Shear capacity of reinforced concrete beams with recycled steel fibers

IF 1.5 Q2 ENGINEERING, MULTIDISCIPLINARY

Open Engineering Pub Date : 2023-01-01 DOI:10.1515/eng-2022-0457

Ali K. Muneam, Ragheed F. Makki

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引用次数: 0

Abstract

Abstract This study investigates the effect of using recycled steel fibers (RSFs) extracted from cut tires with dimensions of 0.8 and 40 mm in diameter and length, respectively. Different percentages of fibers were used, which are 0.5, 1, 1.5, and 2%. Ten beams with dimensions of 150 mm × 240 mm and a length of 1,700 mm were tested, two of which are control beams without stirrups and using stirrups at a distance higher than the upper limit ( d /2), which is a distance of 250 mm. In the case of using steel fibers without a stirrup, it is noticed that shear resistance increases gradually, but the type of failure remains shear. When using a minimum stirrup with steel fibers, the shear resistance increased significantly by 11.1, 23.7, 33.3, and 41.4%, respectively, compared to the reference beam without steel fibers so that the increased shear capacity in the presence of the minimum stirrups and optimal ratio of steel fibers of 2% reaches 122%, compared to the reference beam without stirrup and steel fibers, as well as converting the type of failure from shear failure to pure bending failure. When using a stirrup, this effect will be greater. The presence of RSF reduces deflection at cracking load, while increasing deflection at the ultimate load. Therefore, the stiffness and ductility ratio increased with the presence of steel fibers by 41.5 and 50.3%, respectively. Also, steel fibers delayed the appearance of beam cracks and reduced their widths.

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再生钢纤维钢筋混凝土梁抗剪承载力研究

摘要:本研究考察了直径为0.8 mm、长度为40 mm的切割轮胎中提取的再生钢纤维(rfs)的使用效果。纤维的添加比例分别为0.5、1、1.5、2%。测试了10根尺寸为150 mm × 240 mm、长度为1700 mm的梁，其中2根为不加马镫的控制梁和使用马镫的控制梁，距离高于上限(d /2)，即距离为250 mm。在使用钢纤维不加箍箍的情况下，可以注意到抗剪能力逐渐增加，但破坏类型仍然是剪切破坏。采用最小箍筋配钢纤维时，其抗剪能力较无钢纤维参考梁分别提高了11.1、23.7%、33.3%和41.4%，使最小箍筋配钢纤维最优比例为2%时的抗剪能力较无箍筋配钢纤维参考梁提高了122%，使破坏类型由剪切破坏转变为纯弯曲破坏。当使用马镫时，这种效果会更大。RSF的存在减少了开裂荷载下的挠度，而增加了极限荷载下的挠度。因此，加入钢纤维后，混凝土的刚度比提高了41.5%，延性比提高了50.3%。此外，钢纤维延缓了梁裂缝的出现并减小了裂缝的宽度。

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

Open Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

30 weeks

期刊介绍： Open Engineering publishes research results of wide interest in emerging interdisciplinary and traditional engineering fields, including: electrical and computer engineering, civil and environmental engineering, mechanical and aerospace engineering, material science and engineering. The journal is designed to facilitate the exchange of innovative and interdisciplinary ideas between researchers from different countries. Open Engineering is a peer-reviewed, English language journal. Researchers from non-English speaking regions are provided with free language correction by scientists who are native speakers. Additionally, each published article is widely promoted to researchers working in the same field.