Flexural strengthening of reinforced concrete beams with pre-stressed near surface mounted CFRP systems

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• 作者：Hee Young Lee^a ; ^{heeyoung0908@khu.ac.kr} ; Woo Tai Jung^b ; ^{woody@kict.re.kr} ; Wonseok Chung^a ; ^{wschung@khu.ac.kr}
• 关键词：CFRP ; carbon-fiber-reinforced polymer ; FRP ; fiber-reinforced polymer ; NSM ; near-surface mounted ; RC ; reinforced concrete ; FEA ; finite element analysis
• 刊名：Composite Structures
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：163
• 期：Complete
• 页码：1-12
• 全文大小：4167 K
• 卷排序：163

文摘

This study investigated the effectiveness of strengthening reinforced concrete (RC) beams with pre-stressed near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) systems was investigated. Eight RC beams were tested under four-point loading tests. An un-strengthened control beam was used for reference. Four beams were strengthened with pre-tension NSM CFRP bars. The last three beams were strengthened with post-tension NSM CFRP bars. The test results showed that strengthening with a pre-stressed NSM beam enhanced the flexural behavior of the beam compared to that of the control beam. The post-tension NSM systems provided the best enhancement to beam performance for the concrete cracking, steel yielding, and ultimate loads. The test results of post-tension NSM beams were compared with the finite element analysis (FEA) model to validate the proposed model. The reinforcement length and pre-stressing force were used as parameters to analyze the effects of the strengthening performance in the proposed numerical model.