Prestressed Hollow Core Slabs 200mm
Sectional Information
Cross-section area: 148,970 X 103mm2
Moment of inertia: 661,627 X 106mm4
Section modulus top: 6,579 X 106mm3
Section modulus bottom: 6,654 X 106mm3
Total breadth of webs: 468mm
Centroidal axis from bottom: 32,5mm
Conc. 28 day strength: 50MPa
Conc. strength at transfer: 35MPa
Mod. of elasticity of concrete: 34kN/mm2
Stressing of strand / wire: 70%
Check: stresses at transfer: OK
Cover to steel: 30mm
Structural Information
Wiring Pattern
| MOMENT & SHEAR CAPACITIES | A | B | C | D | E | F |
|---|---|---|---|---|---|---|
| Service Moment | 38,23 kNm | 46,02 kNm | 53,31 kNm | 58,50 kNm | 65,72 kNm | 74,33 kNm |
| Ultimate Moment | 38,54 kNm | 57,81 kNm | 77,10 kNm | 90,89 kNm | 111,02 kNm | 136,03 kNm |
| Ultimate Shear Resist | 143,04 kN | 153,20 kN | 159,88 kN | 163,61 kN | 169,34 kN | 170,50 kN |
Standard Wiring Patterns
A = 8 X 5mm wires
E = 4 X 5mm wires + 8 X 9,53mm strand
B = 12 X 5mm wires
F = 12 X 9,53mm strand (over 7m span – 2 x 5mm top wire)
C = 9 X 5mm wires + 3 X 9,53mm strand
D – 7 X 5mm wires + 5 X 9.53mm strand
Load Capacity Table
Live Load – Wiring Pattern
| kN/m2 | A Span (m) | B Span (m) | C Span (m) | D Span (m) | E Span (m) | F Span (m) | 0.75 | 5.8 | 7.2 | 8.2 | 8.7 | 9.2 | 9.8 |
|---|---|---|---|---|---|---|
| 1.5 | 5.4 | 6.6 | 7.7 | 8 | 8.5 | 9.1 |
| 2.5 | 5 | 6.1 | 7 | 7.4 | 7.9 | 8.4 |
| 4 | 4.5 | 5.5 | 6.3 | 6.8 | 7.2 | 7.6 |
| 5 | 6 | 5.2 | 6 | 6.4 | 6.8 | 7.2 |
| 7.5 | 3.7 | 4.6 | 5.3 | 5.7 | 6 | 6.4 |
| 10 | 3.4 | 4.1 | 4.8 | 5.2 | 5.5 | 5.8 |