Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading
Abstract
:1. Introduction
2. Design Philosophy
3. Experimental Program
3.1. Specimen Preparation
3.2. Material Properties
3.3. Test Setup
4. Results and Discussion
4.1. Failure Modes and Crack Patterns
4.2. Load Versus Deformation Responses
4.3. Strain Analysis
4.4. Ductility and Energy Dissipation
5. Conclusions
- The failure mode hybrid steel—FRP-reinforced concrete—ECC composite column was different from that of the hybrid steel—FRP-reinforced concrete column. Severe matrix spalling and local buckling of FRP bar were observed in the reinforced concrete column, but did not appear in the composite column. ECC can provide a more stable confinement on the GFRP bars than that of concrete.
- The anchoring scheme in the present study could present the bond-slip failure between GFRP bars and concrete effectively.
- With the substitution of ECC with concrete in the plastic hinge region, the load carrying capacity, ductility, and energy dissipation capacity of the hybrid steel—FRP-reinforced column increased by 39.62%, 73.44%, and 72.46%, respectively.
Author Contributions
Funding
Conflicts of Interest
References
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Matrix Designation | Cement | Fly Ash | Sand | Coarse Aggregate | Water | High-Range Water-Reducing Admixture, % | PVA Fiber Volume Fraction, % |
---|---|---|---|---|---|---|---|
ECC | 0.2 | 0.8 | 0.2 | --- | 0.22 | 0.8 | 2.0 |
Concrete | 1.0 | --- | 1.5 | 2.5 | 0.35 | 0.3 | --- |
Length (mm) | Diameter (µm) | Tensile Strength (MPa) | Elongation (%) | Elastic Modulus (GPa) | Density (g/cm3) |
---|---|---|---|---|---|
12 | 39 | 1620 | 7 | 42.8 | 1.3 |
Specimen ID | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Mean Value | Standard Deviation |
---|---|---|---|---|---|---|---|---|---|---|---|
Compressive strength of ECC (MPa) | 46.0 | 46.6 | 46.9 | 46.4 | 46.5 | 46.6 | 50.1 | 49.8 | 47.2 | 47.3 | 3% |
Compressive strength of concrete (MPa) | 37.4 | 36.8 | 36.4 | 34.9 | 36.7 | 35.2 | 35.4 | 36.9 | 32.7 | 35.8 | 3.82% |
Elastic modulus of GFRP bars (MPa) | 42 | 43.5 | 41.4 | -- | -- | -- | -- | -- | -- | -- | 2.01% |
Tensile strength of GFRP bars (MPa) | 746 | 749 | 761 | -- | -- | -- | -- | -- | -- | -- | 0.86% |
Diameter (mm) | Yield Strength fy (MPa) | Ultimate Strength fsu (MPa) | Elasticity Modulus es (GPa) |
---|---|---|---|
8 | 366 | 524 | 193 |
16 | 528 | 635 | 203 |
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Yuan, F.; Chen, L.; Chen, M.; Xu, K. Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading. Sensors 2018, 18, 4231. https://doi.org/10.3390/s18124231
Yuan F, Chen L, Chen M, Xu K. Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading. Sensors. 2018; 18(12):4231. https://doi.org/10.3390/s18124231
Chicago/Turabian StyleYuan, Fang, Liping Chen, Mengcheng Chen, and Kaicheng Xu. 2018. "Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading" Sensors 18, no. 12: 4231. https://doi.org/10.3390/s18124231
APA StyleYuan, F., Chen, L., Chen, M., & Xu, K. (2018). Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading. Sensors, 18(12), 4231. https://doi.org/10.3390/s18124231