Flexural Performance of RC Beams Strengthened with Pre-Stressed Iron-Based Shape Memory Alloy (Fe-SMA) Bars: Numerical Study
Abstract
:1. Introduction
2. Background and Literature
3. Finite Element Simulation
3.1. Beam Geometry Used in Verification
3.2. Constitutive Model for Concrete in ABAQUS
3.3. Reinforcement Definition in ABAQUS
3.4. RC Beam Modeling in ABAQUS
3.4.1. Elements and Meshing
3.4.2. Pre-Stressing Modeling
4. Parametric Study
5. Results and Discussion
5.1. Verification Models
5.2. Parametric Study
5.2.1. Effect of Pre-Stressing Level
5.2.2. Effect of Changing Fe-SMA Rebar’s Diameter
5.2.3. Effect of Concrete Grade
5.2.4. Effect of Varying Strengthening Rebar Types
6. Conclusions
- Increasing either the pre-stressing level of Fe-SMA bars or the concrete grade enhanced the beam’s response at the serviceability stage but exhibited a minor effect at the ultimate stage. Specifically, increasing the concrete grade from 30 to 60 MPa produces a 15%, 4%, and 0.75% rise in the cracking, steel yielding, and ultimate loads, respectively, for the test specimens.
- Using a larger diameter of Fe-SMA bars improved the load-carrying capacity but reduced the ductility of test specimens. Specifically, using 12 mm Fe-SMA bars instead of 6 mm increased the beam’s strength by 73% and decreased the ductility by 14%.
- Strengthening RC beams with 2T22 mm of pre-stressed Fe-SMA bars yielded a better strength and ductility response than other commonly used techniques with 2T12 mm of carbon fiber reinforced polymer (CFRP) bars, glass fiber reinforced polymer (GFRP) bars, and steel strands. Moreover, considering the fabrication cost, the Fe-SMA rebars exhibited a comparable cost to other pre-stressing systems.
- Further experimental tests are required to further ascertain the reported findings of this numerical investigation. In particular, it is recommended to explore the use of the Fe-SMA bars as the main reinforcement in future research.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Dilation Angle | Eccentricity (e) | fb0/fc0 | K | Viscosity Parameter |
---|---|---|---|---|
55 | 0.1 | 1.16 | 0.67 | 0.0001 |
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Khalil, A.; Elkafrawy, M.; Abuzaid, W.; Hawileh, R.; AlHamaydeh, M. Flexural Performance of RC Beams Strengthened with Pre-Stressed Iron-Based Shape Memory Alloy (Fe-SMA) Bars: Numerical Study. Buildings 2022, 12, 2228. https://doi.org/10.3390/buildings12122228
Khalil A, Elkafrawy M, Abuzaid W, Hawileh R, AlHamaydeh M. Flexural Performance of RC Beams Strengthened with Pre-Stressed Iron-Based Shape Memory Alloy (Fe-SMA) Bars: Numerical Study. Buildings. 2022; 12(12):2228. https://doi.org/10.3390/buildings12122228
Chicago/Turabian StyleKhalil, Ahmed, Mohamed Elkafrawy, Wael Abuzaid, Rami Hawileh, and Mohammad AlHamaydeh. 2022. "Flexural Performance of RC Beams Strengthened with Pre-Stressed Iron-Based Shape Memory Alloy (Fe-SMA) Bars: Numerical Study" Buildings 12, no. 12: 2228. https://doi.org/10.3390/buildings12122228