不同构造形式延性节点的钢框架损伤退化滞回性能有限元分析

Hysteretic behavior based on damage and degradation of steel frames with ductile nodes under cyclic loading

针对空间钢框架在低周反复荷载作用下的滞回性能、破坏机理和损伤退化性能等进行了有限元分析。研究结果表明:加腋型节点钢框架可以有效降低梁柱翼缘连接焊缝处应力,与其他构造形式节点相比,其耗能能力较强;翼缘板加强型节点可使梁柱翼缘焊缝处应力降低约20%。不同构造形式节点钢框架在低周反复荷载作用下承载力化正负向退化不一致;刚度退化曲线差别很小,钢框架节点形式的构造差异对其刚度退化曲线影响不显著。

Hysteretic behavior,failure mechanism,and degradation performance of space steel frames were analyzed under the cy-clic loading.The results showed that compared to the spatial steel frame with ordinary node,the spatial steel frame with axillarily enhanced node have reduced stress at beam flange weld and have best energy dissipation capacity;the spatial steel frame with flange plate enhanced node can approximately reduce the stress at beam flange weld by 20%.Loading capacity degradation varies in different steel frame models,and stiffness degradation behaves more consistently.Stiffness degradation curve of different forms of nodes in steel frame was not significant.