FRP–Concrete–Steel Double-Skin Tubular Columns with UHPC/ECC: Concept and Compressive Behavior under Concentric Loading
Publication: Journal of Composites for Construction
Volume 27, Issue 3
Abstract
This study presents the results of a comprehensive experimental program on the compressive behavior of hybrid fiber-reinforced polymer (FRP)–concrete–steel double-skin tubular columns (DSTCs) filled with ultrahigh-performance concrete (UHPC) or engineered cementitious composites (ECC). The use of UHPC or ECC, being a novel engineering material with unique characteristics, leads to many advantages of such hybrid DSTCs compared with conventional hybrid DSTCs with normal strength concrete (NSC). Particularly, the tendency of cracking of the FRP tube and NSC in conventional hybrid DSTCs could be reduced through the use of ECC with high tensile ductility and high tensile toughness, leading to excellent corrosion resistance. To understand the compressive behavior of DSTCs with UHPC or ECC, 12 DSTC specimens with different types of concretes (i.e., NSC, UHPC, and ECC) were prepared and tested, and the test results are presented in this paper. The test results demonstrated that DSTC specimens with UHPC or ECC could exhibit highly ductile behavior when a sufficiently large FRP confinement is provided, but the expected beneficial effects of fibers in UHPC or ECC are insignificant in the axial compressive behavior of DSTC specimens. Finally, the axial load resistances of different components of the test hybrid DSTC specimens were investigated, which demonstrated the beneficial effect of interaction of different components in the hybrid system, especially for DSTC–NSC and DSTC–ECC specimens.
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Acknowledgments
The authors are grateful for the financial support received from the National Natural Science Foundation of China (Project No. 51978261), the Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology (Project No. 2021B1212040003), and the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 25203420).
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Journal of Composites for Construction
Volume 27 • Issue 3 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 24, 2022
Accepted: Dec 13, 2022
Published online: Feb 22, 2023
Published in print: Jun 1, 2023
Discussion open until: Jul 22, 2023
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