【摘要】 该文设计制作两榀带防屈曲耗能腋撑钢筋混凝土框架模型和一榀普通钢筋混凝土框架模型,分别对其进行低周反复荷载作用下的抗震性能试验。研究两类框架结构的破坏特征、滞回特性、强度和刚度退化、耗能能力以及关键测点应变变化情况,并采用有限元软件SeismoStruct对其进行模拟对比分析。研究结果表明:设置防屈曲耗能腋撑提高框架结构的初始刚度和承载能力,延缓裂缝的开展;提高结构的整体耗能能力;改变框架结构的受力模式,使塑性铰的发展从梁端和柱端转到腋撑连接处,减小梁柱节点区的受力,有效地保护了梁柱节点;防屈曲耗能腋撑框架的破坏特征与普通框架相同,均由柱脚形成塑性铰而破坏。更多还原

【Abstract】 Two models of RC frame structures with buckling-restrained haunch braces(BRHB) and a general RC frame structure model were designed and their seismic performances were tested under low frequency cyclic loading.Seismic behaviors such as failure modes,hysteretic performance,strength and stiffness degradation,energy dissipation capacity and reinforcement strain of key measure points of these specimens were investigated.The finite-element software SeismoStruct was employed for simulation analysis of the models.The investigation results indicated that the initial stiffness and bearing capacity of the RC frame structure with BRHB were enhanced,the development of crack could be delayed,and the bearing mode of the frame structure was changed.The stress of beam-column joints was reduced,which could effectively protect the beam-column joint,the development of the plastic hinges on the end of column and beam transferred to the joint of haunch brace,also the energy dissipation capacity of the RC frame structure with BRHB was improved.Compared with general RC frame structure,the failure modes of the RC frame structure with BRHB was the same,as the plastic hinges on the root of the columns finally developed seriously up to destruction.更多还原