Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology
Abstract
:1. Introduction
2. Methods and Models
2.1. Methods
2.2. Concrete Material Model
2.2.1. Tensile and Compressive Constitutive Relation of Concrete
2.2.2. Damage Factor
2.2.3. Dynamic Amplification Factor
2.3. Establishment of the Slab Model
2.4. The Material Model of Steel
2.5. Establishment of the Reinforcement Model
2.6. Equivalence of Impact Loads
2.6.1. CONWEP Model
2.6.2. Equivalence of Shock Pressure
2.7. Simulation of Concrete Crack Propagation Based on Cohesive Force Model
3. Model Verification
3.1. Model Test
3.2. Comparison between Experimental Results and Simulation Results
4. Results
4.1. Analysis of the Whole Process of Reinforced Concrete Slab Loading
4.2. Influence of Reinforcement Diameter on Cracks of Reinforced Concrete Slab
4.2.1. Influence of Reinforcement Diameter on Edge Crack Width w1
4.2.2. Influence of Reinforcement Diameter on Crack Width w2 between Edge Holes
4.2.3. Influence of Reinforcement Diameter on Crack Width w3 between Internal Holes
4.3. Influence of Reinforcement Spacing on Cracks of Reinforced Concrete Slab
4.3.1. Influence of Reinforcement Spacing on Edge Crack Width w1
4.3.2. Influence of Reinforcement Spacing on Crack Width w2 between Edge Holes
4.3.3. Influence of Reinforcement Spacing on Crack Width w3 between Internal Holes
4.4. Influence of Reinforcement Spacing on Cracks of Reinforced Concrete Slab
5. Discussion
6. Conclusions
- (1)
- The CONWEP method was used to simulate the impact load produced by PPD and the cohesive force model was used to simulate the development of cracks. By comparing the results of the PPD crushing test and simulation analysis, the relative errors of the test value and simulation analysis value of crack width were less than 10%. It shows that the finite element model has good accuracy in regard to analyzing the crack width of reinforced concrete slabs crushed by PPD.
- (2)
- According to the different degrees of concrete constraint on cracks, it can be divided into three categories according to its position in the slab: edge cracks, cracks between edge holes and cracks between central holes. The order of crack width in the same slab under the same conditions is cracks between edge holes > edge cracks > cracks between internal holes.
- (3)
- The amount of reinforcement in the slab has a great influence on the crushing effect of PPD. When the reinforcement spacing was reduced from 300 mm to 100 mm, the width of edge cracks, cracks between edge holes, and cracks between internal holes were reduced by 21.33%, 16.15%, and 31.40%, respectively. When the reinforcement diameter increased from 6 mm to 14 mm, the three crack widths decreased by 23.45%, 14.28%, and 23.76%. The increase in concrete strength also reduced the crack widths. When the concrete strength grade increased from C30 to C50, the crack widths decreased by 10~25%.
- (4)
- Taking the diameter and spacing of reinforcements and strength of concrete as independent variables, a unified formula for calculating the crack width of fractured reinforced concrete slabs with PPD was established, and the calculation coefficients for the width of edge cracks, cracks between edge holes, and cracks between internal holes were given, respectively. The goodness of fit R2 of statistical formula is above 0.88.
- (5)
- In this paper, a simulation analysis of the square bidirectional slab with a single bottom reinforcement was conducted. The PPD crushing effect of the reinforced concrete slab with an upper and lower double reinforcement mesh and each aspect ratio will be the focus of the next research.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Concrete Strength Grade | Compressive Strength of Cube/(MPa) | Compressive Strength of Prism/(MPa) | Tensile Strength of Prism/(MPa) | Elastic Modulus × 104 (MPa) |
---|---|---|---|---|
C20 | 25.6 | 19.5 | 1.9 | 2.83 |
C30 | 34.6 | 26.1 | 2.5 | 3.14 |
C40 | 44.3 | 30.9 | 2.7 | 3.20 |
Steel Types | Tensile Yield Strength/(MPa) | Ultimate Tensile Strength/(MPa) | Modulus × 105/(MPa) |
---|---|---|---|
331.9 | 510.6 | 2.43 |
Crack Width | Concrete Strength Classification | α | β | γ |
---|---|---|---|---|
Width of edge cracks w1 | C30 | 0.02 | 36.96 | 9.61 |
C40 | 0.02 | 36.29 | 8.92 | |
C50 | 0.02 | 38.21 | 7.68 | |
Width of cracks between edge holes w2 | C30 | 0.01 | 38.26 | 13.75 |
C40 | 0.01 | 38.41 | 12.66 | |
C50 | 0.02 | 34.65 | 11.67 | |
Width of cracks between central holes w3 | C30 | 0.02 | 37.58 | 4.67 |
C40 | 0.02 | 42.99 | 2.86 | |
C50 | 0.02 | 41.31 | 2.26 |
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Lin, X.; Yang, F.; Liu, Y.; Yang, Y. Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology. Buildings 2024, 14, 1222. https://doi.org/10.3390/buildings14051222
Lin X, Yang F, Liu Y, Yang Y. Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology. Buildings. 2024; 14(5):1222. https://doi.org/10.3390/buildings14051222
Chicago/Turabian StyleLin, Xinxin, Fei Yang, Youwei Liu, and Yang Yang. 2024. "Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology" Buildings 14, no. 5: 1222. https://doi.org/10.3390/buildings14051222