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首页> 美国卫生研究院文献>Materials >Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates
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Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

机译：使用CFRP层压板剪切强化剪切强化沟槽环氧锚固系统的实验和分析研究

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摘要

Reinforced concrete (RC) beams strengthened in shear with carbon fiber reinforced polymer (CFRP) laminates as externally bonded reinforcement (EBR) usually fail due to debonding. This paper presents an experimental and analytical investigation on the use of groove-epoxy as an anchorage system for CFRP plates and sheets bonded on both sides of shear deficient RC beams. The aim of this study is to assess the effectiveness of using groove-epoxy in enhancing the shear capacity of RC beams. Nine rectangular RC beams were strengthened with CFRP plates and sheets with groove-epoxy anchorage systems of different groove widths and tested under four point bending. It is observed that the RC beams strengthened with the groove-epoxy anchorage system showed an increase in the shear-strength over the unstrengthened control beam up to 112 and 141% for plates and sheets, respectively. Also, the increase of shear-strength contribution of the groove-epoxy system to that of CFRP without grooves ranged between 30–190% for CFRP plates and between 40–100% for CFRP sheets. Generally, the contributions of groove-epoxy on shear-strength decreased with the increase of groove width. Moreover, shear strength prediction models, based on modifications of the ACI440.2R-17 shear model, were developed by incorporating groove factors as a modifier to the FRP shear-strength contribution. The developed models predicted the experimental shear-strength of the tested RC beams with a good level of accuracy, with an average mean absolute percent error (MAPE) = 3.31% and 6.68%, normalized mean square error (NMSE) = 0.072, 0.523, and coefficient of determination R2 = 0.964, 0.691, for plates and sheets, respectively.
机译：由于剥离，用碳纤维增强聚合物（CFRP）层压板的钢筋混凝土（RC）梁在剪切中加强了碳纤维增强聚合物（CFRP）层压板通常由于剥离而导致的抗粘合剂（EBR）。本文介绍了对CFRP板的锚固系统的使用和分析调查，用于CFRP板的锚固系统，以及粘合在剪切缺陷RC梁两侧的薄片。本研究的目的是评估使用沟槽环氧树脂在提高RC梁的剪切容量方面的有效性。用CFRP板和带有不同凹槽宽度的凹槽环氧树脂锚固系统的板材加强九个矩形RC梁，并在四点弯曲下进行测试。观察到与沟槽 - 环氧树脂锚固系统强化的RC光束分别在未加强的控制光束上的剪切强度增加到112和141％的剪切强度的增加。而且，CFRP板的沟槽环氧系统的剪切强度贡献与CFRP的CFRP的增加范围为30-190％，CFRP板的40-100％之间。通常，沟槽环氧树脂在沟槽宽度的增加随着凹槽宽度的增加而降低的贡献。此外，基于ACI440.2R-17剪切模型的修改，通过将沟槽因子作为改进剂来开发的剪切强度预测模型，以改变FRP剪切强度贡献。开发的模型预测了测试的RC光束的实验剪切强度，精度良好，平均值误差（MAPE）= 3.31％和6.68％，归一化均方误差（NMSE）= 0.072，0.523，和测定系数R2 = 0.964,0.691，适用于板和片材。

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