地震作用下钢筋混凝土框架结构连续倒塌极限状态可靠度分析

将结构连续倒塌的全概率方法应用于地震作用下的结构整体连续倒塌极限状态可靠度分析，采用构件可靠度方法对结构进行地震作用下最可能失效构件的识别，基于改进点估计法的随机Pushdown方法和随机竖向增量动力分析(竖向IDA)方法，进行完好和损伤结构的概率抗竖向连续倒塌能力分析及参数灵敏度分析。采用整体可靠度方法，分析了损伤结构的竖向连续倒塌条件失效概率。基于系统可靠度理论和全概率方法，分析了RC框架结构发生侧向增量倒塌以及构件地震损伤引起的结构竖向连续倒塌的联合失效概率。分析结果表明，按照我国现行规范设计的钢筋混凝土框架结构具有良好的抗连续倒塌能力。

Reliability analysis of progressive collapse limit state of reinforced concrete frame structure under earthquakes

In this paper, the total probability framework of progressive collapse was applied to reliability analysis of progressive collapse of structures under strong earthquakes. The most probable failure members of RC frame structures under strong motions were identified by component reliability method. Two new methods, i.e., the random pushdown method based on an improved point estimate method, and the random vertical incremental dynamic method, were both used for probabilistic global progressive capacity analysis and parameter sensitivity analysis. A global reliability method was used to calculate the conditional probability of progressive collapse of the damaged structures. On the basis of system reliability theory and total probability theorem, the combined failure probability, which incorporates both vertical progressive collapse with the consideration of seismic hazard and lateral incremental collapse, was obtained. It is shown by the results that the RC frames designed according to the current Chinese codes have adequate progressive collapse resistance.