Abstract
This paper investigates composite reinforcement with regard to its use as longitudinal reinforcement. The methods used to calculate the shear strength of concrete members reinforced with fibre-reinforced polymer (FRP) bars are analysed. The main parameters having a bearing on the shear strength of beams reinforced with composite bars are defined. A comparative analysis of the shear strength calculating algorithms provided in the available design recommendations concerning FRP reinforcement and formulas derived by others researchers is carried out. A synthesis of the research to date on sheared concrete members reinforced longitudinally with FRP bars is made. The results of the studies relating to shear strength are compared with the theoretical results yielded by the considered algorithms. A new approach for estimating the shear capacity of support zones reinforced longitudinally with FRP bars without shear reinforcement was proposed and verified. A satisfactory level of model fit was obtained—the best among the available proposals. Taking into account the extended base of destructive testing results, the estimation of the shear strength in accordance with the proposed model can be used as an accompanying (non-destructive) method for the empirical determination of shear resistance of longitudinally reinforced FRP bars.
Highlights
Steel-reinforced concrete members exposed to extremely adverse environmental conditions relatively quickly fail to meet the facility use requirements concerning durability and reliability [1,2,3,4].A structural member’s corrosion resistance can be increased by applying non-metallic glass fibre-reinforced polymer (GFRP), carbon-fibre-reinforced polymer (CFRP), basalt fibre-reinforced polymer (BFRP) or aramid fibre-reinforced polymer (AFRP) reinforcements to it [1].Fibre-reinforced polymer (FRP) bars are characterized by good mechanical and physical properties [1,2,5]
The design shear capacity of a structural member should be sufficient to ensure the transfer of interactions not weaker than the ones corresponding to the design
The available design recommendations concerning the shear strength of beams without shear reinforcement are verified on the basis of the experimental studies to date of support zones reinforced with FRP rebars
Summary
Steel-reinforced concrete members exposed to extremely adverse environmental conditions relatively quickly fail to meet the facility use requirements concerning durability and reliability [1,2,3,4]. Mainly owing to their corrosion resistance and electromagnetic neutrality, FRP rebars have found application as reinforcement for members in flexure [1]. In the case of both bending and shearing, the failure of beams reinforced with composite rebars is much more rapid than that of steel-RC beams [7]. It is important to design flexural members reinforced with composite rebars with regard to both bending and shearing. This paper presents composite bar reinforcement design recommendations from the available codes and formulas derived by other researchers. The available design recommendations concerning the shear strength of beams without shear reinforcement are verified on the basis of the experimental studies to date of support zones reinforced with FRP rebars. The paper presents a proposal for a new approach for estimating the shear capacity of support zones reinforced longitudinally with.
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