Concrete filled double skin tubular members subjected to bending

Kojiro Uenaka, Hiroaki Kitoh and Keiichiro Sonoda

Abstract

A concrete filled double skin tubular (called CFDST in abbreviation) member consists of two concentric circular steel tubes and filled concrete between them. Purpose of this study is to investigate their bending characteristics experimentally. The two test parameters of the tubes considered were an inner-to-outer diameter ratio and a thickness-diameter ratio. As a result, their observed failure modes were controlled by tensile cracking or local buckling of the outer tube. Discussion is focused on the confinement effect on the filled concrete due to the both tubes and also the influence of the inner-to-outer diameter ratios on their deformability and load carrying capacity.

Key Words

composite columns; concrete filled double tubular steel member; bending moment capacity; confined effect.

Address

Kojiro Uenaka : Dept. of Civil Engineering, Kobe City College of Technology Gakuenhigashimachi 8-3, Nishi, Kobe, 651-2194, Japan Hiroaki Kitoh : Dept. of Urban Engineering, Osaka City University, Japan Keiichiro Sonoda : Professor, Emeritus Osaka City University, Japan

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