钢筋混凝土框架结构侧向倒塌地震易损性分析

Lateral seismic collapse fragility analysis of RC frame structures

为研究钢筋混凝土框架结构在地震作用下的侧向倒塌易损性,采用多地震动增量动力分析方法,用FEMA准则和结构有限元计算失稳作为结构侧向倒塌能力点的确定准则,分析得到一栋5层3跨钢筋混凝土框架结构的侧向倒塌易损性曲线.结果表明:FEMA准则对结构侧向倒塌定义偏于保守.在大震作用下,结构倒塌风险较小.

To study the lateral seismic collapse fragility of RC frame structures,multi-record incremental dynamic analysis method is utilized to get the lateral seismic collapse fragility curves of a three-bay and five-storey RC frame building,in which the FEMA-rule and computational non-convergence are taken as a rule of lateral collapse of structures.The results demonstrate that the FEMA-rule is conservative to determine lateral collapse.Under the major earthquake,the structural collapse risk is limited.