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通过一榀四跨单层钢-混凝土组合框架试验研究,分析中柱失效后结构体系的抗倒塌性能。试验结果表明:中柱失效后,组合框架的连续倒塌过程分为6个阶段,即弹性阶段、弹塑性阶段、压拱阶段、塑性阶段、过渡阶段及悬链线阶段,结构主要通过塑性铰机制和悬链线机制进行内力重分配;组合梁可以保证悬链线作用的形成,其特有的压拱效应可在一定程度上提高结构关键柱失效初期的承载能力;根据现行规范设计的组合框架在关键柱失效后仍具有较高的承载力,具有一定的抗倒塌能力。同时采用ABAQUS建立了试验试件的有限元分析模型,有限元分析结果和试验结果进行对比,验证了有限元分析结果的正确性。针对组合框架中的压拱效应进行分析,并结合试验现象提出一种新的“桁架弹簧”压拱模型,推导了竖向位移-荷载相关计算式及竖向位移-水平位移相关计算式,计算式计算结果与试验结果吻合良好。
The anti-collapse performance of the structural system after the failure of the center column is analyzed through a one-four span single-story steel-concrete composite frame test and study. The experimental results show that the continuous collapse process of the composite frame is divided into six stages after the failure of the center column, namely, the elastic stage, the elastic-plastic stage, the arch stage, the plastic stage, the transition stage and the catenary stage. The structure is mainly controlled by the plastic hinge mechanism And catenary mechanism for the internal force redistribution; composite beam can ensure the formation of catenary effect, its unique arch effect to a certain extent, improve the structural capacity of the early failure of the key column; composite frame designed according to the current norms in the After the failure of the key column still has a high bearing capacity, with some anti-collapse ability. At the same time, the finite element analysis model of the test specimen was established by using ABAQUS. The results of finite element analysis and experimental results were compared to verify the correctness of the finite element analysis results. Based on the analysis of the arch effect in the composite frame and a new “truss spring” arch model based on the experimental phenomena, the calculation formula of vertical displacement-load correlation and the correlation formula of vertical displacement-horizontal displacement are derived The calculated results are in good agreement with the experimental results.