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结构抗倒塌能力谱的建立和应用是基于一致倒塌风险抗震设计方法的关键。结合静力推覆分析和基于增量动力分析的倒塌易损性分析,提出基于单自由度体系的多层钢筋混凝土框架倒塌易损性预测方法。首先,介绍基于增量动力分析的倒塌易损性分析。然后,阐述将原结构通过静力推覆分析等效为单自由度体系的方法和步骤,进而利用等效单自由度体系的倒塌易损性分析结果估计原结构的抗地震倒塌能力;最后,通过40个不同结构参数的多层规则钢筋混凝土框架算例,验证建议方法的适用性和准确性。研究表明:基于单自由度体系的多层钢筋混凝土框架倒塌易损性预测方法的计算量小,且能够对多层钢筋混凝土框架的抗倒塌能力做出保守估计;同时建议方法将原钢筋混凝土结构的抗倒塌能力与等效单自由度体系的抗倒塌能力建立定量关系,为抗倒塌能力谱的应用奠定了理论基础。
The establishment and application of structural collapse resistance spectrum is the key to the seismic design method based on the risk of collapse. Combined with static nappe analysis and collapse vulnerability analysis based on incremental dynamic analysis, a prediction method of collapse vulnerability of multi-story RC frame based on single degree of freedom is proposed. First, the collapse vulnerability analysis based on incremental dynamic analysis is introduced. Then, the methods and steps of equivalently deducing the original structure through the static pushover analysis as single degree of freedom system are described, and then the collapsible vulnerability analysis results of the equivalent single degree of freedom system are used to estimate the anti-seismic collapse ability of the original structure. Finally, Through the example of 40-story RC frame with different structural parameters, the applicability and accuracy of the proposed method are verified. The results show that the method of predicting the collapse vulnerability of multi-story RC frames based on single degree of freedom is less computationally intensive and can make a conservative estimate of the anti-collapse capability of RC frames. The proposed method combines the original RC structure And the anti-collapse ability of equivalent one-degree-of-freedom system, which establishes the theoretical foundation for the application of anti-collapse capacity spectrum.