速度脉冲型地震地面运动强度表征参数评估
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摘要
研究强速度脉冲型地震地面运动强度表征参数(IM)与单自由度(SDOF)体系非线性变形需求的相关性,并分析IM的有效性。采用72条速度脉冲型地震记录,基于SDOF体系的动力时程分析,研究了恒延性水平(μ)和恒强度折减系数(R)条件下脉冲型地面运动IM与最大非线性变形相关性系数的变化规律;通过线性回归和离差分析,研究了加速度反应谱(Sa(T1))和峰值地面运动速度(PGV)作为脉冲型地面运动IM的有效性。分析结果表明,脉冲型地面运动IM对体系周期有很强的依赖性,μ和R对相关性和离散性均有很大影响,Sa(T1)和PGV是相对较优的脉冲型地面运动IM。
The correlation between intensity measures (IM) of pulse-like earthquake ground motions and nonlinear deformation demand of single-degree-of-freedom (SDOF) systems was studied,and the efficiency of IM was described.Based on dynamic time history analysis of SDOF systems subjected to 72 pulse-like ground motions,the variation trend of the correlation coefficient between IM of pulse-like ground motions and the maxium nonlinear deformation demand of SDOF systems with the constant-ductility or constant strength system setting was investigated.Linear regression analyses were performed on these results to identify the efficiency of peak ground velocity (PGV) and spectral acceleration (Sa(T1)) used as IMs of pulse-like ground motion.The study showed that IM of pulse-like ground motions depends strongly on the system's period;ductility level and strength reduction factors have important influence on the correlation and dispersion;and Sa(T1)and PGV are better IMs of pulse-like ground motion.
The correlation between intensity measures (IM) of pulse-like earthquake ground motions and nonlinear deformation demand of single-degree-of-freedom (SDOF) systems was studied,and the efficiency of IM was described.Based on dynamic time history analysis of SDOF systems subjected to 72 pulse-like ground motions,the variation trend of the correlation coefficient between IM of pulse-like ground motions and the maxium nonlinear deformation demand of SDOF systems with the constant-ductility or constant strength system setting was investigated.Linear regression analyses were performed on these results to identify the efficiency of peak ground velocity (PGV) and spectral acceleration (Sa(T1)) used as IMs of pulse-like ground motion.The study showed that IM of pulse-like ground motions depends strongly on the system's period;ductility level and strength reduction factors have important influence on the correlation and dispersion;and Sa(T1)and PGV are better IMs of pulse-like ground motion.
引文
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[3]Akkar S,zen.Effect of peak ground velocity on deformation demands for SDOF systems[J].Earthquake Engineering and Structural Dynamics,2005,34(13):1551-1571.
[4]Nicolas L,Allin C C.Structure-specific scalar intensity meas-ures for near-source and ordinary earthquake ground motions[J].Earthquake Spectra,2007,23(2):357-392.
[5]Makris N,Black C J.Evaluation of Peak Ground Velocity as a“Good”Intensity Measure for Near-Source Ground Motions[J].Journal of Engineering Mechanics,2004,130(9):1032-1044.
[6]Yakut A,Yllmaz H.Correlation of deformation demands with ground motion intensity[J].Journal of structural Engineer-ing,2008,134(2):1818-1828.
[7]Baker J W,Cornell C A.Vector-valued intensity measures for pulse-like near-fault ground motions[J].Engineering Struc-tures,2008,30(4):1048-1057.
[8]Tothong P,Cornell C A.Structural performance assessment under near-source pulse-like ground motions using advanced ground motion intensity measures[J].Earthquake Engineer-ing and Structural Dynamics,2008,37(7):1013-1037.
[9]王建民,朱
[2].地面运动强度度量参数与双线性单自由度系统变形需求的相关性研究[J].地震学报,2006,28(1):76-84.
[10]李爽,谢礼立,郝敏.地震动参数及结构整体破坏相关性研究[J].哈尔滨工业大学学报,2007,39(4):505-509.
[11]Malhotra P K.Response of buildings to near-field pulse-like ground motions[J].Earthquake Engineering and Structural Dynamics,1999,28(11):1309-1326.
[12]Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismolog-ical Society of America,2007,97(5):1486-1501.
[13]http://stanford.edu/～bakerjw/pulse-classification.html,2009,02,20.
[14]Giovenale P,Cornell C A,Esteva L.Comparing the adequa-cy of alternative ground motion intensity measures for the esti-mation of structural responses[J].Earthquake Engineering and Structural Dynamics,2004,33(8):951-979.
[2]Krawinkler H,Medina R,Alavi B.Seismic drift and ductility demands and their dependence on ground motions[J].Engi-neering Structures,2003,25(5):637-653.
[3]Akkar S,zen.Effect of peak ground velocity on deformation demands for SDOF systems[J].Earthquake Engineering and Structural Dynamics,2005,34(13):1551-1571.
[4]Nicolas L,Allin C C.Structure-specific scalar intensity meas-ures for near-source and ordinary earthquake ground motions[J].Earthquake Spectra,2007,23(2):357-392.
[5]Makris N,Black C J.Evaluation of Peak Ground Velocity as a“Good”Intensity Measure for Near-Source Ground Motions[J].Journal of Engineering Mechanics,2004,130(9):1032-1044.
[6]Yakut A,Yllmaz H.Correlation of deformation demands with ground motion intensity[J].Journal of structural Engineer-ing,2008,134(2):1818-1828.
[7]Baker J W,Cornell C A.Vector-valued intensity measures for pulse-like near-fault ground motions[J].Engineering Struc-tures,2008,30(4):1048-1057.
[8]Tothong P,Cornell C A.Structural performance assessment under near-source pulse-like ground motions using advanced ground motion intensity measures[J].Earthquake Engineer-ing and Structural Dynamics,2008,37(7):1013-1037.
[9]王建民,朱
[2].地面运动强度度量参数与双线性单自由度系统变形需求的相关性研究[J].地震学报,2006,28(1):76-84.
[10]李爽,谢礼立,郝敏.地震动参数及结构整体破坏相关性研究[J].哈尔滨工业大学学报,2007,39(4):505-509.
[11]Malhotra P K.Response of buildings to near-field pulse-like ground motions[J].Earthquake Engineering and Structural Dynamics,1999,28(11):1309-1326.
[12]Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismolog-ical Society of America,2007,97(5):1486-1501.
[13]http://stanford.edu/～bakerjw/pulse-classification.html,2009,02,20.
[14]Giovenale P,Cornell C A,Esteva L.Comparing the adequa-cy of alternative ground motion intensity measures for the esti-mation of structural responses[J].Earthquake Engineering and Structural Dynamics,2004,33(8):951-979.
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