Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams
Abstract
:1. Introduction
2. Experimental Program
2.1. Test Specimens
2.2. Materials Properties
2.3. Testing Procedure
- a test frame where the mechanical actuator is fixed;
- a device that receives the load from the mechanical actuator and applies a torsional moment in one end of the test beams;
- a device that fixes the test beam at the other end, restricting its transversal rotation (twist) and allowing its longitudinal deformation (elongation).
3. Global Analysis of the Experimental Results
3.1. Torsional Moments vs. Twists
3.2. Force in the Prestress Reinforcement vs. Twists
4. Failure Modes and Cracking Patterns
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Beam. | cm | cm | cm | cm2 | cm2 | cm2 | cm | % | % | % | MPa | MPa | GPa | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
D-0 | 10.9 | 53.5 | 53.7 | 23.75 | 0.79 | 0 | 7.0 | 0.66 | 0.67 | 1.33 | 0.99 | 77.8 | 4.33 | 40.7 |
D-1.79 | 11.4 | 54.3 | 54.2 | 23.75 | 0.79 | 5.60 | 7.0 | 0.66 | 0.68 | 1.34 | 0.97 | 80.8 | 4.43 | 41.1 |
D-3.08 | 11.5 | 55.0 | 54.6 | 23.75 | 0.79 | 5.60 | 7.0 | 0.66 | 0.68 | 1.34 | 0.96 | 78.8 | 3.66 | 37.4 |
Components | Dosage |
---|---|
Thin sand | 164 kg |
Thick sand | 908 kg |
Crushed Granit 5–11 mm | 734 kg |
Normal Portland Cement (C): Type I/42.5R | 375 kg |
Admixture—Rheobuild 1000 | |
Silica Fume (Sikacrete HD) | 41 kg |
Water (A) | |
A/(C + Additions) | 0.35 |
Beam | kNm | °/m | kNm2 | kNm2 | kNm | °/m | kNm | °/m | |
---|---|---|---|---|---|---|---|---|---|
D-0 | 130.5 | 0.04 | 172,940 | a = 170.87; b = 119.43 | 9790 | - | - | 355.9 | 1.45 |
D-1.79 | 172.9 | 0.07 | 152,188 | a = 194.73; b = 142.95 | 11,157 | 314.9 | 0.87 | 396.0 | 1.38 |
D-3.08 | 184.7 | 0.08 | 141,823 | a = 148.05; b = 132.34 | 14,212 | 430.0 | 1.34 | 447.7 | 1.57 |
Beam | cm | ° |
---|---|---|
D-0 | 13.0 | 46.3 |
D-1.79 | 12.9 | 44.8 |
D-3.08 | 13.6 | 44.2 |
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Bernardo, L.; Lopes, S.; Teixeira, M. Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams. Appl. Sci. 2020, 10, 642. https://doi.org/10.3390/app10020642
Bernardo L, Lopes S, Teixeira M. Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams. Applied Sciences. 2020; 10(2):642. https://doi.org/10.3390/app10020642
Chicago/Turabian StyleBernardo, Luís, Sérgio Lopes, and Mafalda Teixeira. 2020. "Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams" Applied Sciences 10, no. 2: 642. https://doi.org/10.3390/app10020642
APA StyleBernardo, L., Lopes, S., & Teixeira, M. (2020). Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams. Applied Sciences, 10(2), 642. https://doi.org/10.3390/app10020642