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Strengthening of reinforced concrete deep beams having large square openings in shear zone with carbon fiber reinforced polymer (CFRP) wrap

机译：碳纤维增强聚合物（CFRP）包裹层加固在剪切区具有大方孔的钢筋混凝土深梁

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摘要

Typically, the reinforced concrete (RC) deep beam with large openings are facing some severe problems such as the interruption of natural load transfer by concrete struts acting in compression which can cause an intensive reduction in strength; and the clearly visible cracks in serviceability conditions. The CFRP has become an alternative solution to this issue and being extensively used as an external reinforcement to resolve the strength requirements in structural systems due to extremely strong yet light weight, outstanding fatigue properties, excellent corrosion resistance and easy yet efficient application on concrete. This experimental study is focuses on the investigation of the effect of CFRP wrap in strengthening RC deep beams with large square openings located in shear zone. Three approaches are under consideration; the first is the determination of natural load transfer in normal deep beam without opening, the second is the large square openings in deep beam without CFRP strengthening, and the third is the large square openings in deep beam with CFRP attached around the openings. A total of four RC deep beams which included a solid RC control beam, a deep beam with two large square openings, and two beams with two large square openings strengthened by using CFRP strips in different strengthening configurations, were tested to failure under four point loading to determine the relative structural behaviour such as ultimate load, failure mode, crack patterns, and load deflection behaviour. All RC deep beams were designed in a dimension of 120 x 600 mm and 2400 mm in length. The width and height of large square openings were in a dimension of 270 x 270 mm and located 300 mm from the edge of the deep beam. The loading point and support were located at 800 mm and 300 mm from the edge of the deep beam, respectively. RC deep beam with large square openings, US-BSO was significantly reduced the beam capacity by 61.76 % as compared to solid control beam, CB. However, the RC deep beam with large square openings strengthened by CFRP strips wrapped in U-shaped, SU-BSO has increases the beam capacity by 62.77 % compared to US-BSO. From the results obtained, it was found that the most effective CFRP strengthening method for RC deep beam with large square openings was U-shaped, which recovered the beam capacity up to 62.24 % as compared to solid control beam
机译：通常，具有大开口的钢筋混凝土（RC）深梁面临一些严重的问题，例如混凝土支柱在压缩作用下干扰自然载荷传递，从而可能导致强度大大降低。以及维修条件中清晰可见的裂缝。 CFRP已成为该问题的替代解决方案，并且由于其极强而又轻的重量，出色的疲劳性能，出色的耐腐蚀性以及易于在混凝土上有效地应用，因此被广泛用作解决结构系统中强度要求的外部增强材料。这项实验研究的重点是研究CFRP包裹层在钢筋混凝土深梁中的作用，该深梁具有较大的方形开口，位于剪切区。正在考虑三种方法；第一个是确定没有开孔的正常深梁的自然荷载传递，第二个是没有CFRP加固的深梁中的大方形孔，第三个是在孔周围附有CFRP的深梁中的大方形孔。在四点荷载下，共测试了四个RC深梁，其中包括实心RC控制梁，具有两个大方形开口的深梁和两个具有两个大方形开口的梁，这些梁通过使用CFRP筋在不同的加固构型下加固。确定相对结构行为，例如极限载荷，破坏模式，裂纹模式和载荷变形行为。所有RC深梁的设计尺寸均为120 x 600 mm，长度为2400 mm。大方形开口的宽度和高度的尺寸为270 x 270毫米，距离深光束的边缘300毫米。加载点和支撑分别位于距深梁边缘800 mm和300 mm处。与实心控制光束CB相比，具有大方孔的RC深光束US-BSO的光束容量显着降低了61.76％。但是，由U型包裹的CFRP条加固的具有大方形开口的RC深梁SU-BSO与US-BSO相比，梁的承载能力提高了62.77％。从获得的结果中发现，对于方形开口大的RC深梁，最有效的CFRP加固方法是U形，与实心控制梁相比，其梁容量可恢复到62.24％

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    Ng Kin Mun;

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