Embedded through-section (ETS) technique for shear strengthening of reinforced concrete beams – Experimental and analytical study

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2025-03-22 DOI:10.1016/j.engstruct.2025.120038

Adriana S. Azevedo, João P. Firmo, João R. Correia, João Almeida

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引用次数: 0

Abstract

This paper presents an experimental and analytical study about the effectiveness of the embedded through-section (ETS) technique for shear strengthening of reinforced concrete (RC) beams. The influence of the following parameters on the structural efficacy of the ETS technique was assessed by testing full-scale RC beams in a three-point bending configuration up to failure: (i) the material of the ETS bars, ribbed steel bars and sand coated carbon fibre reinforced polymer (CFRP) bars, bonded to concrete with an epoxy-based adhesive; and (ii) the inclination of the ETS bars, 90° and 45° with respect to the beams longitudinal axis. The test results confirmed the efficacy of the ETS technique: compared to the reference (unstrengthened) RC beam, the shear strength increased 47 %, 58 % and 59 % using respectively steel bars at 90°, CFRP bars at 90° and CFRP bars at 45°. In the second part of the study, the failure loads of the ETS-strengthened RC beams were predicted using analytical formulations adapted from those proposed in different design codes and guidelines for conventional shear reinforcement or strengthening systems. Relatively accurate estimates were obtained with the formulae from ACI 440–2 R and Eurocode 2; yet, the most accurate predictions were obtained with the formulae from fib Model Code 2010 considering relatively low values of the compressive field inclination (23° < θ < 28°), which is consistent with the inclination values of the main shear cracks observed in the experimental tests.

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本文介绍了关于嵌入式截面（ETS）技术在钢筋混凝土（RC）梁抗剪加固中的有效性的实验和分析研究。通过测试全尺寸钢筋混凝土梁的三点弯曲配置直至破坏，评估了以下参数对 ETS 技术结构功效的影响：(i) 用环氧树脂基粘合剂粘合在混凝土上的 ETS 钢筋（带肋钢筋和涂砂碳纤维增强聚合物 (CFRP) 钢筋）的材料；(ii) ETS 钢筋与梁纵轴成 90° 和 45° 的倾斜度。试验结果证实了 ETS 技术的有效性：与参考梁（未加固）相比，使用 90° 的钢筋、90° 的 CFRP 钢筋和 45° 的 CFRP 钢筋，剪切强度分别提高了 47%、58% 和 59%。在研究的第二部分，使用分析公式预测了 ETS 加固 RC 梁的破坏荷载，这些公式是根据不同的设计规范和指南中针对传统剪力加固或加固系统提出的公式改编的。使用 ACI 440-2 R 和 Eurocode 2 的公式获得了相对准确的估计值；然而，使用 fib Model Code 2010 的公式获得了最准确的预测值，该公式考虑了相对较低的压场倾斜值（23° < θ < 28°），这与实验测试中观察到的主要剪切裂缝的倾斜值一致。

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

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.