Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer
Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer
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DOI：
10.3390/app9152984
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Rui Guo;Lianheng Cai;S. Hino;Bo Wang
中科院分区：
文献类型：
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作者：
Rui Guo;Lianheng Cai;S. Hino;Bo Wang
本文研究了由碳纤维增强聚合物（CFRP）网格和聚合物水泥砂浆（PCM）相结合的加固层加固的多根钢筋混凝土（RC）梁的抗剪加固效果。共制备并研究了 10 根 RC 梁，其中包括 A 系列 3 种试件和 B 系列 7 种试件。这两个系列实验的测试变量包括不同的加固范围和不同的加固量，包括CFRP网格的间距和横截面积。试验结果表明，CFRP网格-PCM层对RC梁的抗剪强化效果明显且充分。同时，与仅腹板加固的 RC 梁相比，如果将 CFRP 网格-PCM 加固层用于 I 形截面 RC 梁的全截面加固，则可以观察到更好的性能。此外，还开发了一种基于CFRP网格有效应变的新评估方法，以确定CFRP网格-PCM层加固的RC梁的抗剪承载力。
This paper investigates the shear strengthening effect of a number of reinforced concrete (RC) beams strengthened by a reinforcement layer which combines carbon fiber reinforced polymer (CFRP) grid and polymer cement mortar (PCM). A total of ten RC beams, including three types of specimens as Series A and seven kinds of specimens as Series B, were prepared and investigated. The test variables in both series of experiments included various reinforcement ranges and different reinforcement amounts that consisted of CFRP grids’ spacing and cross-section areas. The experimental results suggest that the shear strengthening effect of the CFRP grid-PCM layer for RC beams is obvious and adequate. Meanwhile, better performance is observed if the CFRP grid-PCM reinforcement layer is used for the full sectional reinforcement of RC beams with an I-shaped profile, in contrast to RC beams with reinforcement of the web only. In addition, a new evaluation method based on the effective strain of the CFRP grid is developed to determine the shear capacity of RC beams strengthened by a CFRP grid-PCM layer.