Experimental Investigation on Flexural Behavior of RC Beams Strengthened by NSM CFRP Reinforcements

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI:10.14359/14867

W. Jung, Y.H. Park, J. Park, J. Kang, Y. You

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引用次数: 52

Abstract

Synopsis: This study presents the results of experiments performed on RC (Reinforced Concrete) beams strengthened with NSM(Near Surface Mounted) reinforcement. A total of 8 specimens have been tested. The specimens can be classified into EBR(Externally Bonded Reinforcement) specimens and NSM(Near Surface Mounted) reinforcements specimens. Two of NSM specimens were strengthened with 12 mechanical interlocking grooves with a width of 20 mm and spacing of 200 mm in order to prevent debonding failure of the CFRP(Carbon Fiber Reinforced Polymer) reinforcement. Experimental results revealed that NSM specimens used CFRP reinforcements more efficiently than the EBR specimens, but debonding failure between adhesive and concrete occurred. This showed that, similarly to EBR specimens, NSM specimens also required countermeasures against debonding failure. Failure mode of NSM specimens added with mechanical interlocking grooves failed by rupture of CFRP rod and strip. The measured ultimate load showed an increase of 15% compared with the common NSM specimens. The application of mechanical interlocking grooves made it possible to avoid debonding failure and to enhance strengthening performance.

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NSM CFRP加固RC梁受弯性能试验研究

摘要:本研究介绍了用NSM(近表面安装)加固RC(钢筋混凝土)梁的实验结果。共检测了8个标本。试件可分为外粘接加固(EBR)试件和近表面加固(NSM)试件。为了防止CFRP(Carbon Fiber Reinforced Polymer，碳纤维增强聚合物)的脱粘破坏，在2个NSM试件上设置了12个机械互锁槽，槽宽为20 mm，间距为200 mm。试验结果表明，NSM试件对CFRP加固的利用效率高于EBR试件，但粘结剂与混凝土之间存在脱粘破坏。这表明，与EBR样品类似，NSM样品也需要采取措施防止脱粘破坏。添加机械联锁槽的NSM试件因CFRP棒、条断裂而失效模式实测极限荷载较普通NSM试件提高了15%。机械联锁槽的应用，避免了脱粘失效，提高了强化性能。

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SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures

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