【摘要】 结构体系的合理性对提高结构在极端灾害下的抗倒塌能力具有非常关键的作用,但目前尚缺少对结构体系合理性和抗倒塌能力的定量化评价方法。本文以结构抗地震倒塌为例,首先对结构的安全储备进行了讨论,指出结构的安全储备包括构件层次的安全储备和整体结构体系安全储备,并对影响结构体系安全储备的因素进行了分析。而后,为了更好地评价整体结构体系的抗地震倒塌安全水平,介绍了近年来国际上趋向采用的基于增量动力分析(IDA)的倒塌储备系数(CMR),并以框架结构为例介绍了用倒塌储备系数衡量整体结构抗倒塌能力的具体方法。更多还原

【Abstract】 Structural system is very important for the collapse resistance of structures under extreme disasters.But currently there is still lack of quantitative evaluation method for structural system.Taking aseismic structures as examples,the safety margins of structures are discussed,and it pointed out that the structural safety margin is made up of safety margin that is beneath the structural element level and the safety margin of global structural system.Factors that may control the safety margin of global structural systems are analyzed then.In order to give a better evaluation for the safety of whole structure,Collapse Margin Ratio(CMR)is introduce,which is based on Incremental Dynamic Analysis(IDA)and is receiving more international focus recently.Frame examples are given to illustrate how to evaluate the structural collapse resistance under Mega-earthquake with CMR.更多还原