王伟, 严鹏, 李玲. 用于钢框架连续性倒塌分析的梁柱栓焊节点模型研究[J]. 工程力学, 2014, 31(12): 119-125. DOI: 10.6052/j.issn.1000-4750.2013.07.0615
引用本文: 王伟, 严鹏, 李玲. 用于钢框架连续性倒塌分析的梁柱栓焊节点模型研究[J]. 工程力学, 2014, 31(12): 119-125. DOI: 10.6052/j.issn.1000-4750.2013.07.0615
WANG Wei, YAN Peng, LI Ling. RESEARCH ON JOINT MODELS OF WELDED FLANGE-BOLTED WEB CONNECTION FOR PROGRESSIVE COLLAPSE ANALYSIS OF STEEL FRAMES[J]. Engineering Mechanics, 2014, 31(12): 119-125. DOI: 10.6052/j.issn.1000-4750.2013.07.0615
Citation: WANG Wei, YAN Peng, LI Ling. RESEARCH ON JOINT MODELS OF WELDED FLANGE-BOLTED WEB CONNECTION FOR PROGRESSIVE COLLAPSE ANALYSIS OF STEEL FRAMES[J]. Engineering Mechanics, 2014, 31(12): 119-125. DOI: 10.6052/j.issn.1000-4750.2013.07.0615

用于钢框架连续性倒塌分析的梁柱栓焊节点模型研究

RESEARCH ON JOINT MODELS OF WELDED FLANGE-BOLTED WEB CONNECTION FOR PROGRESSIVE COLLAPSE ANALYSIS OF STEEL FRAMES

  • 摘要: 该文以冷成型方钢管柱-H形梁栓焊节点子结构连续性倒塌性能试验为基础,采用有限元软件ABAQUS对试验结果进行了精细化有限元模拟,较为准确的再现了中柱失效条件下包含梁下翼缘断裂在内的节点全过程受力性能;在此基础上基于组件法和反推法构建了可反映节点内力性态演化过程、断裂及裂后路径发展等非连续变形效应的节点简化模型,同时有效降低了计算成本;将该节点简化模型应用于某5层4跨钢框架结构的非线性动力连续性倒塌分析,计算结果表明竖向位移响应对于是否考虑节点断裂可能具有相当的敏感性,应在抗倒塌性能评估中予以足够的重视。

     

    Abstract: Based on progressive collapse-behavior test results on a cold-formed RHS column to an H-beam sub-assemblage with a welded flange-bolted web connection, the whole process performance of the joint was reasonably reproduced through high fidelity finite element modeling by using ABAQUS software, including the beam bottom flange fracture under a middle column removal scenario. A simplified joint model was further proposed based on the component method and back-stepping method, which can reflect a force evolving process and discontinuous deformation such as fracture and a post-fracture path with a cost-effective solution. Incorporating this joint model, the dynamic nonlinear progressive collapse analysis was carried out on a five storey by four bay steel frame. It is found that the joint fracture imposes a significant impact on the structural vertical response and sufficient attention should be therefore paid on the behavior evaluation for progressive collapse.

     

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