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
 

( Wiring Pattern )

MOMENT AND 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

 

( 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 8.0 8.5 9.1
2.5 5.0 6.1 7.0 7.4 7.9 8.4
4.0 4.5 5.5 6.3 6.8 7.2 7.6
5.0 4.2 5.2 6.0 6.4 6.8 7.2
7.5 3.7 4.6 5.3 5.7 6.0 6.4
10 3.4 4.1 4.8 5.2 5.5 5.8

Design loads include self weight, grouting between joints and finishes up to 1,5kN/m2.