H.H.N.D. Haggalla, Sang-Wook Bae

Abstract: Based on a data fitting method applied to 490 experimental test data that are publicly available in the literature, this study provides simplistic and straightforward equations to determine the shear capacity of FRP bonded-RC beams. Complete wrap, U-wrap, and side wrap schemes pertaining to Carbon Fiber Reinforced Polymer (CFRP) were analysed separately. Current design codes follow a customary approach where the nominal shear capacity is calculated by simply accumulating the shear contribution of concrete, transverse reinforcement, and FRP. The interaction between concrete, transverse reinforcement, and FRP is usually not taken into consideration. While the modulus of elasticity of FRP, transverse steel ratio, and FRP ratio all have an inverse interaction with the effective strain of FRP, the concrete compressive strength, longitudinal steel ratio, and the shear span-to-depth ratio are positively linked with the effective FRP strain. This investigation further showed that as transverse reinforcement is increased, the influence of FRP on shear contribution significantly decreases in the complete wrap scheme. ACI 440.2R-17, CSA S806-02 and its latest version CSA S806-12 are among the regularly used shear design codes in North America and they were used to compare the performance of the proposed equations. The obtained results show that the proposed equations predict the experimental results more accurately than ACI 440.2R-17, CSA S806-02, and CSA S806-12.

Keywords: Data fitting; Fiber reinforced polymers; Shear strength; RC beams; Curve fitting; Repair; Strengthening.

Date Published: July 2, 2024
DOI: 10.11159/ijci.2024.007

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