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Strengthening RC beams using externally bonded CFRP sheets with end self-locking

机译：使用末端自锁的外部粘结CFRP板加固RC梁

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摘要

When laminates of fiber reinforced polymer (FRP) are just bonded on the substrate of reinforced concrete (RC) members for strengthening, debonding failure often happens prematurely and suddenly on the FRP-concrete joints. It is unbeneficial to efficient employment of FRP and reliable service of the structures. This paper introduces a mixed anchoring technique for FRP sheets that combines external bonding (EB) and a novel type of end anchorage. FRP sheets are self-locked at ends by wrapping about a slotted plate in a specified way. Experiments on four concrete beams demonstrated that adding end self-locking to EB can effectively solve the serious problems of usual debonding. End debonding was simply prohibited and intermediate crack debonding was substantially restricted despite occurrence. As a result, not only ultimate strength but also failure ductility of the strengthened specimens was greatly enhanced. The final failure featured by either FRP rupture or concrete crush regardless of debonding degree. Finite element models are then established to simulate the responses of the strengthened beams with hybrid anchored FRP. The numerical results show good agreements with the test observations including debonding process and failure modes. It proves capability and accuracy of the modeling as a useful tool for further research.
机译：当将纤维增强聚合物（FRP）的层压板仅粘合在钢筋混凝土（RC）构件的基材上进行加固时，常常会过早发生脱胶失败，并且突然在FRP-混凝土接头上突然发生脱粘。有效使用玻璃钢和可靠的结构服务是不利的。本文介绍了一种结合了外部粘结（EB）和新型末端锚固的FRP板混合锚固技术。通过以指定的方式缠绕开槽的板，FRP板的末端可以自锁。在四个混凝土梁上进行的实验表明，在EB上增加端部自锁可以有效解决通常脱胶的严重问题。完全禁止端部剥离，尽管发生，中间裂纹的剥离也被严格限制。结果，不仅极大地提高了增强试样的极限强度，而且还大大提高了其破坏延性。最终的失败是由于FRP破裂或混凝土压碎而引起的，而与脱胶程度无关。然后建立有限元模型，以模拟混合锚固FRP加固梁的响应。数值结果表明与包括脱胶过程和破坏模式在内的测试结果吻合良好。它证明了建模的能力和准确性，是进一步研究的有用工具。

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