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  

EVALUATION OF INTENSITY MEASURES FOR VELOCITY PULSE-LIKE EARTHQUAKE GROUND MOTIONS BASED ON SHEAR TYPE MDOF SYSTEMS

作　　者：周靖[1,2] 陈凯亮[1] 方小丹[2] 

机构地区：[1]湘潭大学土木系,湖南湘潭411105 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《工程力学》2011年第6期149-155,175,共8页Engineering Mechanics

基　　金：教育部博士点基金项目(20094301120001);亚热带建筑科学国家重点实验室基金项目(2010KB13)

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.

关 键 词：地面运动强度表征参数 速度脉冲 多自由度体系 相关性 有效性 

分 类 号：P315.9[天文地球—地震学]