Abstract
Reinforcement made of fibre-reinforced polymers (FRP) for concrete members is becoming increasingly important in structural engineering. Compared to conventional ribbed steel reinforcement bars, FRP reinforcement can be different in terms of modulus of elasticity, tensile strength and bond behaviour. This article presents and evaluates experimental investigations on the structural behaviour of concrete members under bending and shear loads. Different types of reinforcement (CFRP textile fabrics, CFRP bars, steel bars), cross-sections (slabs, beams) and types of failure (flexure, shear) are investigated. For a direct comparison with conventionally reinforced members, reference tests with steel reinforcement and comparable mechanical reinforcement ratio are carried out. The material properties and the structural behaviour of the studied concrete members are presented. The load-bearing, cracking and deformation behaviour is precisely described and the applicability of existing engineering models is checked. Additionally, the contributions to shear capacity are analysed using the deformation measurement based on digital image correlation.
Highlights
The majority of damages to existing reinforced concrete structures is caused by the corrosion of the reinforcement steel [1]
fibre-reinforced polymers (FRP) reinforcement typically has a lower modulus of elasticity, which reduces the longitudinal stiffness of the reinforcement and the height of the concrete compression zone leading to lower shear capacities [37]
In the presented experimental and theoretical investigations on the load-bearing and deformation behaviour of concrete members reinforced with carbon fibre-reinforced polymer reinforcement, the bending and shear capacity as well as the cracking behaviour are discussed
Summary
The majority of damages to existing reinforced concrete structures is caused by the corrosion of the reinforcement steel [1] To prevent these damages in future structures, alternative reinforcement materials, which are still subject of current research, have been developed and already used in practical applications. As part of the collaborative research project Carbon Concrete Composite [2], several tests were carried out on concrete members under flexural and shear loads. Based on the results of the experimental investigations, an overview of the essential aspects of the structural behaviour is given. This includes deflections, crack spacings, bending and shear capacity. The applicability of existing engineering models derived for steel reinforced concrete is checked and justified
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