Improved Composite Effect of Square Concrete-Filled Steel Tubes with Diagonal Binding Ribs
Publication: Journal of Structural Engineering
Volume 145, Issue 10
Abstract
This paper proposes a scheme to improve the structural behavior of square concrete-filled steel tubular (CFST) columns, in which diagonal binding ribs are welded at all the four pairs of adjacent sides of the square tube. Thus, both the confinement from the stiffened square steel tube to the infilled concrete and local buckling behavior of the tube can be enhanced. The diagonal binding ribs made of perforated thin-walled steel plates can facilitate concreting and enhance the integrity of the columns. This kind of composite columns is called diagonal rib–stiffened square CFST columns in this paper. Nineteen specimens with the tube width:thickness ratios between 50 and 150 were tested under axial compression to investigate the effect of thicknesses, opening dimensions and opening shapes of the stiffeners. In addition, square CFST specimens without stiffeners and octagonal CFST specimens and square CFST specimens with longitudinal stiffeners on each tube face were also tested for comparison. Test results showed that the diagonal binding ribs can improve the composite effect effectively by cocarrying the axial compression force and confining both the steel tube and concrete. The diagonal binding ribs can increase load-carrying capacity by 10%–20% and ductility by 30% or more compared with the CFST specimens without stiffeners. The diagonal rib–stiffened square CFST columns also behaved better than the octagonal CFST specimens and square CFST specimens with longitudinal stiffeners. Finally, two calculating methods which well predict the axial load-carrying capacities of diagonal ribs stiffened square CFST columns are recommended.
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Acknowledgments
The authors greatly appreciate the financial support provided by the National Natural Science Foundation of China (Nos. 51878097 and 51890902), and the Fundamental Research Funds for the Central Universities (No. 2018CDQYTM0043). However, the opinions expressed in this paper are solely the authors’ own.
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Information
Published In
Journal of Structural Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 6, 2018
Accepted: Mar 3, 2019
Published online: Aug 10, 2019
Published in print: Oct 1, 2019
Discussion open until: Jan 10, 2020
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