自预应力铁- sma螺旋箍筋加固UHPC柱轴压性能

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Chushi Cui , Zhiqiang Dong , Hong Zhu , Yifan Zhao , Tianhao Han , Yijie Pan , Elyas Ghafoori
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引用次数: 0

摘要

提出了一种新型的自预应力铁基形状记忆合金(Fe-SMA)螺旋箍筋与超高性能混凝土(UHPC)柱复合体系。Fe-SMA马镫采用高温高压罐固化激活,同时增强了UHPC基体的强度,并诱导了主动周向约束。对27根圆形短柱进行了轴压试验,研究了Fe-SMA箍筋预应力水平、箍筋间距、养护条件和混凝土类型的影响。结果表明,Fe-SMA螺旋箍箍提供的主动约束减轻了UHPC的脆性。在初始荷载峰值后,试件表现出延长的荷载强化阶段,增强了压缩变形能力和延性。热压釜固化既改善了UHPC基体的力学性能,又改善了Fe-SMA马镫的约束效应。提出了一种预测Fe-SMA加筋UHPC柱极限承载力的计算方法,并进行了验证,为设计应用提供了可靠的参考。本研究强调了自预应力Fe-SMA增强在高性能结构体系中提高UHPC柱的性能和实际适用性的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.
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来源期刊
Structures
Structures Engineering-Architecture
CiteScore
5.70
自引率
17.10%
发文量
1187
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.
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