Details
| Original language | English |
|---|---|
| Article number | 109107 |
| Number of pages | 15 |
| Journal | Structures |
| Volume | 77 |
| Early online date | 9 May 2025 |
| Publication status | Published - Jul 2025 |
Abstract
A novel composite system of self-prestressed iron-based shape memory alloy (Fe-SMA) spiral stirrups reinforced ultra-high performance concrete (UHPC) columns is proposed in this study. Fe-SMA stirrups were activated using high-temperature autoclave curing, which simultaneously enhanced the strength of the UHPC matrix and induced active circumferential confinement. Axial compression tests were conducted on 27 circular short columns to investigate the effects of the prestress levels in Fe-SMA stirrups, stirrup spacing, curing conditions, and concrete types. The results revealed that the brittleness of the UHPC was mitigated by the active confinement provided by the Fe-SMA spiral stirrups. After the initial load peak, the specimens exhibited a prolonged load-strengthening phase that enhanced compressive deformation capacity and ductility. Autoclave curing improved both the mechanical properties of the UHPC matrix and the confinement effect of the Fe-SMA stirrups. A calculation method is proposed to predict the ultimate load-bearing capacity of Fe-SMA reinforced UHPC columns and validated, thereby providing a reliable reference for design applications. This study highlights the potential of self-prestressed Fe-SMA reinforcements for enhancing the performance and practical applicability of UHPC columns in high-performance structural systems.
Keywords
- Active confinement, Autoclave curing, Axial compression behavior, Iron-based shape memory alloy (Fe-SMA), Self-prestressing, Ultra-high performance concrete (UHPC)
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Architecture
- Engineering(all)
- Building and Construction
- Engineering(all)
- Safety, Risk, Reliability and Quality
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In: Structures, Vol. 77, 109107, 07.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Axial compressive behavior of UHPC columns reinforced with self-prestressed Fe-SMA spiral stirrups
AU - Cui, Chushi
AU - Dong, Zhiqiang
AU - Zhu, Hong
AU - Zhao, Yifan
AU - Han, Tianhao
AU - Pan, Yijie
AU - Ghafoori, Elyas
N1 - Publisher Copyright: © 2025 Institution of Structural Engineers
PY - 2025/7
Y1 - 2025/7
N2 - A novel composite system of self-prestressed iron-based shape memory alloy (Fe-SMA) spiral stirrups reinforced ultra-high performance concrete (UHPC) columns is proposed in this study. Fe-SMA stirrups were activated using high-temperature autoclave curing, which simultaneously enhanced the strength of the UHPC matrix and induced active circumferential confinement. Axial compression tests were conducted on 27 circular short columns to investigate the effects of the prestress levels in Fe-SMA stirrups, stirrup spacing, curing conditions, and concrete types. The results revealed that the brittleness of the UHPC was mitigated by the active confinement provided by the Fe-SMA spiral stirrups. After the initial load peak, the specimens exhibited a prolonged load-strengthening phase that enhanced compressive deformation capacity and ductility. Autoclave curing improved both the mechanical properties of the UHPC matrix and the confinement effect of the Fe-SMA stirrups. A calculation method is proposed to predict the ultimate load-bearing capacity of Fe-SMA reinforced UHPC columns and validated, thereby providing a reliable reference for design applications. This study highlights the potential of self-prestressed Fe-SMA reinforcements for enhancing the performance and practical applicability of UHPC columns in high-performance structural systems.
AB - A novel composite system of self-prestressed iron-based shape memory alloy (Fe-SMA) spiral stirrups reinforced ultra-high performance concrete (UHPC) columns is proposed in this study. Fe-SMA stirrups were activated using high-temperature autoclave curing, which simultaneously enhanced the strength of the UHPC matrix and induced active circumferential confinement. Axial compression tests were conducted on 27 circular short columns to investigate the effects of the prestress levels in Fe-SMA stirrups, stirrup spacing, curing conditions, and concrete types. The results revealed that the brittleness of the UHPC was mitigated by the active confinement provided by the Fe-SMA spiral stirrups. After the initial load peak, the specimens exhibited a prolonged load-strengthening phase that enhanced compressive deformation capacity and ductility. Autoclave curing improved both the mechanical properties of the UHPC matrix and the confinement effect of the Fe-SMA stirrups. A calculation method is proposed to predict the ultimate load-bearing capacity of Fe-SMA reinforced UHPC columns and validated, thereby providing a reliable reference for design applications. This study highlights the potential of self-prestressed Fe-SMA reinforcements for enhancing the performance and practical applicability of UHPC columns in high-performance structural systems.
KW - Active confinement
KW - Autoclave curing
KW - Axial compression behavior
KW - Iron-based shape memory alloy (Fe-SMA)
KW - Self-prestressing
KW - Ultra-high performance concrete (UHPC)
UR - http://www.scopus.com/inward/record.url?scp=105004568023&partnerID=8YFLogxK
U2 - 10.1016/j.istruc.2025.109107
DO - 10.1016/j.istruc.2025.109107
M3 - Article
AN - SCOPUS:105004568023
VL - 77
JO - Structures
JF - Structures
SN - 2352-0124
M1 - 109107
ER -