The structural behaviour of concrete-filled steel tubular columns subjected to full and local compression loads was investigated. Experiments were performed on 18 columns with different cross-sectional slenderness ratios. The experimental parameters were the local compression area ratio and the slenderness ratio. The strength index, stiffness and ductility index of the columns were obtained through experimental tests. The results revealed that the local compression area ratio and slenderness ratio are key parameters that considerably affect the strength capacity of columns subjected to full and local compression loads. Design models provided in various international codes and various studies were used to validate the experimental results. Furthermore, the suitability of these design models for predicting the strength capacity of columns subjected to full and local compression loads was examined. Finally, through regression analysis, a simplified design model was developed for predicting the strength capacity of columns under full and local compression loads.

中文翻译：

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全压和局部受压荷载下钢管混凝土柱设计模型

研究了承受全部和局部压缩载荷的钢管混凝土柱的结构行为。在 18 根不同横截面长细比的柱子上进行了实验。实验参数为局部压缩面积比和长细比。柱的强度指数、刚度和延性指数是通过实验测试得到的。结果表明，局部受压面积比和长细比是显着影响柱承受全和局部压缩载荷的强度能力的关键参数。各种国际规范和各种研究中提供的设计模型被用来验证实验结果。此外，检查了这些设计模型在预测柱承受全部和局部压缩载荷的强度能力方面的适用性。最后，通过回归分析，建立了一个简化的设计模型，用于预测柱在全载荷和局部压缩载荷下的承载能力。