K形偏心支撑钢框架抗地震倒塌概率研究

Research on Seismic Collapse Probability of K-shape EBSFs

采用增量动力分析方法基于FEMA P695抗地震倒塌安全性评估体系,对按我国现行规范设计的8度抗震设防K形偏心支撑钢框架的抗地震倒塌能力进行了研究。结果表明:8度抗震设防K形偏心支撑钢框架,在"大震"作用下,其个体结构倒塌概率小于20%,群体结构(结构类型)倒塌概率小于10%,可提供安全的使用空间,并且结构的CMR随结构层数(高度)增加而减小,因而对高层结构的抗地震倒塌安全性应引起重视,采取更有力的措施防止其在强烈地震下发生倒塌。

The seismic anti-collapse capacity of K-shape eccentrically braced steel frames （EBSFs） in zones of seismic intensity VIII is studied according to seismic collapse assessment system of FEMAP695 and incremental dynamic analysis method. The results show that the collapse probability of single K-shape EBSF is less than 20% and that of the structural type is less than 10% under strong earthquakes, furthermore, the CMRs of K-shape EBSF decrease with the stories of the structures, so that the higher buildings should be designed more elaborately to prevent building collapse.