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为了研究在中柱失效情况下钢-混凝土组合梁的连续倒塌性能,利用ANSYS软件对12根组合梁柱子结构试件进行了有限元建模,分析了混凝土板中配筋率、组合梁跨高比、栓钉间距、梁端纵向约束条件等参数对组合梁连续倒塌性能的影响。结果表明,板中配筋率、跨高比、钢梁高度等参数对组合梁的抗倒塌承载力影响显著;考虑悬链线工作机制的组合梁极限抗倒塌承载力约为按照塑性铰破坏模型计算所得抗倒塌承载力的1.34~1.86倍;进行组合梁的静力倒塌分析时应考虑荷载的冲击作用,倒塌荷载动力增大系数(DIF)可在1.13~1.41之间取值。
In order to study the continuous collapse behavior of steel-concrete composite beams with failure of the center column, 12 finite element models of the composite beams and columns were made with ANSYS software. The reinforcement ratio, Ratio, the distance between studs and the longitudinal restraint of beam ends on the continuous collapse behavior of composite beams. The results show that the parameters such as reinforcement ratio, span ratio and height of steel beam affect the anti-collapse bearing capacity of composite beams significantly. The ultimate bearing capacity of composite beams considering the working mechanism of catenary is approximately in accordance with plastic hinge failure model The calculated bearing capacity of anti-collapse is 1.34-1.86 times. The impact of load should be considered in the analysis of static collapse of composite beam. The coefficient of dynamic increase of collapse load (DIF) can be between 1.13 and 1.41.