为研究T形钢管再生混凝土柱-钢梁框架节点的抗震性能,取再生骨料取代率为100%,根据现行规范制作了3个节点试件模型并进行了拟静力试验.研究轴压比对节点抗震性能的影响,观察节点在加载全程中的破坏过程,分析滞回曲线、骨架曲线、延性、刚度退化、耗能能力及核心区剪切变形等抗震性能指标.结果表明:节点的破坏形态大体相似,表现为钢梁出现塑性铰的局部屈曲破坏,满足了"强柱弱梁、强节点弱杆件"的抗震设计要求;轴压比对节点的极限承载力和延性有一定影响,轴压比越大,节点的极限承载力越高,但延性和耗能能力会降低,且刚度退化越严重;节点的滞回曲线饱满、具有良好的抗震性能,可在抗震设防区及其他地区推广该类节点的使用.%To study the failure modes and seismic behavior of frame joints between steel tube (RACFST) T-shaped column filled with recycled aggregate concrete and a steel beam, three joints specimen with replacement ratio of 100% was designed and manufactured based on the current design codes.Three joints were tested under reversed cyclic loading.The seismic behavior of joints on different axial compression ratio was taken into account.The failure process during loading procedure were recorded, and the seismic behavior indexes including hysteretic curve, skeleton curve, ductility, stiffness degeneration, dissipation capacity and shear deformation of core zone were analyzed.The results indicated that the failure mode of all RACFST T-shaped columns and steel beams are bending failure of beam, which meets the "strong column and weak beam, strong node and weak lever" requirements of seismic design.The axial compression ratio has some influences on the ultimate bearing capacity and ductility of joints.With the increase of axial compression ratio, the shear bearing capacity will increase, however, the ductility and the energy dissipation capacity decrease, and stiffness degradation will be more serious.All the hysteretic curves of joints are plump and these types of joints have a good seismic behavior, which can be used widely in earthquake protection region and other regions.
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