Axial compression behaviour of seawater sea sand concrete columns reinforced with hybrid FRP-stainless steel bars

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-02-16 DOI:10.1680/jmacr.22.00249

Jinjin Xu, Zhimin Wu, H. Jia, R. Yu, Q. Cao

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引用次数: 0

Abstract

Using fiber-reinforced polymer (FRP) bars instead of steel bars to reinforce concrete columns in harsh environments has become an important method for solving corrosion problems. The brittleness of FRP bars significantly reduces the ductility of columns. It has been proposed that columns can be reinforced with hybrid FRP and steel bars to improve ductility, but related research is very limited. In this research, the axial compression behaviour of seawater sea sand concrete (SSC) columns reinforced with hybrid FRP bars and stainless steel (SS) bars was studied. In total, 84 SSC columns were designed, including 15 SS reinforced SSC (SS-SSC) columns, 15 glass-FRP (GFRP) reinforced SSC (GFRP-SSC) columns, 45 hybrid FRP-SS reinforced SSC (FRP-SS-SSC) columns and nine plain SSC columns. The failure modes, load-axial displacement curves, bearing capacity, and ductility were analyzed with consideration of the effects of the reinforcement types, reinforcement ratios, and concrete strength. The results showed that ductility could be significantly improved by hybrid reinforcements, and the ductility indexes of the FRP-SS-SSC columns were close to those of the SS-SSC columns. The proposed equation could accurately predict the bearing capacity of SSC columns Furthermore, the theoretical stress-strain relationship for the studied axial compression SSC columns was proposed.

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frp -不锈钢混合筋配筋海水-海砂混凝土柱轴压特性

在恶劣环境中使用纤维增强聚合物（FRP）钢筋代替钢筋加固混凝土柱已成为解决腐蚀问题的重要方法。FRP筋的脆性显著降低了柱的延性。有人提出可以用玻璃钢和钢筋混合加固柱以提高延性，但相关研究非常有限。在本研究中，研究了混杂FRP筋和不锈钢筋加固的海水海砂混凝土（SSC）柱的轴压性能。共设计了84根SSC柱，包括15根SS加固SSC（SS-SSC）柱、15根玻璃钢（GFRP）加固SSC（GFRP-SSC）柱、45根FRP-SS加固SSC混合柱和9根素SSC柱。考虑钢筋类型、配筋率和混凝土强度的影响，分析了破坏模式、荷载-轴向位移曲线、承载力和延性。结果表明，混合配筋可以显著提高延性，FRP-SS-SSC柱的延性指标与SS-SSC柱接近。该方程可以准确地预测SSC柱的承载力。此外，还提出了所研究的轴压SSC柱的理论应力-应变关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.