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钢管混凝土复合柱(简称“复合柱”)是以钢管混凝土为柱肢、以钢筋混凝土板为缀板的新型组合柱。复合轴压短柱以缀板压碎为破坏特征,钢管混凝土柱肢没有达到其自身的承载力。因此,在复合短柱的轴压承载力叠加计算时,钢管混凝土柱肢的承载力应进行折减。本文采用有限元分析方法,通过变形协调条件,得到缀板压碎时,钢管混凝土柱肢分担的荷载,将其与其承载力的比值定义为柱肢承载力折减系数。讨论了选取不同理论计算钢管混凝土柱肢承载力时应采用的折减系数值及其受套箍系数影响的规律。分析结果表明,当采用统一理论计算钢管混凝土柱肢承载力时,对应的柱肢承载力折减系数趋于一个定值;而采用极限平衡理论计算时,折减系数随着套箍系数的增大而减小,折减系数与套箍系数之间的关系可通过简单的线性拟合得到。
Concrete-filled steel tube column (referred to as “composite column ”) is a new type of composite column with CFST as column limbs and reinforced concrete slabs. The composite axial compression short columns were broken into slats by slats, and the concrete-filled steel tubular columns did not reach their own bearing capacity. Therefore, when the axial compressive bearing capacity of composite short columns is superposed, the bearing capacity of CFST columns should be reduced. In this paper, finite element analysis method is used to obtain the load shared by CFST columns and columns when the slab is crushed by the deformation coordination condition, and the ratio of the load to the load-bearing capacity of the CFST columns is defined as the reduction coefficient of the bearing capacity of the columns. Discusses the value of the reduction factor and its influence on the coefficient of the ferrule when choosing the different theoretical calculation of the bearing capacity of the concrete filled steel tubular column. The analysis results show that when using the unified theory to calculate the bearing capacity of column-to-column concrete-filled steel tubular columns, the corresponding reduction coefficient of column-bearing capacity tended to be a fixed value. When using the limit equilibrium theory, the reduction coefficient increases with the increase of the hoop coefficient Large and decrease, the relationship between the reduction factor and the cuff coefficient can be obtained by a simple linear fit.