叶列平,陆新征,缪志伟.采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究[J].建筑结构学报,2008,29(2):132―140.Ma Qianli,Ye Lieping,Lu Xinzheng,Miao Zhiwei.Study on lateral load patterns of pushover analysis usingincremental dynamical analysis for RC frame structures[J].Journal of Building Structures,2008,29(2):132―140.(in Chinese)
[9]Lucchini A,Monti G,Kunnath S.Seismic behavior ofsingle-story asymmetric-plan buildings under uniaxialexcitation[J].Earthquake Engineering and StructuralDynamics,2009,38(9):1053―1070.
[10]李宁,翟长海,谢礼立.基于MPA的单向偏心结构性态评估方法[J].哈尔滨工业大学学报,2009,41(8):30―34,78.Li Ning,Zhai Changhai,Xie Lili.Performanceevaluation procedure based on MPA method foruni-directional eccentric structures[J].Journal of HarbinInstitute of Technology,2009,41(8):30―34,78.(inChinese)
[11]Suita K,Yamada S,Tada M,Matsuoka Y,Sato E.E-Defence tests on full-scale steel buildings:Part 2collapse experiments on moment frames[C]//StructuralEngineering Research Frontiers,ASCE,Long Beach,CA:WALLACE JW,2007.
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