【摘要】 为了量化结构抗震能力与结构抗震强度需求的关系,文中从理论上分析了强度折减系数与地震动参数和结构特征参数间的关系;通过弹塑性动力时程分析,研究了单自由度体系在地震作用下不同场地类别、位移延性水准、自振周期以及阻尼比对强度折减系数的影响.结果表明,以上参数对强度折减系数的影响十分显著.文中还基于不同场地类别中强度折减系数的统计平均值,通过非线性回归分析给出了单自由度体系抗震强度折减系数谱的简单公式,从而为基于位移的抗震设计提供了有益的参考.更多还原

【Abstract】 In order to quantify the relationship between the seismic capacity and the seismic strength demand of a structure,this paper theoretically analyzes the relationships between the strength-reduction factor on the one hand and the ground motion parameter & the structural characteristic parameter on the other.The great effects of site conditions,displacement ductility,self-vibration period and damping ratio on the strength-reduction factor of a single-DOF(Degree of Freedom) system in earthquake action are investigated.Moreover,simplified expressions for the strength-reduction factor spectra of a single-DOF system are proposed by a nonlinearly regressive analysis of the statistic averages of strength-reduction factors in different site conditions.The results of the present study provide a valuable reference for the displacement-based seismic design of buildings.更多还原