Axial Compressive Behavior of Thin-Walled Concrete-Filled Double-Skin Steel Tubular Stub Columns with Connecting Strips
Publication: Journal of Structural Engineering
Volume 148, Issue 2
Abstract
Concrete-filled double-skin tubular (CFDST) columns have high fire resistance, and are widely used in the construction of electrical towers and bridges. However, previous research showed that the buckling of steel tubes can be significant in noncircular CFDST for nonuniform confinement or a large width-to-thickness ratio. The authors proposed a novel stiffened thin-walled CFDST column with steel strips welded on both inner tube and outer tube to form several closed cavities to fully utilize material strength. This paper presents an experimental study on the axial compressive behavior of this new type of stiffened thin-walled CFDST column; tests were conducted on six thin-walled CFDST columns and two steel tubes. The test results confirm that the stiffened CFDST columns have higher strength and better deformation capacity than the control columns. Moreover, the finite element (FE) model was developed to simulate the interaction between steel tubes and concrete. The average error of the FE analysis when predicting the column bearing capacity was 1.3% compared with experimental results. Finally, a strength design formula was proposed to predict the compressive strength of the stiffened thin-walled square CFDST column, which is recommended for design purposes.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge support for this research provided by the Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2019EEEVL0303), the National Natural Science Foundation of China (No. 52078079), and funding from the Chongqing Talents Plan for Young Talents (No. CQYC201905055).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Mar 18, 2021
Accepted: Sep 9, 2021
Published online: Nov 25, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 25, 2022
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