附加减震钢框架的加固混凝土框架结构抗震性能试验研究

发布时间：2019-01-10 20:00

【摘要】：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。
[Abstract]:In order to improve the seismic behavior of the existing concrete frame, the steel frame and buckling restrained braces are added outside the concrete frame while the force of the existing structural member is not significantly increased. A pure concrete frame and two concrete frames with additional shock absorber steel frame were designed and fabricated. The cracking and failure state, hysteretic curve, skeleton curve and stiffness degradation of the frame were studied by low-cycle reciprocating loading test. Equivalent damping ratio and strain development of reinforced concrete beams and additional steel frames. The experimental results show that the failure mechanism of the structure is more reasonable, the energy dissipation performance of buckling restrained braces is stable and the hysteretic curve of the strengthened structure is full. The reinforced concrete frame strengthened by external additional steel frame can increase the shear bearing capacity of the existing concrete frame structure to more than 3 times, and the external additional steel frame and buckling restrained bracing can work together. The compression and shear brittle failure of concrete columns can be avoided under the fortification target. Finally, some suggestions are given to improve the connection structure design of the additional shock absorber frame.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中冶建筑研究总院有限公司;天津水泥工业设计研究院有限公司;
【分类号】：TU352.11;TU375.4

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