Prestressed Hollow Core Slabs 120mm
Sectional Information
Cross-section area: 108,507 X 103mm2
Moment of inertia: 161,572 X 106mm4
Section modulus top: 2,679 X 106mm3
Section modulus bottom: 2,713 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 AND SHEAR CAPACITIES |
A | B | C | D |
| Service moment | 16,59 kNm | 20,22 kNm | 23,46 kNm | 25,79 kNm |
| Ultimate moment | 19,99 kNm | 29,24 kNm | 37,83 kNm | 43,41 kNm |
| Ultimate shear resist | 90,82 kN | 98,19 kN | 101,95 kN | 104,08 kN |
Standard Wiring Patterns
A = 8 X 5mm wires
B = 12 X 5mm wires
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) |
| 0.75 | 4.5 | 5.5 | 6.0 | 6.3 |
| 1.5 | 4.2 | 5.1 | 5.57 | 5.8 |
| 2.5 | 3.8 | 4.6 | 5.0 | 5.3 |
| 4.0 | 3.4 | 4.1 | 4.5 | 4.7 |
| 5.0 | 3.2 | 3.9 | 4.2 | 4.4 |
| 7.5 | 2.8 | 3.4 | 3.7 | 3.9 |
| 10 | 2.5 | 3.0 | 3.4 | 3.5 |