Abstract
Proposed herein is a new type of concrete-filled double skin steel tube (CFDST) that uses webs to connect the inner and outer steel tubes so as to increase the collaborative performance of this column. The outer square steel tube was formed by welding steel plate and T-shaped section, while the webs of T-shaped steel were also welded on the inner steel tube as stiffeners. Based on past experiments, the finite element model (FEM) of CFDST under axial loading was established and verified by comparing against the results from tests. The verified FE models were developed to analyze the compressive behavior of these new stub columns. The effects of stiffener (number and thickness), width-to-thickness (Bo/to) ratios and hollow ratio on the compressive behavior were studied. It was found that stiffeners could delay local buckling of the tube and change its mode and stress path.
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