钢货架锁螺栓式梁柱节点子结构的抗连续性倒塌性能分析

doi:10.12066/j.issn.1007-2861.2589

摘要/Abstract

摘要： 为研究钢货架锁螺栓式梁柱节点的抗连续性倒塌性能,在中柱移除工况下,对钢货架锁螺栓式梁柱节点的双半跨子结构开展了试验研究,探究了空载和半载对子结构内力效应和抗力性能的影响,提供了子结构试件的全过程荷载-位移曲线和典型破坏模式,发现锁螺栓式梁柱节点的典型破坏模式为挂齿断裂+挂片端板剪出破坏(the combination of tab crack and bolt bearing failure leading to tearing of beam-end-connector,T+B).构建了全尺寸精细化有限元模型,并通过与试验结果对比验证了其可靠性.进一步探究了螺栓数量和螺栓位置对子结构抗连续性倒塌性能的影响.试验结果显示,与锁1颗上部螺栓空载的梁柱节点子结构试件相比,托盘货物荷载会削弱子结构的极限竖向抗力和变形能力;锁上下2颗螺栓会显著提高子结构的极限竖向抗力,而极限变形能力较差;锁1颗下部螺栓会轻微提高子结构的极限竖向抗力,而极限变形能力显著降低.对钢货架梁柱节点进行抗连续性倒塌设计时,推荐锁1颗上部螺栓或锁上下2颗螺栓,以提高结构抵抗连续性倒塌的鲁棒性.

关键词: 钢货架, 连续性倒塌, 数值模拟, 梁柱节点子结构, 弯曲机制, 悬链线机制

Abstract: To study the progressive collapse resistance of bolted beam-to-upright connections in steel storage racks, an experimental study was conducted on their double half-span substructures under a middle column removal scenario to explore the effects of no-load and half-load conditions on the internal force effects and resistance performance of the substructures. The full-range load-displacement curves and typical failure modes of the substructure specimens were provided, and it was found that the typical failure mode of the bolted beam-to-upright connections was the combination of tab crack and bolt bearing failure leading to tearing of beam-end-connector (T+B). A full-scale refined finite element model was constructed, and its reliability was validated by comparing with the experimental results. Furthermore, the effects of the number and positions of bolts on the progressive collapse resistance of the substructures were explored. The experimental results showed that compared with the beam-to-upright connection substructure specimen locked with one upper bolt under no-load, the pallet cargo load weakened the ultimate vertical resistance and deformation capacity of the bolted beam-to-upright connection substructures. Locking two bolts (upper and lower) significantly improved the ultimate vertical resistance of the substructures, but the ultimate deformation capacity was poor. Locking one lower bolt slightly improved the ultimate vertical resistance of the connection substructures, while the ultimate deformation capacity of the substructures significantly decreased. For the progressive collapse resistance design of beam-to-upright connections in steel storage racks, it was recommended to lock one upper bolt or two bolts (upper and lower) to improve the structural robustness against progressive collapse.

Key words: steel storage rack, progressive collapse, numerical simulation, beam-toupright connection substructure, flexural mechanism, catenary mechanism

中图分类号:

戴柳丝, 姚浩, 任重. 钢货架锁螺栓式梁柱节点子结构的抗连续性倒塌性能分析[J]. 上海大学学报(自然科学版), 2026, 32(3): 447-463.

DAI Liusi, YAO Hao, REN Chong. Analysis of progressive collapse resistance of bolted beam-to-upright connection substructures in steel storage racks[J]. Journal of Shanghai University（Natural Science Edition）, 2026, 32(3): 447-463.

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