Progressive Collapse Analysis of Concrete-filled Steel Tubular Column to Steel Beam Connections Using Multi-scale Model
Progressive Collapse Analysis of Concrete-filled Steel Tubular Column to Steel Beam Connections Using Multi-scale Model
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DOI：
10.1016/j.istruc.2016.10.004
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发表时间：
2017-02
期刊：
影响因子：
4.1
通讯作者：
Wen-Da Wang;Huawei Li;Jing-Xuan Wang
中科院分区：
文献类型：
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作者：
Wen-Da Wang;Huawei Li;Jing-Xuan Wang
采用纤维梁单元与细观单元相结合的多尺度模型，研究了钢梁-钢管混凝土柱节点的连续倒塌性能。采用非线性静力分析方法，考虑相邻节理骨架的影响，对连续倒塌的抗力、破坏模式和应力分布进行了分析，揭示了连续倒塌过程中节理的抗力机理。采用非线性动力分析方法，得到了反映节点抗连续倒塌要求的竖向位移时程曲线。通过对节点静力非线性分析结果和动力非线性分析结果的分析，得到了节点的承载力与抗力需求之间的关系。分析结果表明，设置这些节点的框架结构能够形成抵抗不平衡荷载的机制和新的交替路径，防止节点连接柱失效后连续倒塌的发生。相邻框架结构可以提高节理的抗连续坍塌能力。
The multi-scale model which combined the fiber beam element with the fine element was used to investigate the progressive collapse performance of steel beam to concrete-filled steel tubular (CFST) column connections. By using the nonlinear static analysis method and taking into account the influence of the adjacent framework of joints, the resistance of progressive collapse, the failure modes and the stress distribution revealed the resistance mechanism of these joints during the process of progressive collapse. And the vertical displacement time history curves of joints which displayed the progressive collapse resistance demands of these joints were obtained by using the nonlinear dynamic analysis method. The relationship between resistance capacity and resistance demand of these joints were obtained by analyzing the nonlinear static analysis results and the nonlinear dynamic analysis results. These analysis results showed that the frame structure with these joints which enabled to form the resistance mechanism and new alternate path of unbalanced loads can prevent the occurrence of progressive collapse after the failure of column connected to joints. And the adjacent framework can improve the ability of anti-progressive collapse of these joints.