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中文摘要：
增量动力分析（Incremental Dynamic Analysis,IDA）作为静力Pushover分析的动力拓展,可以全面、准确地分析结构的性能变化,尤其可以很好地分析结构倒塌这一动力失稳问题。本文基于单地震动记录的IDA方法,提出了＂折半取中＂原则,以确定结构倒塌极限状态点。以一榀五层三跨钢筋混凝土框架结构为例,分别考虑钢筋强化模型、理想弹塑性模型和软化模型,对其进行倒塌分析。结果表明：钢筋的屈服后强化特性对结构抗倒塌能力具有显著的影响。
英文摘要：
Incremental Dynamic Analysis（IDA） is the dynamic extension of static pushover analysis,which can estimate the structural performance thoroughly and exactly,especially for the structural collapse state,which is the dynamic instability problem in essence.This paper proposes a ＂Half-in-One＂ rule for single-record IDA method to determine the collapse limit state point of structures.A three-bay,five-storey RC frame is taken as the example to apply the method proposed in this paper.Three kinds of constitutive relationships of steel are considered,including the harden model,the ideal elastic-plastic one and the soften one.It is found by the numerical example that the harden behavior of steel has significant effects on the collapse-resistant capacity of structures.
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