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为避免转换结构在转换层处发生严重震损,提出采用耗能腋撑对转换结构进行加固.对普通转换框架和耗能腋撑加固转换框架进行低周反复试验.试验结果表明:通过合理的设计,采用耗能腋撑对转换结构进行加固可控制转换梁裂缝的进一步发展;加固后转换结构的初始刚度提高,承载力较普通试件提高10.9%,延性系数提高77.1%,滞回耗能和等效粘滞系数分别提高93.1%和1.07倍;采用耗能腋撑对震损转换层结构进行加固不仅达到了抗震加固的目的,而且可以改善转换层结构的抗震性能.文中还建立了耗能腋撑加固转换结构的精细化有限元模型,并与试验结果进行了对比.结果表明,文中建立的模型具有较高的精度,可以用于该类加固结构的后续有限元分析.
In order to avoid the severe damage of the conversion structure at the conversion layer, the energy conversion axillary brace is proposed to reinforce the conversion structure. The low-cycle repeated test is carried out on the ordinary conversion frame and the energy-saving axillary reinforcement conversion frame. The test results show that: The initial stiffness of the conversion structure increases after reinforcement, the bearing capacity is increased by 10.9% compared with the normal specimen, the ductility coefficient is increased by 77.1%, and the hysteresis energy dissipation And the equivalent viscous coefficient increased by 93.1% and 1.07 times, respectively. Reinforcing the structure of earthquake-shock transfer layer by energy-dissipating axillary reinforcement not only achieved the purpose of aseismic reinforcement, but also improved the seismic performance of the transfer layer structure. The finite element model can be axled and reinforced, and compared with the experimental results.The results show that the model established in this paper has high precision and can be used for the subsequent finite element analysis of such reinforced structures.