基于统一理论的带拉杆方、矩形CFT轴压承载力

Axial strength of square and rectangular CFT with binding bars based on unification theory

在钢管混凝土统一理论基础上,结合配置约束拉杆的方形和矩形钢管混凝土短柱轴压试验结果,通过研究带拉杆方形钢管混凝土的拉杆约束系数与轴压承载力之间的关系,修正统一理论轴压承载力公式,得出带拉杆方形钢管混凝土轴压承载力计算公式。对于带单向拉杆矩形钢管混凝土,提出将矩形截面以拉杆为界线划分为几个子区域,并将拉杆视为等效钢板,采用统一理论计算公式计算每个子区域的轴压承载力,叠加后得出带拉杆矩形钢管混凝土轴压承载力计算公式。以上两个修正公式均考虑了拉杆的影响,拓宽了统一理论计算公式的适用性,分别用其计算的带拉杆的方形和矩形钢管混凝土轴压承载力与试验结果吻合良好。

Based on the unification theory and combined with experimental results of square and rectangular concrete filled steel tubular （CFT） stub columns with binding bars under axial load, the axial strength formula of unification theory is modified according to the relation between the constraining factor of binding bars and the axial strengths of square CFT, then a revised axial strength formula of square CFT with binding bars is proposed. For rectangular CFT with unidirectional binding bars, a method which divides the rectangular section into several sub-regions with binding bars as their borders is put forward and binding bars as equivalent steel plates is taken. The axial strength of each sub-region is calculated by the formula of unification theory, and then a revised axial strength formula of R-CFT with binding bars is generated after the summation of the axial strengths of all sub-regions. These two revised formulas both consider the influence of binding bars and broaden the applicability of the formula of unification theory. The axial strengths of square and rectangular CFT with binding bars predicted by the two revised formulas proposed herein agree well with the experimental results.