Tests And Analysis Of Reinforced Concrete Beams
Under Torsion Retrofitted With FRP Strips
Author(s)
C. E. Chalioris
Abstract
The aim of the present study is twofold. First, the results of an experimental
investigation on the torsional response of reinforced concrete (RC) beams
retrofitted with epoxy-bonded carbon fibre-reinforced-polymer (FRP) strips as
external transverse reinforcement are presented. Second, an analytical approach
for the estimation of the torsional capacity and the entire behaviour of RC beams
retrofitted with FRP fabrics is attempted. The experimental program comprises
eight beams with a rectangular cross-section tested under pure torsion. Based on
the measured values of the torsional moment at cracking and at ultimate and the
behavioural curves of the beams, useful conclusions concerning the effectiveness
of the FRP strengthening technique are indicated. Further, in order to describe
the entire torsional behaviour of RC beams retrofitted with FRP, a method that
employs the combination of two different analytical theories is used. The
prediction of the elastic till the first cracking part is achieved using a smeared
crack analysis for plain concrete in torsion, whereas for the description of the
post-cracking response a modified softened truss model is proposed. The wellknown
softened truss model is properly modified to include the influence of the
FRP fabrics on the torsional response as external reinforcement. Analytical
torsional behaviour curves are compared with experimental ones from the
present study and the literature, and first concluding remarks are mentioned.
Keywords: beams, reinforced concrete, fibre-reinforced polymers (FRP),
retrofit, model, torsion, tests.
Keywords
beams, reinforced concrete, fibre-reinforced polymers (FRP),
retrofit, model, torsion, tests.
Related Book
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