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进行了两个3层、4×2跨的钢筋混凝土空间框架模型的连续倒塌试验,模型1的初始失效柱是底层长边中柱,模型2的初始失效柱是底层角柱。模型不考虑抗震要求,以机械千斤顶替换初始失效柱,通过机械千斤顶的分级卸载模拟柱的初始失效。观测并分析了两个试验模型的抗力-位移曲线、结构受力机制及结构抗连续倒塌能力。分析表明,对于模型1,结构抗连续倒塌机制包含梁机制和悬链线机制;对于模型2,结构抗连续倒塌机制仅为梁机制。
Two consecutive 3-story, 4 × 2-span RC frame model tests were carried out. The initial failure mode of model 1 was the bottom long-side center column, and the initial failure mode of model 2 was the bottom-corner corner column. The model does not consider the seismic requirements, replaces the initial failure column with a mechanical jack, and initial failure of the simulation column by unloading the mechanical jack. The resistance-displacement curves, structural stress mechanism and anti-collapse ability of the two structures were observed and analyzed. The analysis shows that for model 1, the mechanism of anti-continuous collapse mechanism includes the beam mechanism and catenary mechanism; for model 2, the mechanism of anti-continuous collapse mechanism is only the beam mechanism.