Optimal Shear Strengthening of Severely Deficient RC Beam Using JFRP Laminate with Anchor

IF 1 Q4 ENGINEERING, CIVIL

Jordan Journal of Civil Engineering Pub Date : 2023-10-01 DOI:10.14525/jjce.v17i4.13

Md Ashraful Alam

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引用次数: 0

Abstract

High-strength jute fibre-reinforced polymer (JFRP) laminates have recently been introduced to strengthen RC beams against shear. In contrast to synthetic-based composites, JFRP laminates would be more ductile, compatible with steel shear rebar and effective in reducing debonding due to their lower modulus of elasticity. The prime objective of this research was providing an optimal solution to strengthen a severely deficient RC beam against shear using an externally bonded JFRP laminate with anchor. Fabrication of the JFRP laminate was carried out with the maximum fibre content of 37.5% to obtain high tensile strength. Five full-scale RC beam specimens were cast. Shear strengthening was done by an externally bonded JFRP laminate with double connector, multiple connector and embedded-bar anchor systems. The dimensions of JFRP laminate were obtained based on proposed guidelines. Based on the experimental test, the average tensile strength of the fabricated JFRP laminate was found to be 162 MPa. Results also showed that the JFRP laminate with multiconnector anchor increased the maximum shear capacity of deficient RC beams by 89% and the beams had failed by the fracture of laminate. Beams strengthened with embedded-bar anchor had shown flexural ductile failure. Both beams failed after yielding of flexural bar. The proposed guidelines could be used for shear strengthening of severely deficient beams to enhance the maximum shear capacity using full strength of JFRP laminate with anchor. KEYWORDS: RC beam, Shear strengthening, JFRP laminate, Anchor, Optimal design

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钢筋混凝土严重缺陷梁JFRP配筋优化抗剪加固

高强度黄麻纤维增强聚合物(JFRP)层压板最近被引入加强钢筋混凝土梁抗剪切。与合成基复合材料相比，JFRP层压板具有更强的韧性，与钢抗剪钢筋兼容，并且由于其较低的弹性模量而有效减少剥离。本研究的主要目的是提供一个最佳的解决方案，以加强严重缺陷的RC梁抗剪切使用外部粘结JFRP层压锚。为获得较高的抗拉强度，制备了纤维含量为37.5%的JFRP复合材料。浇铸了5个全尺寸RC梁试件。剪切加固采用双接头、多接头和预埋杆锚固体系的外粘结JFRP层合板。JFRP层压板的尺寸根据提出的准则得到。实验结果表明，复合材料的平均抗拉强度为162 MPa。结果还表明，JFRP复合材料复合锚杆可使钢筋混凝土缺陷梁的最大抗剪能力提高89%，梁因复合材料复合锚杆断裂而失效。预埋杆锚固加固梁出现了抗弯延性破坏。两梁在受弯杆屈服后均失效。建议的准则可用于严重缺陷梁的抗剪加固，以提高JFRP带锚层压板的最大抗剪能力。关键词:钢筋混凝土梁，抗剪加固，JFRP叠层，锚杆，优化设计

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来源期刊

Jordan Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

2.10

自引率

27.30%

发文量

期刊介绍： I am very pleased and honored to be appointed as an Editor-in-Chief of the Jordan Journal of Civil Engineering which enjoys an excellent reputation, both locally and internationally. Since development is the essence of life, I hope to continue developing this distinguished Journal, building on the effort of all the Editors-in-Chief and Editorial Board Members as well as Advisory Boards of the Journal since its establishment about a decade ago. I will do my best to focus on publishing high quality diverse articles and move forward in the indexing issue of the Journal.