Abstract
Concrete-filled double-skin steel tubular (CFDST) members have been proven through many years of research as a competitive structural concept in comparison with conventional steel tubular members or concrete-filled steel tubular members (CFST), as well as an apt example of efficient composite action between the two materials. In this study, the compressive behavior of stub CFDST members is investigated through a meticulous review of numerous experimental endeavors over a 20-year time span. A summary of these tests and their pertinent results is presented, followed by an exploration of their structural response and predominant failure mechanisms for different cross-section shapes and geometrical factors. The efficiency of the CFDST concept is subsequently quantified by means of a comparison between CFDST members and their components acting individually, in terms of both ultimate strength and energy absorption. An extensive parametric analysis is finally carried out with respect to the influence of various key-factors on axially-compressed CFDST stub members' structural performance.
Published Version
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