Nonlinear analysis of reinforced concrete beams strengthened in shear with NSM FRP rods

Abstract EN

The present study includes using of near-surface mounted (NSM) fiber reinforced polymer (FRP) rods for increasing the shear strength of reinforced concrete beam.

Compares the effectiveness and efficiency of two strengthening techniques viz.

steel rebars as NSM reinforcement strips and CFRP strips as external reinforcement.

For this analysis, a system of computer program (ANSYS V.9.0) is used for this study.

The ordinary reinforced concrete was modeled by 8-noded isoparametric brick elements, while the steel reinforcing bars and NSM reinforcement were modeled as axial members (bar elements) connecting opposite nodes in the brick elements with full interaction assumption.

The CFRP strips were modeled by shell elements with full interaction assumption.

The results explain the shear capacity of the strengthened beams can be increased by either decreasing the spacing of the NSM rods, or anchoring the rods into the flange, or changing the inclination of the rods from vertical to 45 degrees.