EXPERIMENTAL AND ANALYTICAL INVESTIGATION OF THE EFFECT OF FIBRE REINFORCED POLYMER ON THE SHEAR STRENGTH OF REINFORCED CONCRETE BEAMS

Nurudeen Yusuf,A Ocholi,M Abbas,A Mohammed,J M Kaura

doi:10.33003/fjs-2020-0403-257

Abstract

This paper presents the experimental and analytical results of the contribution of carbon fibre reinforced polymer (CFRP) laminates to the shear strength of RC beams. To assess the efficiency of the carbon fibre reinforced polymer (CFRP) laminates on the strengthened specimens, twelve identical beams of cross-sectional dimensions 150x150x750mm were cast, out of which three are un-strengthened and nine were strengthened with U-wrap strips at 100 mm away from each support at varying CFRP laminates layers of single, double and triple amounts. The prepared specimens were subjected to a three-point bending test. The results obtained revealed that the CFRP laminate increased the shear strength of the strengthened specimens over the control (un-strengthened) by 35.06%, 54.40% and 69.30% for single, double and triple layers of CFRP laminate respectively. The experimental results was also compared with the analytical results obtained based on the equation proposed by Khalifa et al., 1998. The analytical results obtained from the equation closely agreed with the experimental results. Therefore, it implies that the CFRP has the potentials of strengthening shear defiant RC beams.

Highlights

Many existing reinforced concrete elements are structurally deficient due to a variety of factors that includes poor design, change of use of structure from which it was initially designed for, poor construction method or quality and reduction in, or total loss of the area of the shear reinforcement due to corrosion all accounts for the reduction in strength for the affected RC members Module, (2004)
Several fiber reinforced polymers (FRP) shear strengthening schemes are available such as; carbon fibre reinforced polymer (CFRP) laminates bonded to the two sides of the beam, strips of CFRP bonded to the two faces at 450 or 900 to the horizontal beam axis or a Uwrap or jacket placed along the shear span”
The present research study focused on performing a comprehensive experimental and theoretical work to explore the efficiency of CFRP composites as external shear reinforcement in various amount

Summary

INTRODUCTION

Many existing reinforced concrete elements are structurally deficient due to a variety of factors that includes poor design, change of use of structure from which it was initially designed for, poor construction method or quality and reduction in, or total loss of the area of the shear reinforcement due to corrosion all accounts for the reduction in strength for the affected RC members Module, (2004). They referred to experiments proposed and experimental data and calculations, Maeda, (1997) was able to implemented by Maeda, (1997) which entailed CFRP strips formulate an equation based on the bond mechanisms of the connected to a concrete structure under tensile loading. A number of steps are required to experiments were designed to show the relationship between obtain the equation and are based on the CFRP configuration, the bonded length and the ultimate tensile strength of the CFRP concrete strength, and load capacity of the CFRP sheet, strip.

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CONCLUSION