ABSTRACT

The durability and lifespan of concrete structures are significantly affected by the corrosion of steel reinforcement. Though epoxy-coated steel reinforcement is being used for practical applications, slight damage in the coating during the construction process is enough to initiate the corrosion process. The shortcomings in the current practices to prevent corrosion of steel reinforcement have led the researchers to look for alternatives. Innovative hybrid reinforcing elements with solid steel core and fibre-reinforced polymer (FRP) wrapping (called steel–FRP composite bars (SFCB)) can be considered as a suitable alternative to conventional steel reinforcement. In this research paper, experimental and numerical studies that investigated the flexural behaviour of concrete beam specimens reinforced with SFCB produced using glass fibres or carbon fibres are presented and discussed. Experimental study consisted of flexural testing of six concrete beam specimens with conventional steel reinforcement or SFCB with glass fibres or SFCB with carbon fibres. Two different spacings of shear stirrups were considered. Failure mode, first crack load, ultimate flexural load and load-deflection behaviour were recorded during the experiment. The test results showed that beam specimens with SFCB reinforced achieved less ultimate flexural load as compared to beam specimens with conventional steel reinforcement. The failure mode was found to be influenced by the spacing of the shear stirrups. The results of the numerical analysis were close to the experimental results. .

摘要

钢筋锈蚀严重影响混凝土结构的耐久性和寿命。虽然环氧涂层钢筋被用于实际应用，但在施工过程中涂层的轻微损坏足以引发腐蚀过程。当前防止钢筋腐蚀的做法的缺点促使研究人员寻找替代方案。具有实心钢芯和纤维增强聚合物 (FRP) 包裹的创新混合增强元件（称为钢-FRP 复合钢筋 (SFCB)）可被视为传统钢筋的合适替代品。在这篇研究论文中，介绍和讨论了实验和数值研究，这些研究调查了使用玻璃纤维或碳纤维生产的 SFCB 增强的混凝土梁试样的弯曲行为。实验研究包括六个混凝土梁试样的弯曲测试，这些试样采用传统钢筋或 SFCB 玻璃纤维或 SFCB 碳纤维。考虑了两种不同间距的剪切箍筋。在实验过程中记录破坏模式、初裂载荷、极限弯曲载荷和载荷-挠度行为。试验结果表明，与采用传统钢筋加固的梁试件相比，采用 SFCB 加固的梁试件获得的极限弯曲载荷更小。发现破坏模式受剪切箍筋间距的影响。数值分析结果与实验结果接近。.