Shear strengthening design of pre-cracked reinforced concrete beams using bonded and bolted steel plates

IF 0.9 Q4 ENGINEERING, CIVIL

Australian Journal of Structural Engineering Pub Date : 2022-12-12 DOI:10.1080/13287982.2022.2156167

M. Rakib, Abu Zakir Morshed

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引用次数: 0

Abstract

ABSTRACT A design guideline for shear strengthening of pre-cracked reinforced concrete (RC) beams using steel plates has been presented in this research by modifying the available shear capacity formulas. An experimental investigation was also carried out in order to validate the proposed guideline. Total five RC beams were fabricated, among which four beams were pre-cracked in shear by applying preloads. Two of the cracked beams were then strengthened with adhesive bonded steel plates while the rest two were strengthened with bolted steel plates. Variation was made in plate depth and bolt layers. The shear performance of the strengthened beams was evaluated by testing the beams to their ultimate capacity. Experimental results indicated that the shear capacity, ductility and stiffness of the pre-cracked beams increased significantly after strengthening with continuous steel plates. The shear capacity varied from 131% to 201% for strengthened beams compared to the control beam. Deeper plates offered better shear performance than the shallower plates. Modification of the existing formulas by introducing preload factors for estimating the shear capacity of the strengthened beams showed a good agreement with the experimental shear capacity.

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预裂钢筋混凝土梁用粘结和螺栓连接钢板的抗剪加固设计

摘要本文通过对现有抗剪承载力公式的修正，提出了一种预裂钢筋混凝土(RC)梁用钢板抗剪加固的设计准则。为了验证所提出的准则，还进行了实验调查。共制作了5根钢筋混凝土梁，其中4根梁通过施加预载荷进行了剪切预裂。其中两根开裂梁随后用粘接钢板加固，其余两根用螺栓钢板加固。钢板深度和螺栓层数发生了变化。通过测试梁的极限承载力，对加固梁的抗剪性能进行了评价。试验结果表明，连续钢板加固后，预裂梁的抗剪承载力、延性和刚度均有显著提高。与对照梁相比，加固梁的抗剪承载力在131% ~ 201%之间变化。较深的板比较浅的板具有更好的抗剪性能。通过引入预紧系数对已有的加固梁抗剪承载力计算公式进行了修正，与试验抗剪承载力计算结果吻合较好。

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

Australian Journal of Structural Engineering ENGINEERING, CIVIL-

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： The Australian Journal of Structural Engineering (AJSE) is published under the auspices of the Structural College Board of Engineers Australia. It fulfils part of the Board''s mission for Continuing Professional Development. The journal also offers a means for exchange and interaction of scientific and professional issues and technical developments. The journal is open to members and non-members of Engineers Australia. Original papers on research and development (Technical Papers) and professional matters and achievements (Professional Papers) in all areas relevant to the science, art and practice of structural engineering are considered for possible publication. All papers and technical notes are peer-reviewed. The fundamental criterion for acceptance for publication is the intellectual and professional value of the contribution. Occasionally, papers previously published in essentially the same form elsewhere may be considered for publication. In this case acknowledgement to prior publication must be included in a footnote on page one of the manuscript. These papers are peer-reviewed as new submissions. The length of acceptable contributions typically should not exceed 4,000 to 5,000 word equivalents. Longer manuscripts may be considered at the discretion of the Editor. Technical Notes typically should not exceed about 1,000 word equivalents. Discussions on a Paper or Note published in the AJSE are welcomed. Discussions must address significant matters related to the content of a Paper or Technical Note and may include supplementary and critical comments and questions regarding content.