Flexural Behavior of High-Strength Rectangular Concrete-Filled Steel Tube Members
Publication: Journal of Structural Engineering
Volume 148, Issue 1
Abstract
This study experimentally and numerically investigates the flexural behavior of high-strength rectangular concrete-filled steel tube (CFST) members. An experimental database including 30 flexural tests on high-strength rectangular CFST members was compiled, and gaps in the existing research were identified. To address these gaps, a total of 14 specimens were tested, considering the effect of tube thickness, compressive strength of concrete, yield stress of steel, and tube height. Detailed finite-element models were also developed and benchmarked for parametric studies. Results from the tests and finite-element analyses indicated the following: (1) the flexural strength increased with the increasing tube thickness, yield stress of steel, tube height, and tube width, while the effect of the compressive strength of concrete was minor; (2) the flexural stiffness increased with the increasing tube thickness, tube height, and tube width, while the effect of the yield stress of steel and compressive strength of concrete was minor; and (3) high-strength CFST members, especially those with high-strength steel tubes, had lower ductility compared with conventional-strength CFST members. Experimental and numerical results were also used to evaluate the applicability of current design provisions (i.e., AISC 360-16, GB 50936-2014, Eurocode 4, and the AIJ) for estimating the flexural strength and stiffness. The evaluation showed that AISC 360-16 reasonably estimated the flexural strength, while AIJ provided the most accurate estimation of the service-level flexural stiffness.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 51978170), the Fujian Provincial Department of Science and Technology (Grant No. 2020J05126), and the Department of Education of Fujian Province (Grant No. JAT190045).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 5, 2021
Accepted: Jul 26, 2021
Published online: Oct 20, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 20, 2022
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