Seismic performance of SFCBs reinforced UHPC-filled steel tube composite columns: Test, modeling and theoretical analysis
Ge, W. Zhang, Z. Jiang, H. Chan, Y.W.S.
Ge, W.
Zhang, Z.
Jiang, H.
Chan, Y.W.S.
Publication Date
2025
End of Embargo
Supervisor
Rights
© 2025 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Peer-Reviewed
Yes
Open Access status
embargoedAccess
Accepted for publication
2025-02-15
Institution
Department
Awarded
Embargo end date
2027-02-15
Additional title
Abstract
This paper explores the seismic behavior of a novel composite column, specifically designed to address the issues of rapid stiffness degradation and significant residual deformation that commonly occur in conventional concrete-filled steel tube (CFST) columns under low cycle reversed loading. The proposed composite column comprises of ultra-high performance concrete (UHPC) filled steel tubes (UHPCFST) reinforced with steel-FRP composite bars (SFCBs), which collectively enhance the structural performance under low reversed cyclic loading. The seismic performance of SFCBs-UHPCFST composite columns was investigated by conducting low-cyclic reversed loading tests and finite element modeling, analyzing the effects of strength of concrete and steel tube, type of longitudinal reinforcement, axial compression ratio, slenderness ratio, ratio of longitudinal bars and stirrups. The results indicated that all composite columns exhibited compression-bending failure. Compared with conventional steel-reinforced UHPCFST columns, SFCBs reinforced columns showed slightly lower bearing capacity but demonstrated superior deformation capacity, lower residual deformations, higher energy dissipation capacity, smaller degradation of stiffness and bearing capacity, and better reparability. Increasing concrete strength, reinforcement ratio, or steel yield strength, or reducing the slenderness ratio effectively enhanced the loading capacity and initial stiffness of SFCBs-UHPCFST composite columns, while increasing the stirrup ratio had a limited effect. With the axial compression ratio improved from 0.15 to 0.25, the bearing capacity of SFCBs-UHPCFST composite columns increased; however, when the ratio improved from 0.25 to 0.35 and 0.45, the bearing capacity significantly reduced, second-order P-Δ effects became more pronounced, and the stiffness degradation rate increased. Finally, a hysteretic model for the SFCBs-UHPCFST composite columns was established based on a degraded trilinear model, with predicted values fitting well with experimental results, accurately reflecting the hysteretic behavior of SFCBs-UHPCFST composite columns.
Version
Accepted manuscript
Citation
Ge W, Zhang Z, Ashour A et al (2025) Seismic performance of SFCBs reinforced UHPC-filled steel tube composite columns: Test, modeling and theoretical analysis. Journal of Building Engineering. 112166. Accepted for publication.
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Article
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Notes
The full-text of this article will be released for public view at the end of the publisher embargo on 15 Feb 2027.