Journal of Science and Technology of Composites

Journal of Science and Technology of Composites

Experimental assessment of scaled-down FRP-retrofitted reinforced concrete beams under consecutive low-velocity impact loading using near surface mounted method

Document Type : Research Paper

Authors
AmirAli Hosseinnia
Mohammad Zaman Kabir
Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran.
10.22068/jstc.2024.2024091.1878
Abstract
In this research, experimental and numerical studies have been conducted to investigate the performance of concrete beams reinforced with FRP materials using the Near Surface Mounted (NSM) reinforcement method. In this method, the separation of FRP is delayed, and these materials are less exposed to adverse environmental conditions. In this study, after achieving a suitable mix design for concrete and performing dimensional analysis for scaling laboratory samples, six concrete beam samples were constructed. These six samples were divided into two groups, one subjected to low-velocity impact loading and the other to static bending loading. In each group, a control sample without reinforcement was considered. Additionally, two of the beams were reinforced using GFRP rebars, and the other two were reinforced with CFRP composite plates. According to the results, the beams reinforced with CFRP plates and GFRP rebars experienced an increase in flexural strength by 15.3% and 24.7%, respectively, compared to the control sample under static bending loading. Furthermore, the maximum displacement of these samples at the mid-span under impact loading decreased by 23.36% and 40%, respectively. Also, due to the increased stiffness of the FRP-reinforced samples, the acceleration at the center of the span in these beams significantly increased compared to the control sample. Based on this, it can be concluded that concrete beams reinforced with FRP materials using the NSM method show satisfactory performance under static and dynamic loading.
Keywords
Reinforced concrete beam
FRP composites
Near Surface Mounted method
Low-velocity impact loading

Subjects

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Journal of Science and Technology of Composites
Volume 11, Issue 1
Spring 2024
Pages 2401-2407