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。
Abstract
The correlation between intensity measures (IM) for pulse-like earthquake ground motions and nonlinear deformation demand of single-degree-freedom-systems (SDOF) is researched, and the efficiency of IM is described. Based on dynamic time analysis of SDOF systems subjected to 72 pulse-like ground motions, this work investigates the variation trend of the correlation coefficient between IM for pulse-like ground motions and maximum nonlinear deformation demand of SDOF with the constant-ductility or constant strength system setting. Linear regression analyses are performed on these results to identify the efficiency of peak ground velocity (PGV) and spectral acceleration (Sa(T1)), which is used as IM for pulse-like ground motion. The study shows that IM of pulse-like ground motions depend distinctly on the system period, ductility levels and strength reduction factors have important influence on the correlation and dispersion, and Sa(T1)and PGV are relatively the good IM for pulse-like ground motion.
关键词
地面运动强度表征参数 /
脉冲型 /
单自由度体系 /
相关性 /
有效性
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Key words
ground motion intensity measures /
pulse-like /
single degree freedom system /
correlation /
efficiency
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周靖;陈凯亮;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): 153-158
ZHOU Jing;CHEN Kailiang;LUO Gaojie.
Evaluation of Intensity Measures for Pulse-like Earthquake Ground Motions[J]. Journal of Vibration and Shock, 2010, 29(7): 153-158
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