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对1个内隔板式箱型柱-H型钢梁常规节点和3个梁翼缘扩大头-圆孔削弱型节点进行了循环加载试验,并进行了基于结构钢椭球面断裂模型及耦联的椭球面屈服模型的数值模拟和断裂分析.结果显示,常规节点裂纹起始于梁翼缘对接焊缝侧边,未能形成有效转动能力的塑性铰,节点的塑性转角约为0.02rad.梁翼缘扩大头-圆孔削弱型节点在圆孔削弱梁截面形成塑性铰,大孔侧边开裂风险较其他区域大,扩大头构造显著降低了对接焊缝的断裂风险.当内隔板与柱壁板间焊缝质量较好时,圆弧扩大头-圆孔削弱型节点的塑性转角可达到FEMA要求的0.03rad,承载力较常规节点提高39.8%~52.9%.
Cyclic loading tests were carried out on 1 internal partitioned box column-H type steel beam regular node and 3 beam flange expansion-round hole weakening type nodes. The elliptical spherical fracture model and the coupled ellipses The numerical simulation and fracture analysis of the spherical yielding model show that the crack initiation of conventional joints starts at the side edge of butt welds of the beam flange and fails to form a plastic hinge with an effective rotational ability. The plastic corner of the joint is about 0.02 rad. The hole weakened joints form a plastic hinge in the section of the circular hole weakening beam, and the risk of cracking on the side of the large hole is larger than that in other areas, and the enlarged head structure significantly reduces the risk of fracture of the butt weld.When the quality of the weld between the internal partition and the column wall At a better time, the plastic corner of the circularly enlarged head-circular hole weakened node can reach 0.03rad as required by FEMA, and the bearing capacity of the circularly enlarged head-circular hole can be increased by 39.8% -52.9% compared with the conventional node.