Stability performance of concrete-filled corrugated steel tubular slender columns under eccentric compression

Concrete-filled galvanized corrugated steel tube (CFCST) is a novel composite member with competitive mechanical behaviour, durability and construction convenience, which is suitable for serving as bridge piers, bottom columns, or underground piles. The basic compressive, flexural, shear, and torsional behaviours have been fully investigated; however, the stability performance of such a member under eccentric compression requires further investigation. This study, therefore, is dedicated to the stability performance of large-scale slender CFCST members, taking the slenderness ratios, loading eccentricities, and specimen types as test variables. The failure modes, deformation characteristics, axial load-deflection curves, and strain development were carefully analysed. A systematic parametric analysis has been conducted based on a validated fiber-based analytical model established previously to further investigate the effects of the expanded variables. Finally, the existing design methods were examined to address their applicability for the slender CFCST member under eccentric compression, with design suggestions proposed eventually.