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基于钢板弹性屈曲理论,提出了矩形钢管混凝土柱内设置T形加劲肋的技术措施和设计方法。对于板件宽厚比较大的矩形钢管混凝土柱,沿钢管壁纵向设置T形加劲肋,由于T形加劲肋翼缘部分包裹于混凝土内部,充分发挥加劲肋与混凝土的共同工作性能,改善钢管壁局部屈曲性能。采用能量法并考虑内部混凝土对钢管壁的侧向支撑作用,基于均匀受压四边固支板简化计算模型,推导了内设置T形加劲肋的柱壁板件临界应力计算公式。通过控制钢管壁全截面有效,并考虑加劲肋界限刚度比影响,提出了矩形钢管混凝土柱的T形加劲肋刚度限值要求。结果表明:T形加劲肋与混凝土的共同工作显著改善了钢管壁的局部屈曲性能;对于大宽厚比矩形钢管混凝土柱,通过合理设计T形加劲肋,仍可使钢管壁全截面有效,即先发生屈服而不是局部屈曲。
Based on the elastic buckling theory of steel plate, the technical measures and design methods for setting T-shaped stiffeners in concrete filled rectangular steel tubular columns are proposed. For rectangular concrete-filled steel tubular columns with large plate thickness, T-shaped stiffeners are longitudinally arranged along the steel pipe wall. Due to the T-shaped stiffener flange is partially wrapped in the concrete, the co-operation of stiffeners and concrete is fully utilized to improve the local Buckling performance. Based on the energy law and considering the lateral support effect of internal concrete on the steel pipe wall, the calculation formula of the critical stress of the column wall plate with T-shaped stiffener is deduced based on the simplified calculation model of the uniformly supported four-sided support plate. By controlling the full section of the steel tube wall and considering the effect of the limit stiffness ratio of the stiffener, the requirements for the T-shaped stiffener stiffness of the concrete filled steel tube column are proposed. The results show that the joint work of T-shaped stiffener and concrete significantly improves the local buckling performance of the steel pipe wall. For the concrete column with a large aspect ratio, the T-shaped stiffener can still make the full cross-section of the steel pipe effective, Yielding occurs instead of local buckling.