Design model for shear capacity of RC beams strengthened with two-side CFRP wraps based on effective FRP strain concept

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Design model for shear capacity of RC beams strengthened with two-side CFRP wraps based on effective FRP strain concept

Davood Mostofinejad, Amirhomayoon Tabatabaei Kashani & Ardalan
Hosseini

A simple design model based on effective strain of fibre-reinforced polymer (FRP) to
predict shear capacity of reinforced concrete (RC) beams strengthened with two-side
FRP wraps is proposed. Five two-side carbon FRP wrapped and five control
unstrengthened RC beam specimens were tested, and the obtained results in addition
to the experimental results of 32 two-side wrapped RC beams selected from the
literature were used to calibrate the model. Performance of the proposed model was
compared with fib Bulletin 14 and ACI 440.2R design models. It was shown that fib
Bulletin 14 and ACI 440.2R mostly overestimate the FRP contribution to the shear
capacity of two-side wrapped RC beams, while ACI 440.2R model is incapable of
predicting effective FRP strain for shear-strengthened shallow beams. Results of 20
independent tests on RC beams strengthened in shear with two-side wraps verified
that the proposed model fairly estimates the shear capacity of the strengthened RC
beams. It was justified and concluded that since the simple proposed model provides
more accurate and safe predictions compared with existing guideline models, it may
be capable to be used for design purposes.
Keywords: carbon fibre-reinforced polymer; reinforced concrete; shear strengthening;
debonding; analytical modelling; two-side wrap

 

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