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为研究加载制度对狗骨式连接钢框架结构变形能力及累积耗能能力的影响,设计了5榀单跨狗骨式连接钢框架子结构,对其进行单向加载、等位移循环加载、标准加载及近场地震动作用下的拟静力试验。结果表明:所有框架出现的塑性铰均在钢梁端部的翼缘削弱位置,避免了钢梁端部焊缝的过早脆性断裂;狗骨式连接钢框架结构滞回曲线饱满、变形能力及延性性能优良。此外,加载制度对狗骨式连接钢框架子结构的层抗侧刚度、水平承载力退化、极限变形能力及累积耗能能力均有显著影响。等位移循环时,加载位移幅值越小,狗骨式连接钢框架子结构的层抗侧刚度及承载力退化越趋于缓慢,其层间累积延性系数及等效能量耗散系数越大。
In order to study the effect of loading system on the deformability and cumulative energy dissipation capacity of dog bone-connected steel frame structure, a 5 榀 single-span dogbone steel frame sub-structure was designed and uniaxially loaded, Quasi-static test under loading and near-field vibration. The results show that the plastic hinges appearing in all the frames are in the weakening position of the flange of the end of the steel beam, avoiding the premature brittle fracture of the weld at the end of the steel beam. The hysteresis curve of the dog-bone steel frame structure is full, Ductile performance is excellent. In addition, the loading system has a significant impact on the lateral stiffness, the horizontal bearing capacity degradation, the ultimate deformation capacity and the cumulative energy dissipation capacity of the dog-bone-connected steel frame substructure. When the displacement amplitude is smaller, the degradation of the lateral stiffness and the bearing capacity of the dog-bone-connected steel frame sub-structure tend to be slower, and the cumulative ductility coefficient and the equivalent energy dissipation coefficient between the layers become larger.