Cyclic loading test for UHPC-filled steel tube composite columns reinforced with steel-FRP composite bars
Zhang, Z. Ge, W. Jiang, H. Tu, Y.
Zhang, Z.
Ge, W.
Jiang, H.
Tu, Y.
Publication Date
2025-08-20
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© 2025 The Authors. This is the Author Accepted Manuscript of the article distributed under the Creative Commons CC-BY license (https://creativecommons.org/licenses/by/4.0) in accordance with the University of Bradford Rights Retention Policy.
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openAccess
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2025-08-18
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Abstract
To enhance the post-earthquake repairability of concrete-filled steel tube (CFST) columns, this study introduces a novel steel-FRP composite bars (SFCBs) reinforcing ultra-high-performance concrete (UHPC)-filled steel tube composite (UHPCFST) column. The seismic performance of these UHPCFST composite columns was investigated through cycle loading tests. The results indicated that replacing normal strength concrete with UHPC and increasing the SFCB reinforcement ratio can significantly enhance the seismic performance of composite columns. An increase in the SFCB’s reinforcement ratio from 3 % to 4 % improves the overall performance by 27.6 %, with a minimal cost increase of only 1.8 %, demonstrating the high cost-effectiveness of SFCB reinforcement. Furthermore, an increased axial load ratio enhances the bearing capacity, initial stiffness, and energy dissipation capacity of the columns. However, excessively high axial loads accelerate stiffness degradation and worsen post-earthquake reparability. Compare to steel bar-reinforced UHPCFST composite column, SFCB-reinforced UHPCFST composite column shows superior performance, exhibiting slower performance degradation and better post-earthquake repairability. Finally, a restoring force model for UHPCFST composite columns was developed based on theoretical modeling and regression analysis, which demonstrates excellent consistency with experimental results.
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Accepted manuscript
Citation
Zhang Z, Ashour A, Ge W, et al (2025) Cyclic loading test for UHPC-filled steel tube composite columns reinforced with steel-FRP composite bars. Structures. 80: 110005.
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