This article presents the results of an experimental investigation of using carbon fiber–reinforced polymer sheets to enhance the behavior of reinforced concrete deep beams with large web openings in shear spans. A set of 18 specimens were fabricated and tested up to a failure to evaluate the structural performance in terms of cracking, deformation, and load-carrying capacity. All tested specimens were with 1500-mm length, 500-mm cross-sectional deep, and 150-mm wide. Parameters that studied were opening size, opening location, and the strengthening factor. Two deep beams were implemented as control specimens without opening and without strengthening. Eight deep beams were fabricated with openings but without strengthening, while the other eight deep beams were with openings in shear spans and with carbon fiber–reinforced polymer sheet strengthening around opening zones. The opening size was adopted to be 200 × 200 mm dimensions in eight deep beams, while it was considered to be 230 × 230 mm dimensions in the other eight specimens. In eight specimens the opening was located at the center of the shear span, while in the other eight beams the opening was attached to the interior edge of the shear span. Carbon fiber–reinforced polymer sheets were installed around openings to compensate for the cutout area of concrete. Results gained from the experimental test showed that the creation of openings in shear spans affect the load-carrying capacity, where the reduction of the failure load for specimens with the opening but without strengthening may attain 66% compared to deep beams without openings. On the other hand, the strengthening by carbon fiber–reinforced polymer sheets for beams with openings increased the failure load by 20%–47% compared with the identical deep beam without strengthening. A significant contribution of carbon fiber–reinforced polymer sheets in restricting the deformability of deep beams was observed.

中文翻译：

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使用碳纤维增强聚合物片材对具有大腹板开口的深梁进行强度补偿

本文介绍了使用碳纤维增强聚合物片材来增强在剪切跨度中具有大腹板开口的钢筋混凝土深梁性能的实验研究结果。制造并测试了一组 18 个试样，直到未能评估结构性能在开裂、变形和承载能力方面。所有测试样品的长度为 1500 毫米，横截面深为 500 毫米，宽度为 150 毫米。研究的参数是开口尺寸、开口位置和强化系数。两根深梁作为对照试件，没有开孔和加固。八根深梁制作有开口但没有加强，而其他八根深梁在剪切跨度中带有开口，并在开口区域周围采用碳纤维增强聚合物板加固。8根深梁的开口尺寸采用200×200 mm尺寸，其他8个试样采用230×230 mm尺寸。在八个试件中，开口位于剪切跨度的中心，而在其他八个梁中，开口连接到剪切跨度的内边缘。碳纤维增强聚合物板安装在开口周围，以补偿混凝土的切口区域。从实验测试中获得的结果表明，在剪切跨度中创建开口会影响承载能力，其中，与没有开口的深梁相比，有开口但没有加强的试件的破坏载荷减少了 66%。另一方面，与没有加强的相同深梁相比，用碳纤维增强聚合物板加固有孔梁的破坏载荷增加了20%–47%。观察到碳纤维增强聚合物片材在限制深梁变形能力方面的显着贡献。