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Shared CFRP activation anchoring method applied to NSMR strengthening of RC beams

机译：共享CFRP激活锚固方法应用于RC梁的NSMR加固

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摘要

The paper presents a novel strengthening system, which provide a shared carbon fiber reinforced polymer (CFRP) Near surface mounted reinforcement (NSMR) activation anchoring method. Nine T-section reinforced concrete (RC) beams were used in the testing scheme which contained both un-activated and activated strengthening configurations. The activated system applied a stress of 50% and 70% of the recommended ultimate capacity (2200 MPa) to a 8 mm CFRP rod. It was seen that, what seemed to be, the ultimate capacity of the CFRP rod (3300 MPa) was reached when using the activated anchoring method. A stable failure seemed to occur at this level with controlled cracking. The 50% activation provided IC-debonding as the ultimate failure mode, with an ultimate stress of approximately 3100 MPa. The shared activation method worked well, and no premature failures were experienced in the anchor system and adhesive interface between the CFRP NSMR system and the concrete substrate. A good correlation was found in the comparison of theory and test results, where following four stages were investigated: 1) initial strain of the activated NSMR CFRP bar, 2) transition zone between the un-cracked and linear elastic cracked state, 3) change from linear elastic cracked state to steel yielding and finally 4) failure.
机译：本文提出了一种新型的加固系统，该系统提供了一种共享的碳纤维增强聚合物（CFRP）近表面安装增强（NSMR）活化锚固方法。在测试方案中使用了九个T型截面钢筋混凝土（RC）梁，其中包含未激活和已激活的加固配置。激活的系统对8 mm CFRP杆施加了建议极限容量（2200 MPa）的50％和70％的应力。可以看出，当使用激活的锚固方法时，似乎达到了CFRP杆的极限承载力（3300 MPa）。在此水平下，似乎出现了稳定的破裂，并控制了破裂。 50％的激活提供了IC脱胶作为最终的失效模式，最终应力约为3100 MPa。共享的激活方法效果很好，并且在锚固系统和CFRP NSMR系统与混凝土基材之间的粘合剂界面上未发生过早的故障。在理论和测试结果的比较中发现了良好的相关性，其中研究了以下四个阶段：1）活化的NSMR CFRP筋的初始应变; 2）未破裂和线性弹性破裂状态之间的过渡区; 3）变化从线性弹性裂纹状态到钢屈服，最后是4）破坏。

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