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基于切线模量理论推导了钢骨-钢管混凝土轴压中长柱弹塑性稳定承载力的计算公式,理论计算值与试验结果吻合良好,在此基础上推导了该组合柱的界限长细比。其次,以l0/1000作为初始挠度,利用数值计算方法对钢骨-钢管混凝土轴压中长柱进行了非线性全过程分析,数值分析得到的荷载-变形曲线与试验曲线吻合较好。在大量数值分析的基础上,提出了便于工程应用的钢骨-钢管混凝土轴压中长柱极限承载力简化计算公式,并对其可靠度水准进行了校验,分析结果表明,计算公式满足GB 50068—2001对构件可靠指标的要求。
Based on the tangent modulus theory, the formula for calculating the elasto-plastic stable bearing capacity of steel-carbon concrete long-axis columns is deduced. The calculated results are in good agreement with the experimental results. On the basis of this, the slenderness ratio is deduced. Secondly, the full-scale nonlinear analysis of steel-reinforced concrete (CFST) long-column with l0 / 1000 as initial deflection is carried out by numerical calculation. The load-deformation curve obtained by numerical analysis is in good agreement with the experimental curve. Based on a large number of numerical analyzes, a simplified formula for calculating the ultimate bearing capacity of steel-carbon concrete long-axis columns with long columns is proposed, and the reliability of the model is verified. The analysis results show that the calculated formula satisfies GB Requirements for reliable components of components.