Concrete filled steel tubular (CFST) structures have become a viable alternative to reinforced concrete or steel structures due to several advantages. One of the most important is the confinement effect of the concrete core provided by the steel tube. However, this beneficial composite action will be probably weakened by debonding, so reliable formulations to predict the reduced ultimate resistance are needed. In this paper, a review of existing specifications and experimental tests carried out on compressed circular CFST columns with and without debonding, is given. Accordingly, more circular CFST long specimens with debonding should be necessary to understand the combined influence of slenderness ratio, load eccentricity ratio and confinement factor on the reduction coefficient (${\mathit{K}}_{\mathrm{D}}$) of ultimate load capacities (${\mathit{N}}_{\mathrm{u}}$). The combined influence of arc-length ratio and thickness of circumferential debonding gap on ${\mathit{K}}_{\mathrm{D}}$ should be further studied by experimental tests. Moreover, the existing formulae for ${\mathit{K}}_{\mathrm{D}}$ and ${\mathit{N}}_{\mathrm{u}}$ show a low accuracy in predicting the test results and should be improved. To this aim, an evolutionary polynomial regression (EPR) MOGA-based methodology was performed to obtain more accurate formulations for ${\mathit{N}}_{\mathrm{u}}$ and ${\mathit{K}}_{\mathrm{D}}$ of circular CFST columns with debonding. The formulae extracted from the Pareto front of non-dominated solutions, demonstrate good accuracy, higher than the ones in literature. The proposed models are consistent with the physical interpretation of the studied phenomenon according to which ${\mathit{N}}_{\mathrm{u}}$ and ${\mathit{K}}_{\mathrm{D}}$ decrease as debonding parameters increase and can be used to calculate the real resistance of CFST structures.

填充混凝土的钢管结构（CFST）由于具有许多优点，已经成为钢筋混凝土或钢结构的可行替代方案。最重要的一项是钢管提供的混凝土芯的约束作用。但是，这种有利的复合作用可能会因脱胶而减弱，因此需要可靠的配方来预测降低的最终阻力。在本文中，将对在有和没有脱胶的情况下在压缩圆形CFST色谱柱上进行的现有规格和实验测试进行综述。因此，为了了解细长比，载荷偏心率和约束因子对折减系数的综合影响，应该有更多的圆形CFST长标本进行脱胶处理（${\mathit{ķ}}_{\mathrm{d}}$）的极限承载能力（${\mathit{ñ}}_{\mathrm{ü}}$）。弧长比和周向剥离间隙厚度的综合影响${\mathit{ķ}}_{\mathrm{d}}$应通过实验测试进一步研究。此外，现有的公式${\mathit{ķ}}_{\mathrm{d}}$ 和 ${\mathit{ñ}}_{\mathrm{ü}}$预测测试结果的准确性较低，应加以改进。为此，进行了基于进化多项式回归（EPR）MOGA的方法，以获取更准确的公式${\mathit{ñ}}_{\mathrm{ü}}$ 和 ${\mathit{ķ}}_{\mathrm{d}}$带有粘结的圆形CFST色谱柱。从非支配解的Pareto前沿提取的公式显示出良好的准确性，高于文献中的公式。所提出的模型与对所研究现象的物理解释是一致的，据此，${\mathit{ñ}}_{\mathrm{ü}}$ 和 ${\mathit{ķ}}_{\mathrm{d}}$ 随着脱粘参数的增加而减小，可用于计算CFST结构的实际电阻。