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钢筋混凝土结构易损性的研究大多数集中于地震烈度或地震动峰值加速度上(PGA),地震动的选取亦没有考虑近远场地震的不同,且对于房屋建筑的研究较少。因此综合考虑地震动峰值加速度及阻尼比为5%的谱加速度,考虑近场及远场地震的不同性质,对一钢筋混凝土框架房屋进行地震易损性分析。定义了结构整体的4个极限破坏状态,提出了基于结构极限破坏状态确定结构抗震性能水平的方法。最后基于增量动力分析(IDA)的结果,采用该方法对结构进行基于性能的地震易损性分析,得到结构的易损性曲线,对结构在不同IM参数及不同地震动下的易损性能进行评估和对比分析。从而可以根据结构的实际地震需求从概率意义上判断结构所处的地震破坏状态,为今后震害预测提供了参考。
Most of the studies on the vulnerability of reinforced concrete structures focus on seismic intensity or peak acceleration of ground motions (PGA), and the selection of ground motions does not take into account the different near-far-field earthquakes, and less studies on building construction. Therefore, considering the peak acceleration of ground motions and the spectral acceleration with damping ratio of 5%, considering the different nature of near-field and far-field earthquakes, the seismic fragility of a RC frame house is analyzed. The four ultimate failure states of the structure are defined, and the method of determining the seismic performance of the structure based on the ultimate failure state of the structure is proposed. Finally, based on the results of incremental dynamic analysis (IDA), this method is used to analyze the performance-based seismic vulnerability of the structure and to obtain the vulnerability curve of the structure. The vulnerability of the structure under different IM parameters and different ground motions Conduct assessment and comparative analysis. According to the actual seismic demand of the structure, the damage state of the earthquake in which the structure is located can be judged from the probability, which provides a reference for the future earthquake damage prediction.