https://orcid.org/0000-0001-6442-5401
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ABSTRACT
The shear behaviour of fibre-reinforced polymer reinforced concrete (FRP-RC) beams without web reinforcement suffers from low strength, low stiffness, more brittleness and wide and quick propagated cracks. Fortunately, the addition of various types of fibres could improve most of these weaknesses. On the other hand, the shear strength prediction of FRP-RC beams with various types of fibres is one of the most complex cases in structural engineering applications. Developing generalised, precise and consistent prediction models are necessary and very limited. This paper investigates the impacts of various types of fibres on shear strength and presents proposing four new prediction models, utilising artificial neural networks and empirical nonlinear regression analysis, and modifying the combination of available models based on a collected database of 49 shear test results of FRP-RC members with various types of fibres. The comparison of the developed models with the available equations from the literature indicates that the developed models yielded excellent performance, great efficiency and a high level of accuracy over all other existing models. Additionally, the parametric study confirmed that all the developed models have great abilities to accurately predict the actual response of each parameter, in spite of its complexity, on the shear strength of FRP-reinforced fibrous concrete beams without stirrups.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The data sets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
CRediT authorship contribution statement
Ghazi Bahroz Jumaa: Writing – original draft, Writing – review and editing.
Ghafur H. Ahmed: Methodology and modelling.
Nasih Habeeb Askandar: Writing – review and editing and data analysis
Notations
| a/d | = | Shear span to depth ratio |
| b | = | Beam width, mm |
| c | = | Depth of neutral axis |
| d | = | Effective depth, mm |
| Df | = | Diameter of fibre, mm |
| da | = | Maximum aggregate size |
| Ef | = | Modulus of elasticity of FRP reinforcement, MPa |
| ES | = | Modulus of elasticity of steel reinforcement, MPa |
| F | = | Fibre factor |
| fc’ | = | Cylindrical concrete compressive strength, MPa |
| kf | = | Fibre bond factor |
| Lf | = | Fibre length |
| Lf/Df | = | fibre aspect ratio |
| vb | = | fibre pull out strength, MPa |
| Vc | = | Shear strength due to concrete contribution in beams without stirrups, N |
| Vcf | = | Shear strength due to concrete and fibre contribution in beams without stirrups, N |
| Vf | = | Fibre volume fraction |
| xn | = | Any variable of the database |
| xn, normalised | = | Normalised variable |
| xmin | = | Minimum values of the data for the interested variable |
| xmax | = | Maximum values of the data for the interested variable |
| ρ | = | Flexural reinforcement ratio |
| λ | = | Reduction factor, 1 for normal weight concrete and 0.75 for light-weight concrete |
| τ | = | Bond strength |
| α | = | Diagonal crack inclination |