Shear Behaviour of RC Beams Strengthened using CFRP Grid-ECC/PMM Matrix Composites: An Experimental and Numerical Investigation

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-01-07 DOI:10.3151/jact.22.1
Xu Yang, Jun-Qi Huang
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Abstract

In recent advancements, a novel strengthening approach employing engineered cementitious composites (ECC) and fibre-reinforced polymer (FRP) materials has emerged. This method integrates ECC as the matrix, carbon fibre-reinforced polymer (CFRP) grid as the internal strengthening component, and epoxy resin for bonding the overlay to the concrete substrate. This study conducted tests on four reinforced concrete (RC) beams under a four-point load configuration. One beam served as an un-strengthened control specimen, while three were subjected to different shear strengthening methods: polymer-modified mortar (PMM), ECC, and CFRP grid-reinforced ECC matrix composites layer (FGREM). The investigation covered failure modes, load-deformation relationships, and load-strain relationships. Finite element (FE) analysis was employed to reproduce the test results. Key findings include the ability of ECC as a matrix to substantially reduce concentrated interfacial bond stresses, preventing debonding failure. The FGREM-strengthened specimen exhibited a failure mode characterized by side concrete cover separation, resulting in a notable 124% enhancement in shear resistance. The proposed FE model, incorporating interfacial behaviour, accurately simulated the performance of all specimens.

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使用 CFRP 网格-ECC/PMM 矩阵复合材料加固的 RC 梁的剪切行为:实验与数值研究
最近,出现了一种采用工程水泥基复合材料(ECC)和纤维增强聚合物(FRP)材料的新型加固方法。这种方法将工程水泥基复合材料(ECC)作为基体,碳纤维增强聚合物(CFRP)网格作为内部增强部件,环氧树脂用于将覆盖层粘合到混凝土基体上。本研究在四点荷载配置下对四根钢筋混凝土(RC)梁进行了测试。其中一根梁作为未加固的对照试样,另外三根梁则采用了不同的剪切加固方法:聚合物改性砂浆(PMM)、ECC 和 CFRP 网格加固 ECC 矩阵复合材料层(FGREM)。调查内容包括失效模式、荷载-变形关系和荷载-应变关系。采用有限元(FE)分析来再现测试结果。主要发现包括 ECC 作为基体能够大幅降低集中的界面粘接应力,防止脱粘失效。经 FGREM 加固的试样表现出一种以侧混凝土覆盖层分离为特征的破坏模式,从而显著提高了 124% 的抗剪能力。所提出的包含界面行为的有限元模型准确地模拟了所有试样的性能。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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