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钢管混凝土核心短柱承载力目前仍无统一计算方法,针对此问题,文章基于钢管混凝土核心柱轴压承载力计算方法与外围普通钢筋混凝土体积配箍率有着密切关系的认识,分体积配箍率小于和等于大于临界配筋率两种情况建立了该柱轴压承载力计算公式;当外围混凝土的配箍率小于临界配箍率时,组合柱的破坏是由外围混凝土控制,根据协同工作原理,通过对钢管混凝土核心柱各组成部分荷载-变形曲线分析,建立了该柱轴压承载力计算公式;当外围混凝土的配箍率等于或大于临界配箍率时,核心柱破坏时钢管内外混凝土都能达到极限状态,采用极限平衡法推导该柱轴压承载力计算公式。理论分析与实验结果相吻合,表明了本文方法的正确性。
In order to solve this problem, based on the calculation method of axial compressive bearing capacity of CFST core column, it is closely related to the volumetric stirrup ratio of ordinary reinforced concrete in perimeter, The formula of axial compressive bearing capacity of the column is established for both cases when the ratio is less than or equal to greater than the critical reinforcement ratio. When the stirrup ratio of the surrounding concrete is less than the critical stirrup ratio, the failure of the composite column is controlled by the perimeter concrete. , The formula of bearing capacity of the column under axial load is established by analyzing the load-deformation curve of each component of CFST core column. When the stirrup ratio of the surrounding concrete is equal to or greater than the critical stirrup ratio, Can reach the limit state, using the limit equilibrium method to derive the column axial compression bearing capacity formula. The theoretical analysis is in good agreement with the experimental results, which shows the correctness of the method in this paper.