【摘要】 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。更多还原

【Abstract】 Based on the tangent modulus theory,the formula for calculating the ultimate bearing capacity of elastoplasticity stability of axially loaded steel tubular slender columns filled with steel-reinforced concrete is obtained.It shows that the calculated results are in good agreement with the test results.Then the bounds slenderness ratio of this composite column is deduced through the stability theory of the structure.Moreover,a numerical method is applied for the nonlinear full-range analysis of this composite columns by considering initial deflection of l₀/1000 length of the column.The calculated curves agree well with the experiment curves.Based on a large number of calculated data,a simplified calculating formula for the ultimate bearing capacity of axially loaded slender composite columns is proposed,and the reliability level of the columns under axial compression designed following the proposed formula is investigated.Analysis results indicate that the reliability indexes of this columns satisfy the demand of unified standard for reliability design of building structures（GB50068—2001）.更多还原