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以某30层装配式斜撑节点钢框架实际工程为例,通过敏感性指标选取关键构件,并采用合理的子结构模型进行连续性倒塌过程数值模拟分析,研究了关键构件失效过程中节点位移及相关构件内力变化情况,并从内力重分布机制以及二道防线的失效模式等方面研究其破坏机理。结果表明:中柱失效后结构二道防线的塑性发展区最先出现在失效层上层与斜撑相连的上弦杆处,该处的塑性继续发展会形成“转动铰-下方”的局部重分布机制;斜撑对斜撑域内构件具有良好的保护作用,并能有效地调整中柱失效后结构的内力分布模式。
Taking the actual engineering of a 30-layer fabricated skewed-node steel frame as an example, the key components are selected by sensitivity index and the numerical simulation of continuous collapse process is carried out by using reasonable sub-structure model. The displacement of key components during failure and Related components of internal force changes, and from the internal force redistribution mechanism and the failure mode of the second line of defense and other aspects of its failure mechanism. The results show that the plastic development zone of the second line of defense of the structure after the failure of the center column first appears at the upper chord where the upper layer of the failure layer is connected with the bracing, where the plasticity continues to develop and forms the partial weight of “turning hinge - below” Distribution mechanism; bracing has a good protective effect on the components in the bracing area, and can effectively adjust the internal force distribution mode of the structure after the failure of the center column.