1 Introduction
2 Research Significance
3 Methodology and Procedures Experiment
3.1 Advanced Numerical Modelling and Nonlinear Analyses
3.2 Description of Punching Shear Failure
3.3 Test Setup and Measurement
3.4 Reinforced Concrete Slab Test
3.5 Punching Shear Resistance and Failure of the Tested Slab
Section number | Values relative to the level of reinforcement | Values relative to the level of the lower surface of the slab | |||||
---|---|---|---|---|---|---|---|
Distance of the crack from the centre of the loaded area (mm) | Distance of the crack from the loaded area (mm) | Ratio d | Angle of inclination (°) | Distance of the crack from the centre of the loaded area (mm) | Distance of the crack from the loaded area (mm) | Angle of inclination (°) | |
1 | 247 | 147 | 1.79 | 29.01 | 409 | 309 | 13.20 |
2 | 228 | 128 | 1.56 | 32.39 | 333 | 233 | 19.88 |
3 | 231 | 131 | 1.60 | 31.81 | 331 | 231 | 20.78 |
4 | 299 | 199 | 2.43 | 22.36 | 453 | 353 | 13.86 |
5 | 254 | 114 | 1.39 | 35.32 | 336 | 196 | 24.80 |
6 | 283 | 143 | 1.74 | 29.67 | 428 | 288 | 14.68 |
7 | 252 | 112 | 1.37 | 35.77 | 304 | 164 | 35.73 |
8 | 283 | 143 | 1.74 | 29.67 | 434 | 294 | 14.12 |
Average value | 259.63 | 139.63 | 1.70 | 30.75 | 378.50 | 258.50 | 19.63 |
Determinative deviation s | 24.27 | 25.57 | 0.31 | 3.96 | 54.42 | 59.01 | 7.22 |
Variation range R | 71.00 | 87.00 | 1.06 | 13.42 | 149.00 | 189.00 | 22.53 |
4 Calculation of Load Capacity of Tested Slab
4.1 Load Capacity of Tested Slab According to EC2
Maximum loading force depending on input parameters | Compressive cylinder strength (MPa) | Coefficient CRx,c | Coefficient γC | Maximal force (kN) | ||
---|---|---|---|---|---|---|
Designation | Value (MPa) | Designation | Value (MPa) | |||
Mean values |
f
cm
| 27.11 |
C
Rm,c
| 0.22 | 1.0 | 177.42 |
Characteristic values |
f
ck
| 24.20 |
C
Rk,c
| 0.18 | 1.0 | 139.77 |
Standard values |
f
ck
| 16.00 |
C
Rd,c
| 0.12 | 1.5 | 60.13 |
4.2 Load Capacity of Tested Slab with Influence of Contact Surface
Maximum loading force depending on input parameters | Compressive cylinder strength (MPa) | Coefficient CRx,c | Coefficient γC | Maximum force (kN) | ||
---|---|---|---|---|---|---|
Designation | Value (MPa) | Designation | Value (MPa) | |||
Mean values |
f
cm
| 27.11 |
C
Rm,c
| 0.22 | 1.0 | 178.42 |
Characteristic values |
f
ck
| 24.20 |
C
Rk,c
| 0.18 | 1.0 | 140.55 |
Design values |
f
ck
| 16.00 |
C
Rd,c
| 0.12 | 1.5 | 60.47 |
4.3 Advanced Nolinear Analysis to Determine Total Load Capacity
Input value | Compressive cylinder strength | Tensile strength | Fracture energy | Modulus of elasticity of concrete | Modulus of elasticity of subsoil (MPa) | |
---|---|---|---|---|---|---|
23.86 | 33.86 | |||||
Fc (MPa) | Ft (MPa) | Gf (N/m) | Ec (MPa) | Max. loading force (kN) | ||
Mean values | 27.11 | 2.14 | 132 | 29,978 | 355.75 | 380.36 |
Characteristic values | 24.20 | 1.92 | 130 | 28,865 | 357.39 | 357.75 |
Standard values | 16.00 | 1.20 | 120 | 25,146 | 289.57 | 292.80 |