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建筑结构发生柱移除情况时,悬链作用对防止连续倒塌的发生有重要作用。通过足尺试验和数值模拟,研究平面框架内焊接无加劲翼缘和螺栓腹板连接的悬链性能。试验研究两种不同的钢梁上螺栓的排列,两个试件分别为一行4个螺栓和一行2个螺栓。结果证明,两种焊接无加劲翼缘和螺栓连接节点的试件都能够通过螺栓腹板的初始弯曲阶段产生有效的悬链作用。螺栓腹板的失效模式随悬链作用下不同的螺栓排列方式而变化。当所有螺栓在一行时,腹板最下面的螺栓承载面积会在焊接孔附近的失效发生前就被压缩至断裂。然而,当螺栓分两行分布时,螺栓孔横截面发生了剪切破坏。在柱移除情况下,前者的失效模式被认为比后者更为不利。
When the removal of the column structure occurs, the role of catenary chain to prevent the occurrence of continuous collapse has an important role. Through the full-scale test and numerical simulation, the catenary performance of welded stiffened flange and bolt web in plane frame was studied. Experimental study of two different steel beams on the bolt arrangement, two specimens were a row of 4 bolts and a row of 2 bolts. The results show that both specimens without stiffened flanges and bolted joints can produce effective catenary effect through the initial bending of the bolt web. The failure mode of the bolt web varies with the arrangement of the different bolts under the action of the catenary. When all the bolts are in one row, the lowest bolt-bearing area of the web is compressed to rupture before the failure near the weld hole occurs. However, when the bolts are distributed in two rows, shear failure occurs in the cross section of the bolt hole. In the case of column removal, the former failure mode is considered more negative than the latter.