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为研究翼缘削弱型节点空间钢框架在低周反复荷载作用下的抗震性能,采用有限元分析软件ABAQUS对普通节点和翼缘削弱型节点的空间钢框架模型进行有限元模拟,对2种钢框架模型的破坏形式、承载力、滞回性能、耗能能力、强度及刚度退化性能等进行了对比分析。结果表明:翼缘削弱型节点可使梁端塑性铰外移至梁端翼缘削弱处,避免梁端焊缝处应力集中导致脆性破坏;翼缘削弱型节点等效粘滞阻尼系数与普通节点空间钢框架相比有明显的提高,进入屈服阶段后由于应力重分布,其刚度及承载力退化速度较普通节点空间钢框架慢,翼缘削弱型节点钢框架具有梁铰延性破坏机制,抗震性能较好。
In order to study the seismic behavior of flange-weakening joint space steel frame subjected to low-cycle reversed loading, the finite element analysis software ABAQUS was used to simulate the space steel frame model of common node and flange-weakening node, The failure modes, bearing capacity, hysteretic behavior, energy dissipation capacity, strength and stiffness degradation of the frame model were compared and analyzed. The results show that the flange weakening node can make the plastic hinge of the beam move outward to the weakening of the flange of the beam end to avoid the brittle failure caused by the stress concentration in the weld of the beam end. The equivalent viscous damping coefficient of the flange weakening node is similar to that of the ordinary node space steel Compared with the conventional steel frame, the steel frame with flange weakening node has a ductile failure mechanism and the seismic performance is better .