Bond behavior and bond strength model for ribbed FRP bar in FRP-confined concrete

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-09-17 DOI:10.1016/j.conbuildmat.2024.138318

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Abstract

In this paper, an experimental study is conducted to gain insight into the bond behavior of ribbed fiber-reinforced polymer (FRP) bar in FRP-confined concrete. Various parameters, including the ratio of concrete cover to bar diameter, concrete strength, and FRP confinement level, are considered in this study. The test results demonstrate the effectiveness of FRP confinement in changing the bond failure mode of FRP bar from the concrete splitting to the pullout and improving bond ductility and strength. The bond response of ribbed FRP bar in FRP-confined concrete is characterized by three distinct stages: uncracked stage, cracking enhancement stage, and cracking degradation stage. The bond mechanism within each stage is elucidated. The study reveals that the normalized bond strength is distinctly influenced by the ratio of concrete cover to diameter and FRP confinement level, while concrete strength exhibits a negligible impact. Finally, the study proposes a novel model for predicting the bond strength of the ribbed FRP bar embedded in both unconfined and FRP-confined concrete.

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带肋玻璃钢条在玻璃钢约束混凝土中的粘结行为和粘结强度模型

本文进行了一项实验研究，以深入了解带肋纤维增强聚合物（FRP）条在 FRP 密实混凝土中的粘结行为。本研究考虑了各种参数，包括混凝土覆盖层与钢筋直径之比、混凝土强度和 FRP 约束水平。试验结果表明，FRP 约束能有效地将 FRP 杆件的粘结破坏模式从混凝土劈裂转变为拉出，并改善粘结延性和强度。带肋玻璃钢条在玻璃钢约束混凝土中的粘结响应分为三个不同阶段：未开裂阶段、开裂增强阶段和开裂退化阶段。阐明了每个阶段的粘结机理。研究发现，归一化粘结强度受混凝土覆盖率与直径之比和 FRP 约束水平的明显影响，而混凝土强度的影响可以忽略不计。最后，该研究提出了一个新模型，用于预测嵌入非约束和 FRP 约束混凝土中的带肋 FRP 棒的粘结强度。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.