Prestressed Hollow Core Slabs 150mm
Sectional Information
Cross-section area: 124,674 X 103mm2
Moment of inertia: 301,385 X 106mm4
Section modulus top: 4,002 X 106mm3
Section modulus bottom: 4,034 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 | 24,21 kNm | 29,39 kNm | 34,14 kNm | 37,52 kNm | 42,22 kNm | 47,80 kNm |
| Ultimate Moment | 27,04 kNm | 40,04 kNm | 52,71 kNm | 61,80 kNm | 73,77 kNm | 87,65 kNm |
| Ultimate Shear Resist | 109,13 kN | 117,50 kN | 122,17 kN | 124,79 kN | 129,10 kN | 129,43 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 | 5.1 | 6.3 | 7 | 7.3 | 7.8 | 8.3 |
|---|---|---|---|---|---|---|
| 1.5 | 4.7 | 5.8 | 6.4 | 6.7 | 7.1 | 7.6 |
| 2.5 | 4.3 | 5.3 | 5.9 | 6.2 | 6.6 | 7 |
| 4 | 3.9 | 4.7 | 5.3 | 5.6 | 5.9 | 6.3 |
| 5 | 3.6 | 4.4 | 5 | 5.3 | 5.6 | 5.9 |
| 7.5 | 3.2 | 3.9 | 4.4 | 4.6 | 4.9 | 5.2 |
| 10 | 2.9 | 3.5 | 4 | 4.2 | 4.5 | 4.7 |