Abstract
The replacement of conventional steel bars with GFRP or CFRP is one of the main topics discussed in this paper, including the main parameters and properties of the materials. The design procedures should account for the properties and will focus on the tensile strength and modulus of elasticity. It will also consider corrosion under environmentally aggressive conditions. This paper presents an experiment on the flexural behavior of concrete beams reinforced with GFRP and CFRP bars and compares these results with theoretical analysis based on different standards such as ACI, Eurocode, and CSA. Twelve reinforced concrete beams will be tested using four-point loading. The geometrical parameters of the tested beams are 130×220×2200 mm, reinforced with different diameters for GFRP and CFRP. The reinforcement ratio and strength of concrete influence the behavior of GFRP, CFRP, and RC beams and contribute to reduce the deflection and crack width. Based on this research, the closest approximation of the experimental results is observed with ACI standards. At this stage, these bars can be used in structures without strict requirements for exceeding the Serviceability Limit State. The non-integration of tension stiffening and regression performance of cracking moment in prediction expressions imposed the differences from experimental results.
Highlights
For a long time, researchers and civil engineers have been searching for alternatives to steels and alloys to reduce the high costs of repair and maintenance of structures damaged by corrosion
The mechanical properties of the tested GFRP and CFRP bars are presented in Table 1 while the properties of conventional steel bars were used from known parameters based on previous research [3]
GFRP-reinforced bars are characterized by deep cracks that occur rapidly in the direction of the force lines, a phenomenon not emphasized at this level in reinforced concrete slabs with conventional steel bars
Summary
Researchers and civil engineers have been searching for alternatives to steels and alloys to reduce the high costs of repair and maintenance of structures damaged by corrosion. The behavior of FRP bars under environmentally aggressive conditions, their light weight, non-magnetic characteristics, and mechanical properties such are tensile strength, are beneficial parameters for the replacement of conventional steel in elements of structures. Use of these materials is limited because the modulus of elasticity, ductility, large creeps, bond between the FRP bars and concrete and high cost can disorient other parameters [1]. According to ACI 440.1R-06, the design of FRP-reinforced concrete members is governed by serviceability limit state (SLS) requirements This is because the modulus of elasticity of FRP bars is much lower than steel bars and, affects the deformation response of FRPreinforced beams. This investigation includes beams reinforced with conventional steel as the referent model for better comparative effects
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