Chushi Cui , Zhiqiang Dong , Hong Zhu , Yifan Zhao , Tianhao Han , Yijie Pan , Elyas Ghafoori
{"title":"自预应力铁- sma螺旋箍筋加固UHPC柱轴压性能","authors":"Chushi Cui , Zhiqiang Dong , Hong Zhu , Yifan Zhao , Tianhao Han , Yijie Pan , Elyas Ghafoori","doi":"10.1016/j.istruc.2025.109107","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109107"},"PeriodicalIF":4.3000,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Axial compressive behavior of UHPC columns reinforced with self-prestressed Fe-SMA spiral stirrups\",\"authors\":\"Chushi Cui , Zhiqiang Dong , Hong Zhu , Yifan Zhao , Tianhao Han , Yijie Pan , Elyas Ghafoori\",\"doi\":\"10.1016/j.istruc.2025.109107\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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.</div></div>\",\"PeriodicalId\":48642,\"journal\":{\"name\":\"Structures\",\"volume\":\"77 \",\"pages\":\"Article 109107\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2025-05-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S235201242500921X\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S235201242500921X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
Axial compressive behavior of UHPC columns reinforced with self-prestressed Fe-SMA spiral stirrups
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.
期刊介绍:
Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.