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Shear strengthening of RC beams with externally bonded UHPFRC laminates

机译：用外部粘合UHPFRC层压板剪切RC梁的剪切强化

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摘要

One of the most frequent and catastrophic problems encountered in reinforced concrete (RC) structures is failure due to shear deficiency in RC structures, especially in RC beams. Thus, in the scope of this experimental study, the effectiveness of using prefabricated ultra-high performance fiber-reinforced concrete (UHPFRC) laminates in the form of plate or strip for shear strengthening was investigated. The change in the plate thicknesses is the first variable of the test program studied herein. Besides, two different application methods were also tested to ensure which can be preferred for shear strengthening with UHPFRC plates; bonding with epoxy, and the use of anchorages. Moreover, as an innovative method, the application of UHPFRC in the form of strip was also investigated. Test results showed that by using UHPFRC laminate as a shear strengthening material; shear strength can be increased by 26% to 47%. Moreover, it is possible to convert behavior from catastrophic shear failure to flexural behavior with the help of UHPFRC laminates. It has been determined that the use of UHPFRC in the strip form helps to increase the load-bearing capacity the most, while the use of anchorage as the bonding method of plates improves the behavior markedly.
机译：钢筋混凝土（RC）结构中遇到的最常见且灾难性的问题之一是由于RC结构的剪切缺陷而导致的，特别是在RC梁中。因此，在该实验研究的范围内，研究了使用预制超高性能纤维钢筋混凝土（UHPFRC）层压板以剪切强化的形式的预制超高性能纤维增强混凝土（UHPFRC）层压的有效性。板厚度的变化是本文研究的测试程序的第一变量。此外，还测试了两种不同的应用方法，以确保与UHPFRC板剪切强化，可以优选剪切;与环氧树脂粘合，并使用锚固。此外，还作为一种创新方法，还研究了uhpfrc以条带形式的应用。测试结果表明，通过使用UHPFRC层压板作为剪切强化材料;剪切强度可以增加26％至47％。此外，可以在UHPFRC层压板的帮助下将行为从灾难性剪切失败转换到弯曲行为。已经确定，在条带形式中使用UHPFRC有助于提高承载能力，而锚定的使用作为板的粘接方法显着提高了行为。

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