Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams

IF 1.7 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI:10.1515/jmbm-2022-0243

Noor Ayaad, N. Oukaili

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引用次数: 2

Abstract

Abstract The present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An experimental program was conducted on spandrel beams considering different key parameters including the cross-sectional aspect ratio (i.e., web height/web thickness), and the availability of the CFRP strengthening system. The ledge of the spandrel beams was exposed during testing to a very high eccentric load, which was transferred to the web of the spandrel beam causing high shear, torsion, and bending moments. Consequently, the applied load resulted in in-plane and out-of-plane deformations of the web accompanied by flexural and shear cracks. This article demonstrates the advantage of using CFRP sheets to strengthen the mentioned members. The applied CFRP sheets increased the failure torsional load by about 37% compared to the identical L-spandrels without strengthening. The outcomes indicate that using CFRP sheets show improvement in restricting the deflections and rotation of L-spandrels due to increasing spandrel stiffness. The reduction in the degree of rotation attained more than 33% in comparison to the spandrel beams without strengthening. The experimental program confirmed the applicability of the proposed strengthening technique for compacted and slender L-shaped spandrel-reinforced concrete beams.

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CFRP扭转加固技术对L型拱肩钢筋混凝土梁的加固效果

摘要本研究旨在通过实验更深入地了解碳纤维增强聚合物（CFRP）片材用于改善L形钢筋混凝土拱肩梁扭转性能的效率，其中梁的梁架在单调荷载下分两个阶段加载。考虑到不同的关键参数，包括横截面纵横比（即腹板高度/腹板厚度）和CFRP加固系统的可用性，对拱肩梁进行了试验程序。试验期间，拱肩梁的突出部分暴露在非常高的偏心荷载下，该荷载转移到拱肩梁腹板上，导致高剪切、扭转和弯矩。因此，施加的载荷导致腹板的平面内和平面外变形，并伴有弯曲和剪切裂纹。本文展示了使用碳纤维布加固上述构件的优点。与未加固的相同L形板相比，所施加的CFRP板的破坏扭转载荷增加了约37%。结果表明，由于拱肩刚度的增加，使用CFRP片材在限制L形拱肩的挠度和旋转方面有所改善。与未加固的拱肩梁相比，旋转度降低了33%以上。试验程序验证了所提出的加固技术对压实细长L形拱肩钢筋混凝土梁的适用性。

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

Journal of the Mechanical Behavior of Materials Materials Science-Materials Science (miscellaneous)

CiteScore

3.00

自引率

11.10%

发文量

审稿时长

30 weeks

期刊介绍： The journal focuses on the micromechanics and nanomechanics of materials, the relationship between structure and mechanical properties, material instabilities and fracture, as well as size effects and length/time scale transitions. Articles on cutting edge theory, simulations and experiments – used as tools for revealing novel material properties and designing new devices for structural, thermo-chemo-mechanical, and opto-electro-mechanical applications – are encouraged. Synthesis/processing and related traditional mechanics/materials science themes are not within the scope of JMBM. The Editorial Board also organizes topical issues on emerging areas by invitation. Topics Metals and Alloys Ceramics and Glasses Soils and Geomaterials Concrete and Cementitious Materials Polymers and Composites Wood and Paper Elastomers and Biomaterials Liquid Crystals and Suspensions Electromagnetic and Optoelectronic Materials High-energy Density Storage Materials Monument Restoration and Cultural Heritage Preservation Materials Nanomaterials Complex and Emerging Materials.