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基于钢框架翼缘削弱型节点低周往复荷载试验的5个试件和1个普通节点的试件,在合理选择有限单元类型基础上,采用通用有限元软件ANSYS对节点进行了循环荷载作用下的受力性能有限元分析,研究了翼缘削弱型节点的破坏形态、极限荷载、最大塑性转角、延性性能、耗能性能。有限元计算得到的荷载-位移滞回曲线及局部破坏形态与试验结果符合较好。研究结果表明:对梁翼缘进行适当削弱后形成的骨型节点在梁翼缘削弱区域可以形成一个扩大的塑性铰区,耗散大部分能量,避免梁根部应力发展导致梁柱连接焊缝过早出现脆性破坏,并且比传统节点具有更强的耗能能力,是一种较为理想的延性节点。研究结果还表明,梁柱间对接焊缝具有良好质量才能充分发挥翼缘削弱型节点的耗能性能。
Based on the five specimens and one ordinary joint specimen of low-cycle cyclic loading test of steel frame flange weakening node, based on the reasonable selection of finite element types, the common finite element software ANSYS was used to carry out cyclic loading on the nodes Finite element analysis of the mechanical properties of the flange weakening node failure mode, the ultimate load, the maximum plasticity angle, ductility, energy performance. The load-displacement hysteresis curve obtained by the finite element method and the local failure morphology are in good agreement with the experimental results. The results show that the bone nodes formed after properly weakened beam flanges can form an enlarged plastic hinge zone in the flange weakening area, dissipate most of the energy, and avoid the stress development at the root of the beam, resulting in premature brittle fracture , And has stronger energy dissipation capacity than traditional nodes, which is an ideal ductile node. The results also show that the butt weld between beam and column has good quality to fully utilize the energy dissipation performance of flange weakening node.