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Structural behavior of corroded RC beams with/without stirrups repaired with CFRP sheets

机译：CFRP板修补有无箍筋的锈蚀RC梁的结构特性

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摘要

Strengthening/repair of existing reinforced concrete structures has become one of the important issues in the field of civil engineering. In reinforced concrete structures located in hot and humid areas, steel reinforcement is generally vulnerable to deterioration due to corrosion. Corrosion of reinforcement in many cases is considered the main cause of concrete structures deterioration which in turn requires large budgets for repair and maintenance. This paper presents the experimental results of damaged/repaired reinforced concrete beams. The experimental program consisted of testing 12 reinforced concrete rectangular beam specimens with/without shear reinforcement and exposed to accelerated corrosion. The corrosion level was varied between 5 and 7.5 % which represents mass loss of the longitudinal steel reinforcement on the tension side. Corroded beams without shear reinforcement were repaired by bonding longitudinal carbon fiber reinforced polymer (CFRP) sheets to the tension side in addition to external U-shaped CFRP sheets to restore the strength loss due to corrosion. Corroded beams with stirrups were repaired by bonding longitudinal CFRP sheets to the tension side only. The test results showed that using externally bonded U-shaped CFRP sheets restored the ductility of corroded beams without stirrups and prevented bond failure at the steel concrete interface due to the absence of internal stirrups. In addition, combining U-shaped and longitudinal CFRP sheets enhanced the ultimate load by 37 % and the stiffness by 25 % in corroded beams without stirrups. For corroded beams with stirrups ductile failure was observed. Corroded beams with stirrups strengthened with CFRP sustained higher failure loads; however, the stiffness was unchanged.
机译：现有钢筋混凝土结构的加固/修复已成为土木工程领域的重要问题之一。在炎热潮湿地区的钢筋混凝土结构中，钢筋通常容易因腐蚀而变质。在许多情况下，钢筋的腐蚀被认为是混凝土结构变质的主要原因，这反过来又需要大量的维修预算。本文介绍了受损/修复的钢筋混凝土梁的试验结果。实验程序包括测试12个钢筋混凝土矩形梁样本，该样本具有/不具有剪切增强特性，并受到加速腐蚀。腐蚀水平在5％到7.5％之间变化，这表示纵向钢加强件在受拉侧的质量损失。除外部U形CFRP板外，还通过将纵向碳纤维增强聚合物（CFRP）板粘合到受拉侧来修复没有剪切补强的腐蚀梁，以恢复由于腐蚀引起的强度损失。仅通过将纵向CFRP薄板粘合到张紧侧即可修复带有箍筋的锈蚀梁。测试结果表明，使用外部粘结的U形CFRP板可恢复无箍筋的腐蚀梁的延展性，并防止由于没有内部箍筋而导致钢混凝土界面粘结失败。此外，在没有箍筋的腐蚀梁中，将U形和纵向CFRP板结合使用可将极限载荷提高37％，并将刚度提高25％。对于带有箍筋的腐蚀梁，观察到了延性破坏。 CFRP加固的带箍筋的腐蚀梁承受更高的破坏载荷；但是，刚度没有变化。

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