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Stainless steel has increasingly been utilized in concrete‐filled composite columns because of its high corrosion resistance and aesthetic appearance. However, there is little published information on the structural behavior of concrete‐filled double‐skin steel tubular (CFDST) columns made of square outer stainless‐steel skin and circular inner carbon steel tubes. The present study focuses on the nonlinear analysis of axially loaded CFDST short columns with outer square stainless steel tube and inner circular carbon steel tube. The explicit analysis methodology is adopted to develop the finite element model of CFDST columns. The verified model is employed to undertake a parametric study on the geometric and material effects on the performance of CFDST columns. The findings indicate that the outer tube diameter‐to‐thickness should be maintained <40 to ensure the required plastic resistance of CFDST columns with hollow ratio in range from 0.34 to 0.42. The design equation for calculating the ultimate axial strength of CFDST columns with outer stainless steel is proposed.

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where the maximum is taken over all z k ∈ E, k = 1, 2, . . . , n. We prove that if n = 5, then the Reuleaux n-gons have the largest n-diameter among all sets of given constant width. The proof is based on the solution of an extremal problem for n-diameter. MSC2010: primary 30C65; secondary 05C25.