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选取钢框架中柱节点,设计并制作了3个十字形非对称腋板加强型节点进行滞回性能试验研究和ANSYS有限元分析。研究结果表明:3个非对称腋板加强节点试验试件均出现明显的塑性铰,滞回曲线饱满,骨架曲线具有明显的弹性、弹塑性、塑性发展过程;有限元结果表明:低周往复荷载作用下节点等效黏滞阻尼系数随腋板高度增大而减小、随腋板长度增加而增大,且随梁水平夹角增大,等效黏滞阻尼系数变化规律为先增加后减小,腋板水平夹角为30°左右时等效黏滞阻尼系数最大,耗能能力最强,有限元计算与试验结果取得了较好一致性;非对称腋板与对称腋板加强型节点相比,两类节点的延性系数、耗能能力等抗震性能相差不大,对称腋板加强型节点塑性铰处的外移机制更有效,塑性变形更为充分。
The column nodes in the steel frame are selected and three cross-shaped asymmetric armature reinforcement nodes are designed and fabricated for the hysteretic performance test and ANSYS finite element analysis. The results show that the plastic hinge is obviously appeared in the test specimens of three asymmetric armpit reinforcement joints, the hysteresis curve is full, and the skeleton curve has obvious elastic, elastic-plastic and plastic development process. The finite element results show that the low-cycle reciprocating load The equivalent viscous damping coefficient decreases with the increase of the height of the armpit and increases with the increase of the length of the armpit. With the increase of the included angle of the beam, the change of the equivalent viscous damping coefficient first increases and then decreases The results show that the equivalent viscous damping coefficient is the largest and the energy dissipation capacity is the strongest when the angle between the small and the armpit is about 30 °. The calculated result of the finite element method is in good agreement with the experimental results. The asymmetric armpit and the symmetrical armpit strengthened node Compared with the two kinds of joints, the ductility coefficient and energy dissipation capacity of the two kinds of joints have little difference in seismic performance. The outward displacement mechanism of the plastic hinges in the symmetrical armpit strengthened joints is more effective and the plastic deformation is more sufficient.