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Nonlinear analysis of circular concrete-filled steel tube columns under eccentric loading

机译：圆形钢管混凝土柱在偏心荷载作用下的非线性分析

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In this paper, the mechanical behaviours of circular concrete-filled steel tube (CFST) columns were numerically investigated with the Abaqus/standard solver software. Based on the analysis of contact stress between the core concrete and the steel tube, it was found that the contact stress was non-uniformly distributed for CFST columns under eccentric loading, which is quite different from CFST columns under axial loading. A new concrete constitutive model, which considered the influence of eccentricity and depicted all loading stages, was developed. Existing experimental results were employed to validate the proposed constitutive model. It is concluded that the current model proposed in this paper is accurate in simulating the eccentric behaviour of CFST columns. Parameter study was also conducted to examine the effect of steel tube ratio (alpha(s)), yield strength of steel tube (f(y)(t)) and compression strength of core concrete (f(cu)(c)) on the mechanical behaviours of the CFST column under eccentric loading.
机译：在本文中，使用Abaqus / standard求解器软件对圆形钢管混凝土（CFST）柱的力学性能进行了数值研究。通过对核心混凝土与钢管之间的接触应力分析，发现CFST柱在偏心荷载作用下的接触应力分布不均匀，这与CFST柱在轴向荷载作用下的接触应力有很大的不同。开发了一种新的混凝土本构模型，该模型考虑了偏心率的影响并描绘了所有加载阶段。现有的实验结果被用来验证所提出的本构模型。结论是，本文提出的当前模型在模拟CFST柱的偏心行为方面是准确的。还进行了参数研究，以检验钢管比（α），钢管屈服强度（f（y）（t））和芯混凝土抗压强度（f（cu）（c））对混凝土的影响。 CFST柱在偏心载荷下的力学行为。

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