Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders
Abstract
:Featured Application
Abstract
1. Introduction
2. Materials and Methods
2.1. Finite Element Program
2.2. Finite Element Mesh
2.3. Material Models
2.4. Boundary Conditions
3. Results
3.1. The Stress–Strain Response
3.2. Effect of Slenderness
3.3. Effect of Number of Wraps
3.4. Localization and Hoop Strain Profiles
4. Discussion
4.1. Localization and Characteristic Length
4.2. Confinement Efficiency
4.3. Failure Mechanism and Proposed Rigid Block Model
5. Conclusions
- The stress–strain structural response curves capture the experimentally observed typical bi-linear behavior of the FRP-confined concrete. In the first part of the stress–strain curve, the behavior is linear similar to that of the unconfined concrete. The second part shows a pseudo-plastic linear behavior, depending mainly on the FRP wrap mechanical stiffness and the fracture mechanism developed inside the concrete.
- For a slenderness ratio H/D equal or greater than 2, the stress–strain responses of the cylinders coincide for the same level of confinement and fan up with increasing stiffness of the confining FRP. The response of the cylinders with H/D = 1 is affected by the additional confinement caused by the friction between the loading platens and the concrete cylinder.
- The proposed numerical model captures the strain localization inside the concrete core and reflects that in the development of variable hoop stresses in the confining FRP along the length of the cylinders. Hoop stress profiles allow the prediction of the location of the premature failure of the FRP when its maximum strain is reached as well as the calculation of the average strain or confinement level in the confined system.
Author Contributions
Funding
Conflicts of Interest
References
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Cylinder Size | Number of Wraps | Peak Axial Normalized Stress | Peak Axial Strain (%) | Average Hoop Strain (%) | Maximum Hoop Strain (%) | Hoop Strain Ratio |
---|---|---|---|---|---|---|
150 × 150 | 1 | 1.69 | 2.14 | 1.20 | 1.52 | 0.790 |
150 × 150 | 2 | 2.19 | 2.37 | 1.24 | 1.52 | 0.815 |
150 × 150 | 4 | 3.18 | 2.78 | 1.27 | 1.52 | 0.838 |
150 × 150 | 6 | 4.16 | 3.14 | 1.27 | 1.51 | 0.846 |
150 × 300 | 1 | 1.39 | 1.82 | 1.05 | 1.52 | 0.692 |
150 × 300 | 2 | 1.85 | 2.11 | 1.15 | 1.52 | 0.758 |
150 × 300 | 4 | 2.80 | 2.54 | 1.22 | 1.52 | 0.801 |
150 × 300 | 6 | 3.79 | 2.96 | 1.27 | 1.52 | 0.832 |
150 × 600 | 1 | 1.42 | 2.00 | 1.18 | 1.52 | 0.774 |
150 × 600 | 2 | 1.90 | 2.25 | 1.23 | 1.52 | 0.812 |
150 × 600 | 4 | 2.84 | 2.64 | 1.27 | 1.52 | 0.837 |
150 × 600 | 6 | 3.90 | 3.10 | 1.33 | 1.52 | 0.874 |
150 × 900 | 1 | 1.39 | 1.93 | 1.13 | 1.52 | 0.742 |
150 × 900 | 2 | 1.84 | 2.16 | 1.18 | 1.52 | 0.777 |
150 × 900 | 4 | 2.80 | 2.60 | 1.25 | 1.52 | 0.822 |
150 × 900 | 6 | 3.78 | 3.01 | 1.29 | 1.52 | 0.848 |
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Tabbara, M.; Karam, G. Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders. Appl. Sci. 2020, 10, 3432. https://doi.org/10.3390/app10103432
Tabbara M, Karam G. Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders. Applied Sciences. 2020; 10(10):3432. https://doi.org/10.3390/app10103432
Chicago/Turabian StyleTabbara, Mazen, and Gebran Karam. 2020. "Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders" Applied Sciences 10, no. 10: 3432. https://doi.org/10.3390/app10103432