基于剪切型结构的速度脉冲地震地面运动强度表征参数评估
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摘要
研究速度脉冲型地震地面运动强度表征参数(IM)与剪切型多自由度(MDOF)体系顶层非线性变形需求的相关性,并分析IM的有效性。采用20条速度大脉冲型地震动记录,基于MDOF体系的非线性动力时程分析,研究恒延性水平(μ)条件下速度脉冲地震动IM与MDOF体系最大非线性顶层位移相关性系数的变化规律;通过线性回归和离差分析,分析速度脉冲地震地面运动强度参数的有效性。分析结果表明:结构基本周期与延性水平对相关性和离散性均有较大影响;峰值地面运动速度(PGV)作为IM,相关性系数较大且离差较小,相关性和离差表现较稳定,是较好的速度脉冲地震动IM。
The correlation between intensity measures(IM) for velocity pulse-like earthquake ground motions and nonlinear deformation demand of shear type multi-degree-freedom(MDOF) systems is researched,and the efficiency of IM is described.Based on the nonlinear dynamic time analysis of MDOF systems subjected to 20 large velocity pulse-like ground motions,this work investigates the variation trend of the correlation coefficient between IM for pulse-like ground motions and maximum nonlinear roof drift demand of MDOF systems with the constant-ductility system setting.Linear regression and dispersion analyses are performed on these results to identify the efficiency of IM for pulse-like ground motions.The study shows that the fundamental period and ductility level of a structure have important influence on the correlation and dispersion.When PGV is used as IM for pulse-like ground motions,the correlation and dispersion is relatively stable with the large relative coefficient and the small dispersion.
The correlation between intensity measures(IM) for velocity pulse-like earthquake ground motions and nonlinear deformation demand of shear type multi-degree-freedom(MDOF) systems is researched,and the efficiency of IM is described.Based on the nonlinear dynamic time analysis of MDOF systems subjected to 20 large velocity pulse-like ground motions,this work investigates the variation trend of the correlation coefficient between IM for pulse-like ground motions and maximum nonlinear roof drift demand of MDOF systems with the constant-ductility system setting.Linear regression and dispersion analyses are performed on these results to identify the efficiency of IM for pulse-like ground motions.The study shows that the fundamental period and ductility level of a structure have important influence on the correlation and dispersion.When PGV is used as IM for pulse-like ground motions,the correlation and dispersion is relatively stable with the large relative coefficient and the small dispersion.
引文
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[2]郝敏,谢礼立,李伟.基于砌体结构破坏损伤的地震烈度物理标准研究[J].地震工程与工程振动,2007,27(5):27―32.Hao Min,Xie Lili,Li Wei.Study on physical measure ofseismic intensity based on damage to masonry structures[J].Journal of Earthquake Engineering and EngineeringVibration,2007,27(5):27―32.(in Chinese)
[3]Akkar S,zen.Effect of peak ground velocity ondeformation demands for SDOF systems[J].EarthquakeEngineering and Structural Dynamics,2005,34(13):1551―1571.
[4]Riddell R,Garcia E J.Hysteretic energy spectrum anddamage control[J].Earthquake Engineering andStructural Dynamics,2001,30(12):1791―1816.
[5]叶列平,马千里,缪志伟.结构抗震分析用地震动强度指标的研究[J].地震工程与工程振动,2009,29(4):9―22.Ye Lieping,Ma Qianli,Miao Zhiwei.Study onearthquake intensities for seismic analysis of structures[J].Journal of Earthquake Engineering and EngineeringVibration,2009,29(4):9―22.(in Chinese)
[6]Bertero V V,Mahin S A,Herrera R A.Seismic designimplication of near-fault San Fernando earthquakerecords[J].Earthquake Engineering and StructuralDynamics,1978,6(1):31―42.
[7]Luco N,Cornell CA.Structure-specific scalar intensitymeasures for near-source and ordinary earthquakeground motions[J].Earthquake Spectra,2007,23(2):357―392.
[8]Baker J W,Cornell C A.Vector-valued intensitymeasures for pulse-like near-fault ground motions[J].Engineering Structures,2008,30(4):1048―1057.
[9]Alavi B.Behavior of moment-resisting frame structuressubjected to near-fault ground motions[J].EarthquakeEngineering and Structural Dynamics,2004,33(6):687―706.
[10]Makris N,Black C J.Evaluation of peak ground velocityas a‘Good'intensity Measure for near-source groundmotions[J].Journal of Engineering Mechanics,2004,130(9):1032―1044.
[11]周靖,陈凯亮,黄靓,罗高杰.速度脉冲型地震地面运动强度表征参数评估[J].振动与冲击,2010,29(7):162―167.Zhou Jing,Chen Kailiang,Huang Liang,Luo Gaojie.Evaluation of intensity measures for pulse-likeearthquake ground motions[J].Journal of Vibration andShock,2010,29(7):162―167.(in Chinese)
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