1. No category

DEVELOPMENT OF A COMPATIBILITY MODEL FOR TqE SHEAR
STRENGTHENING OF REINFORCED CONCRETE CONTINUOUS BEAMS
USING EXTERNALLY BONDED BI-DIIIECTIONAL CFRP STRIPS
KETUA PENYELIDIK:
PROF. Ir. DR. ABDUL AZIZ BIN DATO' ABDUL SAMAD
AHLI PEWl3LIDIK:
PM DR. J. JAYAPRAKASH
GERAN PEWELIDIKAN FUNDAMENTAL RESEARCH GRANT SCHEME
NO. VOT: 0708
UNIVERSITI TUN HUSSEIN OMV MGLAYSIA
ABSTRACT
The behaviour of reinforced concrete in shear is very complex and structure that fails in
shear was dangerous than flexural failure because shear failure usually occurs suddenly
and without any warning. It has been found out that many of existing reinforced
concrete structures are deficient is shear 'md needs to be repaired. Therefore, this study
tends to investigate the shear behaviour of reinforced concrete beams strengthened and
repaired using Carbon Fibre Reinforced Polymer (CFRP) composites. An experimental
work on ten reinforced concrete continuous beams has been conducted. The parameter
involved in this study was shear span to effective depth ratio, wrapping schemes and
CFRP strips orientation. All beams fails in shear as expected. Modes of failure for
beams wrapped at three sides of the beam were debonding and rupture of the CFRP
strips while beams wrapped at four sides of the beam fails in rupture of the CFRP strips.
The highest shear capacity enhancement was for beam wrapped at four sides of the beam
with 45"/135* orientation of the CFRP strips. From the experimental resuIts, it can be
concluded that wrapping schemes influences the shear capacity and diagonal crack angle
of the beam. It was also important to notice that for continuous beams, due to the
complexity of the high shear and bending moment region, the critical area (inner shear
span) of the high shear area should be strengthened more than the outer shear span of the
beam.
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