Study on the Impact Resistance of FRP Pasted onto a Blastproof Partition Wall under Out-of-Plane Repeated Impact Load
Abstract
:1. Introduction
2. Experimental Tests
2.1. Specimen Design
2.2. Material Properties
2.3. Pendulum Impact Device
3. Analysis of Pendulum Impact Test Results
3.1. Destruction Form
3.2. Impact Response Curve
3.3. Crack Morphology
3.4. Strain Time-History Curve
3.5. FRP Impact Resistance Contribution
4. Parametric Analysis
4.1. FRP Type
4.2. Number of FRP Layers
4.3. FRP Width
5. Comparison between Finite Element Simulation Results and Experiments
5.1. Finite Element Model
5.2. Damage Comparison
5.3. Comparison of Response Curves
6. Conclusions
- (1)
- Under the action of multiple pendulum impact loads, the blastproof partition wall without FRP was severely bent, the concrete fell off, and the steel bar was exposed. When the back of the wall was pasted with FRP, the lateral bending stiffness increased, and the peak impact force increased by 43.8%.
- (2)
- The tensile fracture strain value of FRP has a great influence on the resistance of the blastproof partition wall to multiple impact loads. FRP will elastically retract during the impact process. The impact recovery coefficient increased from 0.33 to 0.57, so the crack width of concrete decreased by 80.6%.
- (3)
- Large-rupture-strain FRP pasted onto the back of the blastproof partition wall is more capable of resisting multiple impact loads. Large-rupture-strain FRP can give full play to the advantages of a large tensile fracture strain, and the wall’s residual displacement is reduced by 59%. After multiple impacts, no fracture or peeling occurs, and the bonding performance with concrete is good.
- (4)
- The finite element simulation results show that the material model selected in this study can simulate the pendulum impact well. The failure mode of FRP pasted on the blastproof partition wall can be more accurately predicted, and this provides an effective method for predicting the impact damage in practical engineering.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specimen Number | FRP Parameters | ||
---|---|---|---|
Layers (n) | Width (mm) | Spacing (mm) | |
B0-0 | - | - | - |
BC1-100 | 1 | 100 | 100 |
BC2-100 | 2 | 100 | 100 |
BA2-100 | 2 | 100 | 100 |
BL1-100 | 1 | 100 | 100 |
BL1-50 | 1 | 50 | 100 |
Material Category | Density (kg/m3) | Tensile Strength (mpa) | Elastic Modulus (gpa) | Tensile Strain at Break (%) | Thickness (mm) |
---|---|---|---|---|---|
CFRP | 1500 | 3540 | 240 | 1.5 | 0.167 |
AFRP | 1440 | 2195 | 67 | 2.2 | 0.193 |
LRS-FRP | 1384 | 740 | 18 | 7 | 0.841 |
Tensile Strength (MPa) | Flexural Strength (MPa) | Tensile Shear Strength (MPa) | Compressive Elastic Strength (MPa) | Compressive Yield Strength (MPa) |
---|---|---|---|---|
35 | 42 | 14 | 1.5×103 | 76 |
Specimen Number | Impact Times | Maximum Impact Force (kN) | Maximum Mid-Span Displacement (mm) | Residual Displacement (mm) | Impact Recovery Factor (R) |
---|---|---|---|---|---|
B0-0 | 1 | 2289.2 | 40.4 | 26.9 | 0.33 |
2 | 2417.7 | 56.6 | 39.8 | 0.30 | |
BC1-100 | 1 | 2324.8 | 30.3 | 19.1 | 0.37 |
2 | 3035.8 | 60.8 | 42.9 | 0.29 | |
BC2-100 | 1 | 2249.4 | 28.6 | 17.5 | 0.39 |
2 | 3234.1 | 55.5 | 39.2 | 0.29 | |
BA2-100 | 1 | 2435.6 | 24.8 | 12.2 | 0.51 |
2 | 3337.1 | 49.3 | 32.4 | 0.34 | |
BL1-100 | 1 | 2498.1 | 30.4 | 14.4 | 0.53 |
2 | 2984.8 | 45.8 | 23.2 | 0.49 | |
BL1-50 | 1 | 2327.4 | 30.8 | 13.2 | 0.57 |
2 | 2870.1 | 46.2 | 31.2 | 0.32 |
Specimen number | S-1 | S-2 | S-3 | B-1 | B-2 | B-3 |
---|---|---|---|---|---|---|
B0-0 | ||||||
BC1-100 | ||||||
BC2-100 | ||||||
BA2-100 | ||||||
BL1-100 | ||||||
BL1-50 |
Material | Material Model | Material Parameters |
---|---|---|
Concrete | MAT_CSCM_CONCRETE | |
Tension steel | MAT_PLASTIC_KINEMATIC | |
FRP | MAT_ENHANCED_COMPOSITE _DAMAGE | Table 2 |
Pendulum | MAT_ELASTIC | |
Fixture device | MAT_RIGID |
Specimen Number | Peak Impact Force (kN) | Peak Mid-Span Horizontal Displacement (mm) | ||||
---|---|---|---|---|---|---|
Experimental | Simulation | Error | Experimental | Simulation | Error | |
B0-0 | 2289.2 | 2070.3 | 9.6% | 40.1 | 46.0 | 14.7% |
BC1-100 | 2324.8 | 2211.0 | 4.9% | 30.3 | 28.6 | 5.6% |
BC2-100 | 2249.4 | 2062.5 | 8.3% | 28.6 | 25.3 | 11.5% |
BA2-100 | 2435.6 | 2235.8 | 8.2% | 24.8 | 23.5 | 5.2% |
BL1-100 | 2498.1 | 2386.2 | 4.5% | 30.4 | 29.3 | 3.6% |
BL1-50 | 2327.4 | 2123.3 | 8.8% | 30.8 | 31.4 | 1.9% |
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Shi, C.; Zhang, J.; Liang, H.; Xu, H.; Liu, F.; Zhao, Y. Study on the Impact Resistance of FRP Pasted onto a Blastproof Partition Wall under Out-of-Plane Repeated Impact Load. Coatings 2022, 12, 1836. https://doi.org/10.3390/coatings12121836
Shi C, Zhang J, Liang H, Xu H, Liu F, Zhao Y. Study on the Impact Resistance of FRP Pasted onto a Blastproof Partition Wall under Out-of-Plane Repeated Impact Load. Coatings. 2022; 12(12):1836. https://doi.org/10.3390/coatings12121836
Chicago/Turabian StyleShi, Chenglong, Jigang Zhang, Haizhi Liang, Hongjian Xu, Feifei Liu, and Yang Zhao. 2022. "Study on the Impact Resistance of FRP Pasted onto a Blastproof Partition Wall under Out-of-Plane Repeated Impact Load" Coatings 12, no. 12: 1836. https://doi.org/10.3390/coatings12121836