Abstract
Based on the characterization of the bond between Fiber-Reinforced Polymer (FRP) bars and concrete, the structural behavior of cracked Glass-FRP (GFRP)-Reinforced Concrete (RC) tensile elements is studied in this paper. Simulations in which different bond-slip laws between both materials (FRP reinforcement and concrete) were used to analyze the effect of GFRP bar bond performance on the load transfer process and how it affects the load-mean strain curve, the distribution of reinforcement strain, the distribution of slip between reinforcement and concrete, and the tension stiffening effect. Additionally, a parametric study on the effect of materials (concrete grade, modulus of elasticity of the reinforcing bar, surface configuration, and reinforcement ratio) on the load-mean strain curve and the tension stiffening effect was also performed. Results from a previous experimental program, in combination with additional results obtained from Finite Element Analysis (FEA), were used to demonstrate the accuracy of the model to correctly predict the global (load-mean strain curve) and local (distribution of strains between cracks) structural behavior of the GFRP RC tensile elements.
Highlights
The use of Fiber-Reinforced Polymer (FRP) materials as an alternative to traditional steel reinforcement for Reinforced Concrete (RC) structures has been promoted in the last decades, especially in corrosive environments or when the effects of electromagnetic fields may be present
Different FRP products are available in the market, whose properties may have a significant effect on the structural performance of the RC element
The relatively low modulus of elasticity when compared with steel, especially for Glass Fiber-Reinforced Polymers (GFRP), leads to larger crack widths, and serviceability requirements often govern the design of FRP RC elements [1]
Summary
The use of Fiber-Reinforced Polymer (FRP) materials as an alternative to traditional steel reinforcement for Reinforced Concrete (RC) structures has been promoted in the last decades, especially in corrosive environments or when the effects of electromagnetic fields may be present. -mean strain curve In this paper, a comparative study about the effect of different GFRP bar types (with different bond performance) on the structural behavior of GFRP RC tensile elements is presented To this end, a numerical model for cracked elements based on bond stress-slip. Strain compatibility and equilibrium of considered: (1) the elastic behavior of the reinforcin forces at any section were imposed, which led to the well-known differential Equation (1), where n is the modular ratio (defined as the ratio between the modulus of elasticity of conditions and (2) strains, stresses, and displ embedded reinforcement, Er, and that of concrete, Ec), ρ is the reinforcement ratio (defined as the ratio between the cross-sectional area of reinforcement, Ar, and that of concrete, Ac), longitudinal direction of the composite element, a vary with the radial coordinate Along with these equilibrium of forces at any section were im Materials 2022, 15, 799 pr is the perimeter of the embedded reinforcement, and τ(x) and s(x) are two unknown functions, which are related through the bond-slip law. The tensile behavior of the member, in terms of load-member mean strain curve, was obtained and tension-stiffening effect could be derived
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