Strengthening Techniques & Failure Modes of RC Beam Strengthened Using Fibre Reinforced Polymer. A Review

Abstract

strengthening of reinforced concrete (RC) beam
using Fibre Reinforced Polymer (FRP) revealed as the most
efficient material due to its various mechanical properties. The
previous experimental studies conducted to discuss
strengthening schemes for RC beam, based on the observed crack
pattern and failure mechanism for strengthening RC beam. The
development of crack formation on RC beams under loading
identifies the mode of failure and strengthening scheme required,
such as to increase the flexural capacity of RC beam; FRP is
applied at the tension zone. Similarly, for shear and torsion
strengthening FRP wraps are being applied at the faces of the
beam. The studies have shown the high strength in shear and
torsion is achieved by applying U-shape wrap. Full warp gives
high strength in torsion strengthening but practically the
application of full wrap on RC beam is impossible and required
more in-depth study to propose practical solutions. However, the
combined effects of flexure, shear and torsion have not been
discussed yet. Therefore, the strengthening schemes from
literature are combined to propose new strengthening scheme for
RC beam under combine the action of flexure, shear and torsion.
However, experimental data are required to validate the
proposed scheme.