【摘要】 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.更多还原

【Abstract】 In order to avoid serious damage at the transfer storey of a transfer structure in earthquake,energy dissipation haunch braces(EDHBs) were used to strengthen the transfer structure,and the SRC(Steel-Reinforced Concrete) transfer frame structures with and without EDHBs were tested under cyclic loading.The results show that(1) reasonably-designed frame structure with EDHBs is effective in controlling the crack development of the transfer beam;(2) with the setting of EDHBs,the initial stiffness of the transfer structure improves,and the bearing capacity,the ductility coefficient,the hysteretic energy dissipation and the equivalent viscosity coefficient respectively increase by 10.9%,77.1%,93.1% and 107%;and(3) EDHBs not only strengthen the damaged transfer storey but also improve the seismic behaviors of the transfer structure.In addition,by comparing the test results with those obtained from the proposed fine finite element model of the SRC transfer structure with EDHBs,it is found that the proposed model is accurate enough for the subsequent finite element analysis of the structure with EDHBs.更多还原