Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
Open accessAbstract
This paper presents an experimental investigation of flexural behavior of circular ultra-high-performance concrete with coarse aggregate (CA-UHPC)-filled steel tubes (CA-UHPCFSTs). A total of seven flexural members were tested under a four-point bending load. The failure modes, overall deflection curves, moment-versus-curvature relationships, moment-versus-strain curves, strain distribution curves, ductility, flexural stiffness and ultimate flexural capacity were evaluated. The results indicate that the CA-UHPCFSTs under bending behaved in a good ductile manner. The CA-UHPC strength has a limited effect on the ultimate flexural capacity, while the addition of steel fiber can improve the ultimate flexural capacity. Increasing the steel tube thickness leads to higher flexural stiffness and ultimate flexural capacity. There is a significant confinement effect between the steel tube and the CA-UHPC core in the compressive zone and centroidal plane after the specimen enters the elastic-plastic stage, while the confinement effect in the tensile zone is minimal. Moreover, the measured flexural stiffness and ultimate flexural capacity were compared with the predictions using various design specifications. Two empirical formulas for calculating the initial and serviceability-level flexural stiffness of CA-UHPCFSTs are developed. Further research is required to propose the accurate design formula for the ultimate flexural capacity of CA-UHPCFSTs.
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The use of steel fibers in UHPC-filled steel tube members can significantly improve the ductility, compressive ultimate bearing capacity, and flexural ultimate bearing capacity of these members.
“The use of steel fibers in UHPC-filled steel tube (UHPC-FST) members can significantly improve the ductility, as well as compressive and flexural ultimate bearing capacity, of these members [19,20,21,22,23].”
From Bond-Slip Performances of Ultra-High Performance Concrete Steel Tube Columns Made of a Large-Diameter Steel Tube with Internally Welded Steel Bars (2023) · cites this paper as [21]
Section 3.7 reports a 13.8% increase in ductility index with steel fibers, and Section 3.5 reports a 25.6% increase in ultimate flexural capacity. The paper tests members under bending, not their ultimate compressive bearing capacity, so that part of the claim is unsupported. (LLM, conf=0.90)
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Self-citation
- Authors
- Wu, F., Zeng, Y., Li, B., & Lyu, X.
- Affiliations
- Foshan University (CN)
- Wuhan University (CN)
- Corresponding author
- Wu, Fanghong
- Li, Ben
- Venue
- Materials
- Publisher
- MDPI AG
- Published
- 2021-10-24
- Volume
- 14
- Issue
- 21
- Pages
- 6354
- ISSN
- 1996-1944 (ISSN-L)
- PMC
- PMC8585296
- OpenAlex
- W3209574815
- Cited by
- 15
- References
- 30
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 1 · 2023: 5 · 2022: 2
- FWCI
- 1.03
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Materials (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (51738011)
- Key Project of National Natural Science Foundation of China (51978538)
- Science and Technology Innovation Platform of Foshan City, Guangdong Province, China (2016AG100341)
- 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 › Innovative concrete reinforcement materials
- Keywords
- ultra-high performance concrete, flexural behavior, four-point bending, moment-curvature relationship, ductility, bending stiffness, ultimate flexural capacity, steel fibers, confinement effects, steel tube thickness, design specifications, empirical formula
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