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提出了一种新型的节点域箱形加强式工字形柱弱轴连接,基于此节点形式设计梁翼缘削弱型边框架节点足尺试件进行单调荷载试验研究。采用通用有限元软件ABAQUS对此类节点在单调荷载作用下的受力性能进行模拟对比验证后,对此类节点进行低周反复荷载作用下一系列有限元变参数模拟分析,研究各削弱参数对该类节点滞回性能的影响。研究结果表明:梁翼缘削弱型新型弱轴连接节点在低周反复荷载作用下,塑性转动能力达到0.03 rad,塑性铰出现在削弱处,柱子节点域基本处于弹性状态,能较好地满足“强柱弱梁”和“强节点域”的抗震设计理念;不同削弱参数对节点的承载力、刚度、转动能力和延性有一定影响。对新型弱轴连接的削弱参数建议取值:削弱部位距蒙皮板的距离a取值为0.5~0.75倍的梁翼缘宽度,削弱区段长度b取值为0.65~0.85倍的梁截面高度,削弱深度c取值为0.2~0.25倍的梁翼缘宽度。
A new type of box-shaped I-shaped box-shaped weak axis connection was proposed. Based on this node, a monotonic load test was carried out on the full-scale specimens with full-length beam flanges. The common finite element software ABAQUS is used to simulate and verify the mechanical behaviors of such nodes under monotonic loading. After a series of finite element analysis and simulation of low-cycle cyclic loading of such nodes, the influence of weakening parameters Hysteresis performance of such nodes. The results show that the plasticity rotation capacity of the new type of weak-axis joint with weakening flange is 0.03 rad under the low-cycle repeated loading, and the plastic hinge appears at the weakening point. The node area of the column is basically in elastic state and can satisfy the requirement of strong The seismic design concept of “weak weak beam” and “strong node domain”. The different weakening parameters have certain influence on the bearing capacity, stiffness, rotation ability and ductility of the joints. Weakening parameters of the new type of weak axis connection Recommended values: weakening the distance from the skin a a value of 0.5 to 0.75 times the beam flange width, weakening section length b value of 0.65 to 0.85 times the beam section height, weaken The depth c is 0.2 ~ 0.25 times the beam flange width.