【摘要】 文章提出了一种基于增量动力分析(IDA)定量评定结构延性的方法,通过6层3跨钢筋混凝土(RC)框架算例表明:采用四次多项式函数拟合IDA各时程分析点的最大基底剪力-最大变形系列点,并以IDA倒塌点近似作为延性极限点,能够较好地获取结构动力延性;动力延性同时取决于结构自身特性与荷载过程;结构在20条波下的平均动力延性系数小于静力延性系数。该方法对评定结构的地震延性具有参考价值。更多还原

【Abstract】 In order to quantitatively evaluate structure’s dynamic ductility,the incremental dynamic analysis(IDA)method was used to obtain smooth capability curve of structure in which the discrete response force-deformation points were matched with quartic polynomial,and the IDA collapse point was approximately regarded as ultimate point of ductility definition.Taking a 6-story RC frame as an example,the results were as follows:the dynamic ductility was determined by both structural characteristics and load time history;the average dynamic ductility factor of 20 ground motions was less than the static ductility factor in the given example.This study may have reference value for evaluating seismic ductility of structures.更多还原