Push-out tests and bond strength of rectangular CFST columns
Open accessAbstract
Push-out tests have been conducted on 18 rectangular concrete-filled steel tubular (CFST) columns with the aim of studying the bond behaviour between the steel tube and the concrete infill. The obtained load-slip response and the distribution of the interface bond stress along the member length and around the cross-section for various load levels, as derived from measured axial strain gradients in the steel tube, are reported. Concrete compressive strength, interface length, cross-sectional dimensions and different interface conditions were varied to assess their effect on the ultimate bond stress. The test results indicate that lubricating the steel-concrete interface always had a significant adverse effect on the interface bond strength. Among the other variables considered, concrete compressive strength and cross-section size were found to have a pronounced effect on the bond strength of non-lubricated specimens for the range of cross-section geometries considered, which is not reflected in the European structural design code for composite structures, EN 1994-1-1 (2004). Finally, based on nonlinear regression of the test data generated in the present study, supplemented by additional data obtained from the literature, an empirical equation has been proposed for predicting the average ultimate bond strength for SHS and RHS filled with normal strength concrete.
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Concrete grade and cross-section dimensions of tubes have a significant influence on the value of bond strengths in non-lubricated elements.
“In addition, it was concluded that concrete grade and cross-section dimensions of tubes have a significant influence on the value of bond strengths in non-lubricated elements.”
From Analysis of shrinkage influence on bond in CFST elements filled with SCC (2021) · cites this paper as Qu et al. [11]
There is no consistent conclusion regarding the influence of concrete strength on the bond strength of concrete-filled steel tubes.
“Regarding the influence of concrete strength on the bond strength, there is no consistent conclusion.”
From Bond stress-slip relationship in concrete-filled square stainless steel tubes (2022) · cites this paper as [15]
Some studies found that higher concrete strength may improve bond strength of concrete-filled steel tubes, whereas Yan et al. reached the opposite conclusion.
“Xue and Cai [4,5], Chang et al. [14] and Qu et al. [15] found that the higher concrete strength may improve the bond strength, whereas Yan et al. [16] reached the opposite conclusion.”
From Bond stress-slip relationship in concrete-filled square stainless steel tubes (2022) · cites this paper as [15]
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Bond behaviour of round-ended recycled aggregate concrete filled steel tube (RE-RACFST) columns
Li, X., Wang, R., Zhao, H., Chen, M.-T., & Lam, D. (2023) · Journal of Constructional Steel Research · doi:10.1016/j.jcsr.2022.107700 · Cited by 28 · see citing works
Analysis of shrinkage influence on bond in CFST elements filled with SCC
Szadkowska, M., & Szmigiera, E. (2021) · Journal of Constructional Steel Research · doi:10.1016/j.jcsr.2021.106824 · Cited by 17 · see citing works
Study on the Bond-Slip Performance of CFSSTs Based on Push-Out Tests
Wang, L., Chen, H., Zhong, J., Chen, H., Xuan, W., Mi, S., & Yang, H. (2018) · Advances in Materials Science and Engineering · doi:10.1155/2018/2959827 · Cited by 13 · see citing works
- Authors
- Qu, X., Chen, Z., Nethercot, D. A., Gardner, L., & Theofanous, M.
- Affiliations
- Tianjin University (CN)
- Imperial College London (GB)
- University of Birmingham (GB)
- Venue
- Steel and Composite Structures
- Publisher
- Techno-Press
- Published
- 2015-07-25
- Volume
- 19
- Issue
- 1
- Pages
- 21-41
- ISSN
- 1229-9367 (ISSN-L)
- OpenAlex
- W2407842568
- Cited by
- 49
- References
- 25
- Citations by year
- 2026: 8 · 2025: 3 · 2024: 7 · 2023: 5 · 2022: 10 · 2021: 5 · 2020: 3 · 2019: 1 · 2018: 1 · 2017: 6
- FWCI
- 3.86
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Steel and Composite Structures (publishedVersion)
- University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
- Spiral (Imperial College London) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Structural Load-Bearing Analysis
- Physical Sciences › Engineering › Building and Construction › Structural Behavior of Reinforced Concrete
- Physical Sciences › Engineering › Civil and Structural Engineering › Fire effects on concrete materials
- Keywords
- concrete-filled steel tube columns, push-out test, load-slip behavior, concrete compressive strength, cross-section dimensions, rectangular hollow sections, EN 1994-1-1
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