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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 the IMT and the top nonlinear deformation of the MDOF system was studied and the effectiveness of IM was analyzed. Based on the nonlinear dynamic time history analysis of MDOF system, the variation law of the correlation coefficients of the maximum nonlinear top displacement of the IM and MDOF systems under constant ductility level (μ) The validity of velocity pulse ground motion intensity parameters is analyzed by linear regression and dispersion analysis. The results show that the basic period and ductility of structure have great influence on the correlation and dispersion. The peak ground velocity (PGV) is IM, the correlation coefficient is larger and the dispersion is smaller, and the correlation and dispersion are more significant Stable, it is better to speed pulse earthquake IM.