Abstract
The wide usage of fiber-reinforced polymer (FRP) composites as an external shear strengthening material have resulted in the development of various design guidelines. However, the accuracy of the design guidelines is a matter of concern since the shear behavior of the RC beam becomes more complex with the addition of FRP composites. On the other side, soft computing methods have been proved to be efficient enough to analyze complex systems. However, their application in structural engineering is limited. Therefore, in the current investigation, an effort has been made to evaluate the shear contribution of the EB-FRP composites with the help of adaptive neuro-fuzzy inference system (ANFIS). A total of 151 sets of data assembled from literature was utilized for the development and evaluation of the ANFIS model. The ANFIS predictions were validated against the obtained experimental results as well as with the estimations of six widely implemented design guidelines. The comparative study has shown that the ANFIS estimates are in decent agreement with that of experimental outcomes and the accurateness of the current ANFIS model is superior to the considered design guidelines. Finally, a parametric investigation was performed to explore the combined effect of various parameters as well as the impact of independent parameters.
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Abbreviations
- A f :
-
Area of the FRP reinforcement and \({A}_{\mathrm{f}}=2n{t}_{\mathrm{f}}{w}_{\mathrm{f}}\)
- b w :
-
Width of the RC beam
- d :
-
Effective depth of RC T-beam
- d 0 :
-
Distance of extreme compression fiber from the centroid of the outermost layer of tensile reinforcements
- d f :
-
Effective depth of FRP
- d v :
-
Effective depth in the CSA guidelines, maximum of 0.9d or 0.72 × overall depth of RC beam
- E f :
-
Elastic modulus of FRP (MPa) (in GPa for fib)
- f fd /f fe :
-
Design strength/effective design strength of FRP
- f c :
-
Mean cylindrical compressive strength of concrete, as specified in the original article
- f ctm :
-
Mean tensile strength of concrete
- K EN :
-
Covering coefficient
- k v :
-
Bond-reduction coefficient
- k 1 :
-
Modification factor applied to kv to account for concrete strength
- k 2 :
-
Modification factor applied to kv to account for wrapping scheme
- L e :
-
Effective bond length
- n :
-
Number of FRP layers
- s f :
-
Center to center spacing of FRP strips
- p f :
-
Spacing of FRP strips, measured orthogonally to the fiber direction
- t f :
-
Thickness of FRP strip/sheet per layer
- w f :
-
Width of FRP strip/sheet
- z :
-
Internal lever arm
- α :
-
Angle in between principal fibers of FRP and the line perpendicular to the longitudinal axis of the member
- β :
-
Angle in between the longitudinal axis of the beam and principal fiber direction
- ε f,e /ε fu :
-
Effective/ultimate strain of FRP
- τ max :
-
Maximum bond strength
- θ :
-
Inclination of critical shear crack (assumed equal to 45°)
- ρ f :
-
FRP reinforcement ratio and \({\rho }_{\mathrm{f}}={A}_{\mathrm{f}}/b{s}_{\mathrm{f}}\)
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Kar, S., Pandit, A.R. & Biswal, K.C. A neuro-fuzzy approach to estimate the shear contribution of externally bonded FRP composites. Asian J Civ Eng 22, 351–367 (2021). https://doi.org/10.1007/s42107-020-00318-z
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DOI: https://doi.org/10.1007/s42107-020-00318-z