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为提高既有混凝土框架抗震性能,在不显著增加既有结构构件受力的同时,在混凝土框架外部增设钢框架并设置屈曲约束支撑。设计并制作1榀纯混凝土框架和2榀设置附加减震钢框架的混凝土框架,通过低周往复加载试验,研究其开裂和破坏状态、滞回曲线、骨架曲线、刚度退化、等效阻尼比以及钢筋混凝土梁、附加钢框架的应变发展等。试验结果表明:增设附加减震框架后,结构破坏机制更加合理,屈曲约束支撑耗能性能稳定,加固后结构的滞回曲线饱满;采用外部附加钢框架加固钢筋混凝土框架,可提高既有混凝土框架结构的受剪承载能力至3倍以上,既有结构、外部附加钢框架和屈曲约束支撑可协同工作,在设防目标下可避免混凝土柱发生压剪脆性破坏;最后对附加减震框架改进连接构造设计提出了建议。
In order to improve the seismic performance of the existing concrete frame, a steel frame and a buckling restraint support are added to the outside of the concrete frame without significantly increasing the stress of the existing structural members. The concrete frame with 1 榀 pure concrete frame and 2 榀 additional shock-absorbing steel frame was designed and fabricated. The cracking and failure state, hysteresis curve, skeleton curve, stiffness degradation and equivalent damping ratio were studied by low cycle reciprocating loading test Reinforced concrete beams, additional steel frame strain development. The experimental results show that the structure failure mechanism is more reasonable and the energy dissipation performance of the buckling restrained brace is stable, and the hysteretic curve of the structure is full after the additional shock-absorbing frame is added. Reinforcing the reinforced concrete frame with the external additional steel frame can improve the strength of the existing concrete frame The shear capacity of the structure is more than 3 times. The existing structure, the external steel frame and the buckling restraint support can work together to avoid the brittle fracture of the concrete column under the target of fortification. Finally, Design made recommendations.