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为了研究多层屈曲约束支撑钢框架(BRBF)动力响应机理,采用国际上最常见的BRBF结构形式为研究对象,以屈曲约束支撑BRB水平力分担率β为主要研究参数,进行弹塑性动力二阶非线性分析,探讨了层损伤分布机理以及构件持有性能。结果表明:不同地震波的弹性体系能量谱曲线和结构基本周期对应关系影响多层BRBF结构的最大层间位移反应值和BRB的层最大延性比值;地震波加速度时程的随机性对多层BRBF结构动力损伤分布影响明显,尤其多层BRBF结构抗震设计时有必要考虑地震动瞬时能量影响;BRB对结构减震效果明显,随着BRB水平力分担率β值的增加,BRB最大延性比以及最大累积塑性延性比有相应减小的趋势。
In order to study the dynamic response mechanism of multi-level buckling restrained braced steel frames (BRBF), the most common BRBF structure in the world is used as the research object. The buckling restraint BRB horizontal force sharing rate β is the main research parameter, and the elastic-plastic dynamic second order is studied. Nonlinear analysis explores the mechanism of layer damage distribution and component holding performance. The results show that the relationship between the energy spectral curves and the fundamental period of the elastic system of different seismic waves affects the maximum interlayer displacement response of multilayered BRBF structures and the maximum ductility ratio of layers of BRBs; the randomness of the seismic wave acceleration time history is responsible for the structural dynamics of multilayered BRBF. The influence of damage distribution is obvious, especially in the seismic design of multi-story BRBF structures, it is necessary to take into account the influence of instantaneous energy of ground motion; BRB has a significant effect on structural damping, with the increase of BRB horizontal force share β value, BRB maximum ductility ratio and maximum cumulative plasticity. The ductility ratio tends to decrease accordingly.