Shear performance of continuous deep beams reinforced with steel, GFRP bars, stirrups, and novel grating systems: an experimental study

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Mohamed E. Shallan, Mostafa M. Khalil, Ahmed A. Mahmoud, Mosaad H. El-Diasity
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Abstract

This study presents a novel use of commercially manufactured glass fiber-reinforced polymer (GFRP) gratings as internal shear reinforcement in continuous reinforced concrete deep beams, a concept not previously applied in structural systems. The approach involves embedding prefabricated GFRP grating panels within concrete to enhance durability, corrosion resistance, and shear performance. An experimental program was conducted on six full-scale, two-span deep beams under monotonic loading. Specimens included beams reinforced with conventional steel bars and stirrups, GFRP longitudinal bars with steel stirrups, and hybrid systems combining GFRP bars with one to three layers of GFRP gratings. The evaluation focused on ultimate shear capacity, crack development, failure modes, maximum diagonal crack width, support reactions, and strain distribution. Beams with three grating layers achieved a 75.7% increase in shear strength over the reference, reduced diagonal crack width by 28%, and enhanced post-cracking toughness by 38%. Strain measurements confirmed effective engagement of the grating’s vertical ribs in resisting diagonal tension, with up to 199% strain increase after cracking. Comparisons with strut-and-tie models (ACI 318–19, CSA S806, and Eurocode 2) showed conservative strength predictions due to neglecting grating effects. A modified strut-and-tie model was developed to account for grating contributions, showing strong agreement with test results, with an overall average of 1.08. These findings provide preliminary evidence that GFRP gratings may be a durable and efficient alternative to steel stirrups in shear-critical concrete applications, warranting further investigation.

用钢、玻璃钢筋、马镫和新型格栅系统加固连续深梁的抗剪性能:一项实验研究
本研究提出了商业制造的玻璃纤维增强聚合物(GFRP)格栅作为连续钢筋混凝土深梁的内部剪切钢筋的新用途,这是以前未在结构系统中应用的概念。该方法包括在混凝土中嵌入预制玻璃钢格栅板,以提高耐久性、耐腐蚀性和抗剪性能。对6根全尺寸双跨深梁进行了单调加载试验。试验包括用常规钢筋和箍筋加固的梁,带箍筋的GFRP纵向筋,以及将GFRP筋与一至三层GFRP格栅组合在一起的混合系统。评估的重点是极限抗剪能力、裂缝发展、破坏模式、最大对角裂缝宽度、支撑反应和应变分布。具有三层光栅的梁的抗剪强度比参考梁提高了75.7%,对角裂缝宽度减少了28%,开裂后韧性提高了38%。应变测量证实了光栅的垂直肋在抵抗对角张力方面的有效接合,开裂后应变增加高达199%。与拉杆模型(ACI 318-19、CSA S806和Eurocode 2)比较,由于忽略光栅效应,显示出保守的强度预测。开发了一个改进的支柱和纽带模型来考虑光栅的贡献,显示出与测试结果的强烈一致性,总体平均为1.08。这些发现提供了初步的证据,表明玻璃钢格栅可能是一种耐用和有效的钢箍在剪切临界混凝土应用的替代品,值得进一步的研究。
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
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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