Concrete-filled double skin (SHS outer and CHS inner) steel tubular beam-columns

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Comparative experimental study of hot-rolled and cold-formed rectangular hollow sections (2010, result): “4 Compression test results The results from the 20 stub column tests described herein were combined with those from other studies [16, 30-35] to assess the Class 3 slenderness limit specified in Eurocode 3 [22].”
The continuous strength method (2008, background): “Therefore, in order to derive a relationship between deformation capacity and cross-section slenderness, equations (3) and (4) have to be modified to allow for effects including inelastic buckling, imperfections, residual stresses and post-buckling behaviour.”