Abstract The use of stainless steel in steel-concrete composite construction is an emerging topic considering the higher durability, corrosion resistance, and fire resistance as well as aesthetic benefits and ease of maintenance of stainless steel compared to carbon steel. In line with this, the present paper reports the results of a series of experimental and numerical investigations on the local and post-local buckling of austenitic stainless steel-concrete composite columns with an aim to propose axial slenderness limits as well as effective width/diameter formulae for these members. Such limits have not yet been established for stainless steel-concrete composite members in international design standards. Three section types, namely, concrete-filled box, concrete-filled circular, and partially-encased I-sections are thoroughly studied. The investigated columns include some of the largest and most slender stainless steel-concrete composite sections studied to date. The obtained results are compared with theory as well as approaches currently in use by international design standards. It is demonstrated that the codified slenderness limits developed for carbon steel-concrete composite columns cannot be directly used for the stainless steel counterparts and modifications are required. The modifications are recommended in light of the findings of the present study. In addition to axial slenderness limits, effective width/diameter formulae are also recommended for the studied section types.

中文翻译：

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奥氏体不锈钢-混凝土组合柱的轴向细长极限

摘要 考虑到不锈钢与碳钢相比，不锈钢具有更高的耐用性、耐腐蚀性和耐火性以及美观和易于维护，因此在钢-混凝土复合结构中使用不锈钢是一个新兴话题。为此，本文报告了对奥氏体不锈钢-混凝土组合柱局部和后局部屈曲的一系列实验和数值研究的结果，旨在提出轴向细长限制以及有效宽度/直径这些成员的公式。国际设计标准中尚未为不锈钢-混凝土组合构件制定此类限制。深入研究了三种截面类型，即填充混凝土的箱形截面、填充混凝土的圆形截面和部分包裹的 I 形截面。研究的柱子包括迄今为止研究过的一些最大和最细长的不锈钢-混凝土组合截面。将获得的结果与国际设计标准目前使用的理论和方法进行比较。结果表明，为碳钢-混凝土组合柱制定的编码细长限制不能直接用于不锈钢对应物，需要进行修改。根据本研究的结果，建议进行修改。除了轴向细长限制外，还建议对所研究的截面类型使用有效宽度/直径公式。将获得的结果与国际设计标准目前使用的理论和方法进行比较。结果表明，为碳钢-混凝土组合柱制定的编码细长限制不能直接用于不锈钢对应物，需要进行修改。根据本研究的结果，建议进行修改。除了轴向细长限制外，还建议对所研究的截面类型使用有效宽度/直径公式。将获得的结果与国际设计标准目前使用的理论和方法进行比较。结果表明，为碳钢-混凝土组合柱制定的编码细长限制不能直接用于不锈钢对应物，需要进行修改。根据本研究的结果，建议进行修改。除了轴向细长限制外，还建议对所研究的截面类型使用有效宽度/直径公式。