Shear strengthening of fire-damaged reinforced concrete beams using NSM CFRP laminates

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2023-07-15 Epub Date: 2023-04-27 DOI:10.1016/j.engstruct.2023.116175

Leonardo Medeiros da Costa , Tiago Ancelmo de Carvalho Pires , José Jéferson Rêgo Silva

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Abstract

The aim of this study is to evaluate the shear strengthening of fire-damaged reinforced concrete (RC) beams with carbon fiber-reinforced polymer (CFRP) laminates using the near-surface mounted (NSM) technique. An experimental program involving 13 RC beams subjected to heating for 60, 90, and 120 min in accordance with the standard fire curve presented in International Organization Standardization (ISO) 834 is presented. After cooling to room temperature, the beams are strengthened with NSM CFRP laminates at spacings of 75, 150, and 200 mm. During heating, explosive spalling of concrete occurred in the samples. The NSM CFRP system can efficiently strengthen the shear of the beams; in most cases, it recovers the initial shear capacity of fire-damaged RC beams and increases it considerably. A smaller spacing between the laminates results in greater load capacities and stiffness, and a spacing of 75 mm causes the RC beams to fail owing to peeling-out in the strengthening region.

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NSM-CFRP层合板对火灾损伤钢筋混凝土梁的抗剪加固

本研究的目的是使用近表面安装（NSM）技术评估碳纤维增强聚合物（CFRP）层压板对火灾损伤钢筋混凝土（RC）梁的剪切加固。根据国际标准化组织（ISO）834提出的标准火灾曲线，对13根钢筋混凝土梁进行了60、90和120min的加热试验。冷却至室温后，梁用NSM CFRP层压板以75、150和200mm的间距进行加固。在加热过程中，样品中出现了混凝土的爆炸性剥落。NSM-CFRP体系能够有效地增强梁的抗剪性能；在大多数情况下，它恢复了火灾破坏的RC梁的初始抗剪承载力，并显著提高了其抗剪承载能力。层压板之间的较小间距导致更大的承载能力和刚度，75mm的间距导致RC梁由于在加强区域中剥落而失效。

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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.