Finite-Element Analysis of Textile-Reinforced Mortar Strengthening of Shear-Deficient Reinforced Concrete Beams
Publication: Journal of Composites for Construction
Volume 26, Issue 4
Abstract
In this study, nonlinear finite-element analysis (FEA) will be employed to investigate textile-reinforced mortar (TRM) jackets for shear strengthened reinforced concrete (RC) beams. FEA models of TRM shear strengthened RC beams will be developed and validated against experimental study from the literature. Subsequently, a parametric study will be conducted on the validated FEA models to examine the effect of various beams’ depths, load distributions, and orientations and stacking sequences of the textile’s mesh layers. The results of the parametric study show that increasing the cross section depth improved the load capacity of the shear strengthened RC beams and reduced the shear contribution of TRM. In addition, the shear influence of TRM was more dominant when the beams were subjected to a uniformly distributed load. However, the strengthening the beams with one or three layers of textile mesh that had a 45° orientation was the most effective configuration to improve the shear capacity (VR). For stacking sequences, the improvement in the shear strength of all models compared with the control were between 68.6% and 77.4%, which indicated that the ply sequences had an insignificant impact on the RC beam’s VR.
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Data Availability Statement
All data, models, and codes generated or used during this study appear in the published article.
Notation
The following symbols are used in this paper:
- a
- shear span;
- bf
- FRP or TRM sheet’s width;
- bw
- beam’s width;
- Df
- stress distribution factor;
- d
- beam’s effective depth;
- Ec
- concrete modulus of elasticity;
- Ef
- fibers modulus of elasticity;
- Es
- steel modulus of elasticity;
- fc
- compressive stress of concrete;
- f ′c
- concrete compressive strength;
- ffdd
- TRM or FRP debonding stress design value;
- ffed
- TRM or FRP effective stress design value;
- ffu
- TRM or FRP jacket’s ultimate strength;
- fm
- mortar compressive strength;
- ft
- tensile strength of concrete;
- fy
- steel yield strength;
- G
- shear modulus;
- Gf
- critical fracture energy;
- hfe
- effective height of the TRM or FRP jackets;
- hw
- height of beam’s web;
- if
- spacing of TRM strip measured from center-to-center;
- kb
- covering/scale coefficient;
- Lb
- available bond length of TRM or FRP jackets;
- Le
- effective bond length of TRM or FRP jackets;
- Lmax
- maximum bond length of TRM or FRP jackets;
- n
- number of textile’s layers;
- tf
- nominal thickness of fibers of textile;
- Vf
- TRM shear contribution;
- VR
- beam’s shear capacity;
- wf
- TRM width;
- zb
- coordinate of the bottom end of the effective TRM or FRP jacket;
- zt
- coordinate of the top end of the effective TRM or FRP jacket;
- β
- angle between the fibers and the longitudinal axis of the beam;
- βL
- bond length factor;
- βt
- shear transfer coefficient;
- βw
- TRM sheet’s width coefficient;
- Ґfk
- specific fracture energy;
- ɛc
- concrete compressive strain;
- ɛeff
- effective strain;
- ɛfu
- ultimate tensile strain;
- η
- artificial damping coefficient;
- θ
- angle between the inclined cracks and beam’s longitudinal axis;
- λ
- modification factor;
- ρf
- composite material reinforcement ratio, which is equal to 2tf/bw;
- σdeb
- TRM debonding stress;
- σfe
- TRM effective stress;
- τmax
- maximum equivalent tangential contact stress; and
- φR
- local stress reduction factor.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 4 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 29, 2021
Accepted: Mar 25, 2022
Published online: Jun 8, 2022
Published in print: Aug 1, 2022
Discussion open until: Nov 8, 2022
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