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

机译：预应力近表面CFRP系统对钢筋混凝土梁的抗弯加固

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This study investigated the effectiveness of strengthening reinforced concrete (RC) beams with prestressed 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 prestressed 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. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本研究调查了采用预应力近表面安装（NSM）碳纤维增强聚合物（CFRP）系统加固钢筋混凝土（RC）梁的有效性。在四点载荷测试下测试了八个RC梁。使用未加强的控制光束作为参考。预应力NSM CFRP筋加固了四根梁。后三根梁用后张力NSM CFRP筋加固。测试结果表明，与控制梁相比，用预应力NSM梁进行加固可以增强梁的抗弯性能。后张力NSM系统为梁开裂，混凝土屈服和极限载荷提供了最佳的梁性能。将后张NSM梁的测试结果与有限元分析（FEA）模型进行比较，以验证所提出的模型。以钢筋长度和预应力为参数，分析了所提出数值模型中钢筋性能的影响。 （C）2016 Elsevier Ltd.保留所有权利。

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