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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。
In order to study the seismic performance of T-shaped steel tube recycled concrete column-steel beam frame joints, taking the replacement rate of recycled aggregates as 100%, 3-node specimen models were prepared and quasi-static tests were carried out according to the existing codes. The influence of axial compression ratio on the seismic performance of joints was studied. The failure process of the joints during loading was observed. The seismic performance indexes such as hysteresis curve, skeleton curve, ductility, stiffness degradation, energy dissipation capacity and shear deformation in the core zone were analyzed. The results show that the failure modes of the joints are similar and the local buckling failure of the plastic hinges appears, which meets the seismic design requirements of “strong column and weak beam, strong node and weak rod”; the limit of axial compression ratio to the node Bearing capacity and ductility have a certain impact, the greater the axial compression ratio, the higher the ultimate bearing capacity of nodes, but the ductility and energy dissipation capacity will be reduced, and the more serious degradation of stiffness; node hysteresis curve full, with good seismic performance, The use of such nodes can be promoted in earthquake-protected areas and beyond.