H形梁翼缘双肋板加强式弱轴连接的抗震性能分析

提出了一种适用于工字形柱箱形节点域的H形梁翼缘双肋板加强式弱轴连接；应用ABAQUS有限元软件对标准节点、梁翼缘外侧双肋板加强式节点和梁翼缘内侧双肋板加强式节点共7个足尺计算模型进行了力学性能分析，研究了节点破坏模式、滞回特性、骨架曲线、耗能能力、塑性转动能力和延性等问题。结果表明:箱形节点域双肋板加强式弱轴连接能够有效地在梁端形成塑性铰，并且塑性铰远离节点核心区，从而实现强柱弱梁和强节点弱构件的抗震理念；梁翼缘内侧双肋板加强式节点可以达到与梁翼缘外侧双肋板加强式节点相同的抗震性能，并且改善了梁柱翼缘对接焊缝的应力；梁翼缘双肋板加强式节点的耗能能力和延性系数都有显著提高，塑性转动能力达到FEMA 267建议的0.03 rad，符合国际上对节点塑性转动能力的要求。

Analysis on Seismic Behavior of H-type Beam Flange Double Rib Reinforced Weak Axis Connection

A kind of H-type beam flange double rib reinforced weak axis connection suitable for box node domain of I-section column was presented. The mechanical behaviors of seven full-scale calculation models, including standard joints, double rib reinforced connections internal and external of beam flange, were analyzed using ABAQUS finite element software. The failure patterns, hysteretic characteristics, skeleton curves, energy dissipation capacity, plastic rotation ability and ductility of connections were studied. The results show that the plastic hinge at beam end can be effectively formed by double rib reinforced weak axis connection of box node domain, and the plastic hinge is away from the core area. The seismic principle of strong column weak beam and strong node weak component is achieved. The same seismic behavior of double rib reinforced connections internal and external of beam flange can be obtained, and the stress of beam and column flange butt welding is improved. The dissipation capacity and ductility coefficient of beam flange double rib reinforced connection are improved significantly, and the plastic rotation ability can reach 0.03 rad proposed by FEMA-267 and meet the international requirements.