Shear contribution of beams having different structural sizes strengthened in shear with anchored CFRP strips

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-11 DOI:10.1680/jmacr.23.00287

Xuan'ang Jiang, Liu Jin, Peng Qin, Maoxin Xia, X. Du

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Abstract

CFRP (Carbon Fiber Reinforced Plastics) debonding jeopardizes structural reinforcement in engineering projects. Anchoring CFRP paste is crucial for efficient shear strengthening. This study investigates the anchoring effect on shear resistance in nine CFRP U-wrapped concrete beams, varying shear span-to-depth ratios (1.0, 1.5, 2.0), and depths from 300 mm to 900 mm. Concurrently, nine unanchored beams and nine plain concrete beams were included in the comparison, considering the influence of beam depth and shear span ratio, referencing the prior research of Jiang et al. (2022). The evaluation of the shear contribution of CFRP with different sizes, particularly in scenarios involving large dimensions and diverse shear span ratios, was conducted. The test results revealed that the anchoring effect is most pronounced in small-scale beams with a large shear span ratio, demonstrating an improvement of over 60% compared to the CFRP shear-strengthened beam without anchoring. In contrast to beams without CFRP wrapping, the shear performance was enhanced by approximately 90%. Additionally, the study analyzed and compared the calculation formulas of shear capacity from different national specifications. Ultimately, a calculation method for CFRP shear resistance was established and its accuracy was verified.

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使用锚固 CFRP 带对不同结构尺寸的梁进行剪力加固的剪力贡献率

碳纤维增强塑料（CFRP）脱粘会危及工程项目中的结构加固。碳纤维增强塑料浆料的锚固对于高效剪切加固至关重要。本研究调查了锚固对九个碳纤维增强塑料 U 型包裹混凝土梁抗剪性能的影响，这些梁的剪切跨度与深度比（1.0、1.5、2.0）各不相同，深度从 300 毫米到 900 毫米不等。同时，参照 Jiang 等人（2022 年）的前期研究，考虑到梁深和剪跨比的影响，比较了 9 根无锚固梁和 9 根素混凝土梁。对不同尺寸的 CFRP 的剪力贡献进行了评估，尤其是在涉及大尺寸和不同剪跨比的情况下。试验结果表明，在剪跨比较大的小尺寸梁中，锚固效果最为明显，与无锚固的 CFRP 剪力加固梁相比，锚固效果提高了 60% 以上。与无 CFRP 包覆的梁相比，剪切性能提高了约 90%。此外，研究还分析和比较了不同国家规范中的抗剪能力计算公式。最终，建立了 CFRP 抗剪计算方法，并验证了其准确性。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.