结构抗倒塌能力简化评估方法及其应用  

A simplified evaluation method of structural collapse resistant capacity and its application

作　　者：梁仁杰[1,2] 吴京[1] 章丛俊[3] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]东南大学建筑设计研究院有限公司,江苏南京210096 [3]南京工程学院建筑工程学院,江苏南京211167

出　　处：《建筑结构学报》2015年第6期13-18,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(51278105);江苏省青蓝工程

摘　　要：针对增量动力分析(IDA)计算实际结构倒塌时常会遇到的工作量大、数值收敛困难等问题,提出结构抗倒塌能力的简化评估方法。该方法根据Pushover曲线与IDA曲线在定义结构倒塌极限状态上的相关性,通过单向和往复的Pushover分析确定结构的骨架参数和滞回特性,构建倒塌分析的等效单自由度模型,快速计算结构的倒塌强度。对一榀三跨六层钢框架和一榀三跨六层混凝土框架进行分析,结果显示简化方法得到的响应曲线和倒塌易损性曲线与IDA的结果接近,可以近似评估以第1振型为主的结构的抗倒塌能力。Due to the high calculation cost and convergence problem in the numerical simulation of actual structures under earthquakes using incremental dynamic analysis( IDA) method,a simplified evaluation method of structural collapse resistant capacity is proposed. The simplified method is based on the correlation between the Pushover curve and the IDA curve in the collapse limit state. According to the results of Pushover analysis,where the backbone curve and hysteretic characteristic are determined by the unidirectional and reciprocating Pushover analysis,the equivalent single-degree-of-freedom model for collapse analysis is established. The numerical simulations of a six-story three-span steel frame and a six-story three-span RC frame show that the structural response curve and collapse fragility curve calculated by the simplified method agree with those by IDA,which indicates that the simplified method can be used to evaluate the collapse resistant capacity of structure dominating by the first mode.

关 键 词：抗倒塌能力 倒塌易损性 增量动力分析 推覆分析 评估方法 

分 类 号：TU312[建筑科学—结构工程]