Flexural Performance Analysis of Composite Beam with Reinforced HPFRCC Precast Shell
Highlights
- A HPFRCC prefabricated composite beam showed good flexural bearing performance
- Using the HPFRCC prefabricated shell increased the yield and peak loads of the composite beams.
- Using the HPFRCC prefabricated shell delayed the yielding point of the composite beams.
- A flexural bearing capacity calculation model of the composite beam was established.
Abstract
1. Introduction
2. Overview of the Experiment
2.1. Specimen Design
2.2. Material Properties
2.3. Test Setup and Measurement Content
3. Results and Analysis
3.1. Damage State and Crack Analysis
3.2. Load-Mid-Span Deflection Curve
3.3. Moment Curvature Curve Analysis
3.4. Plane Section Assumption
4. Load-Bearing Capacity Calculation Model
4.1. Assumption
4.2. Material Constitutive Relationship
4.2.1. Tensile-Compressive Principal Modeling of HPFRCC
4.2.2. Tensile-Compressive Principal Modeling of Concrete
4.2.3. Tension-Compression Intrinsic Modeling of Reinforcing Bars
4.3. Calculation of Ultimate Bearing Capacity
- Neutralization shaft in R/HPFRCC precast shell (height of pressurized zone xc ≥ 50 mm)
- Neutralization did not shift in R/HPFRCC precast shell (height of pressure zone xc ≤ 50 mm)
5. Comparison of Theoretical Calculations and Test Results
6. Conclusions
- Compared with the RC precast shell composite beam, the R/HPFRCC prefabricated shell monolithic composite beams presented good bending performance with microcracks and enhanced deformability. The R/HPFRCC composite beams presented excellent crack-developed control ability. The integrity, deformability, and damage resistance of the prefabricated monolithic composite beams could be increased by using HPFRCC material in the prefabricated shells.
- Compared to beam ZSTD1.11R, the peak and yield loads of R/HPFRCC composite beams were 17.2% and 24.6% higher. The bearing capacity of R/HPFRCC beam HPSTD1.21R was 10.3% higher than that of specimen RCSTD1.21R. With an increase of the factor ρl, R/HPFRCC composite beam yield and peak loads increased; yield and peak loads increased by 25.6% and 13.5%, respectively, when the longitudinal reinforcement ratio increased by 0.08%.
- Taking the strain-hardening properties of the HPFRCC material into account, the theoretical mechanical study of the bending load capacity of R/HPFRCC prefabricated monolithic composite beams was conducted. A calculating model of the bending capacity of R/HPFRCC composite beams was established. The calculated values of the model and the test values agreed well, with about 3.34% average error.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Specimen No. | Precast Shell | Load Direction | Shell Material | Longitudinal Reinforcement of Mold Shell | Upper Longitudinal Reinforcement of Beam | Lower Longitudinal Reinforcement of Beam | Longitudinal Rebar Rate/% | Hooped Tendon |
---|---|---|---|---|---|---|---|---|
HPSTD1.21R | Yes | Bottom in tension | HPFRCC | 4C10 | 2C16 | 3C12 | 1.21 | A6@70 |
HPSTD1.13R | Yes | Bottom in tension | HPFRCC | 4C10 | 2C16 | 2C14 | 1.13 | A6@70 |
HPSTD1.36R | Yes | Bottom in tension | HPFRCC | 4C10 | 2C16 | 2C16 | 1.36 | A6@70 |
HPSTD1.07R | Yes | Bottom in tension | HPFRCC | 4C8 | 2C16 | 3C12 | 1.07 | A6@70 |
HPSTD1.21R-W | Yes | Bottom in tension | HPFRCC | 4C10 | 2C16 | 3C12 | 1.21 | A6@70 |
HPREV1.46R | Yes | Top in tension | HPFRCC | 4C10 | 3C12 | 3C16 | 1.46 | A6@70 |
RCREV1.46R | Yes | Top in tension | RC | 4C10 | 3C12 | 3C16 | 1.46 | A6@70 |
RCSTD1.21R | Yes | Bottom in tension | RC | 4C10 | 2C16 | 3C12 | 1.21 | A6@70 |
ZSTD1.11R | No | Bottom in tension | - | - | 2C16 | 3C14 | 1.11 | A6@70 |
Type of Rebar | Rebar Diameter (mm) | Yield Strength fy (MPa) | Maximum Intensity fu (MPa) |
---|---|---|---|
HPB300 | 6 | 355 | 506 |
HRB400 | 8 | 410 | 512 |
10 | 425 | 626 | |
12 | 465 | 642 | |
14 | 442 | 614 | |
16 | 532 | 698 |
No. | Cracking Load /kN | Yield Load /kN | Yield Deflection /mm | 55 mm Peak Load at Mid-Span Displacement /kN |
---|---|---|---|---|
HPSTD1.21R | 18.0 | 219.2 | 11.30 | 256.6 |
HPSTD1.13R | 18.0 | 174.5 | 8.27 | 226.0 |
HPSTD1.36R | 12.0 | 233.4 | 13.14 | 267.6 |
HPSTD1.07R | 16.0 | 178.5 | 10.62 | 219.4 |
HPSTD1.21R-W | 17.6 | 208.3 | 10.56 | 249.4 |
HPREV1.46R | 18.0 | 239.8 | 14.34 | 295.6 |
RCREV1.46R | 18.0 | 217.0 | 9.14 | 276.4 |
RCSTD1.21R | 28.2 | 205.6 | 11.22 | 232.7 |
ZSTD1.11R | 30.0 | 176.0 | 9.95 | 219.0 |
Test Piece | Theoretical Ultimate Bending Moment/kN·m | Measured Ultimate Bending Moment/kN·m | Errors/% |
---|---|---|---|
HPSTD1.21R | 85.70 | 89.81 | 4.58 |
HPSTD1.13R | 80.43 | 79.10 | 1.68 |
HPSTD1.36R | 98.39 | 93.66 | 4.42 |
HPSTD1.07R | 76.02 | 76.79 | 0.99 |
HPSTD1.21R-W | 85.70 | 87.29 | 1.82 |
HPREV1.46R | 96.71 | 103.46 | 6.52 |
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Lu, T.; Wen, Y.; Guan, K.; Wang, B. Flexural Performance Analysis of Composite Beam with Reinforced HPFRCC Precast Shell. Materials 2025, 18, 762. https://doi.org/10.3390/ma18040762
Lu T, Wen Y, Guan K, Wang B. Flexural Performance Analysis of Composite Beam with Reinforced HPFRCC Precast Shell. Materials. 2025; 18(4):762. https://doi.org/10.3390/ma18040762
Chicago/Turabian StyleLu, Tingting, Yuxiang Wen, Kai Guan, and Bin Wang. 2025. "Flexural Performance Analysis of Composite Beam with Reinforced HPFRCC Precast Shell" Materials 18, no. 4: 762. https://doi.org/10.3390/ma18040762
APA StyleLu, T., Wen, Y., Guan, K., & Wang, B. (2025). Flexural Performance Analysis of Composite Beam with Reinforced HPFRCC Precast Shell. Materials, 18(4), 762. https://doi.org/10.3390/ma18040762