Evaluating shear capacity in reinforced concrete deep beams with web openings strengthened using fiber-reinforced polymer and fiber-reinforced cementitious matrix

IF 2.1 4区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Structural Engineering Pub Date : 2024-07-23 DOI:10.1177/13694332241266539

Dang Dung Le, Xuan Huy Nguyen, Huy Cuong Nguyen, Cao Thanh Ngoc Tran

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引用次数: 0

Abstract

This research systematically compares the effectiveness of Carbon Fiber-Reinforced Polymer (FRP) and Fabric-Reinforced Cementitious Matrix (FRCM) in shear strengthening of reinforced concrete (RC) deep beams featuring web openings. Through a comprehensive experimental program, six RC beams were subjected to shear tests, considering variations in the number of layers for both FRCM and FRP, employing a U-wrapping configuration. Recorded parameters include load-deflection curves, ultimate strength, cracking patterns, failure modes, and strains in steel bars, allowing a comprehensive comparison between strengthened and un-strengthened RC beams. The study compares observed shear strengths from experiments with shear capacities predicted by proposed models for RC beams strengthened with FRCM and FRP, following codes such as ACI 440.2R-17, CSA S806-12, Eurocode 2, and ACI 549.4R-20. Increasing layers enhanced shear strengths and post-elastic stiffness. The presence of substantial openings led to early shear cracks and reduced strength. CFRP improved shear strength by 13.99% (1-layer) and 18.12% (2-layer), while FRCM strengthened layers by 20.2% (1 layer) and 29.3% (2 layers). FRCM outperformed in strength and stiffness, while FRP excelled in ductility and concrete confinement. Experimental and calculated results varied based on ACI, CSA, and Eurocode, with ACI providing consistent and accurate results. CSA’s calculation surpassed experiments, emphasizing its consideration of effective fabric design strain.

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评估使用纤维增强聚合物和纤维增强水泥基加固的带腹板开孔钢筋混凝土深梁的抗剪能力

本研究系统地比较了碳纤维增强聚合物（FRP）和织物增强水泥基质（FRCM）在具有腹板开口的钢筋混凝土（RC）深梁的剪切加固中的有效性。通过全面的实验计划，对六根钢筋混凝土梁进行了剪切试验，考虑了 FRCM 和 FRP 的层数变化，并采用了 U 型包裹配置。记录的参数包括荷载-挠度曲线、极限强度、开裂模式、破坏模式和钢筋应变，从而可以对加固和未加固的 RC 梁进行全面比较。该研究将实验观察到的剪切强度与根据 ACI 440.2R-17、CSA S806-12、Eurocode 2 和 ACI 549.4R-20 等规范对使用 FRCM 和 FRP 加固的 RC 梁所建议模型预测的剪切承载力进行了比较。增加层数可提高剪切强度和后弹性刚度。大量开口的存在会导致早期剪切裂缝并降低强度。CFRP 的剪切强度提高了 13.99%（1 层）和 18.12%（2 层），而 FRCM 的强度提高了 20.2%（1 层）和 29.3%（2 层）。FRCM 在强度和刚度方面表现优异，而 FRP 则在延展性和混凝土约束性方面表现突出。基于 ACI、CSA 和 Eurocode 的实验和计算结果各不相同，其中 ACI 提供了一致而准确的结果。CSA 的计算结果超过了实验结果，强调了其对有效织物设计应变的考虑。

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

Advances in Structural Engineering 工程技术-工程：土木

CiteScore

5.00

自引率

11.50%

发文量

230

审稿时长

2.3 months

期刊介绍： Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.