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| 255 |
Deep Prestressed Concrete
Hollow Block Slab |
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| N255 Block |
Rib Centers 600 mm |
In-Situ Concrete
0.094 m³/m² |
| 440x220x255 |
Self Weight 4.00
kN/m² |
M of Inertia
4.716E-04 m4/m |
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| Qk
Service Loads in kN / m² for given Spans |
| Wire Option |
Ultimate Moment Mu
kNm/m |
Ultimate Shear Vu
kN/m |
Spans
(mm) |
| 3500 |
3600 |
4500 |
4600 |
4800 |
5000 |
5200 |
5400 |
5600 |
5800 |
5900 |
6000 |
6200 |
6400 |
6600 |
6800 |
7000 |
7100 |
7300 |
7500 |
| 3 |
20.3 |
30.8 |
5.3 |
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| 5 |
32.2 |
36.5 |
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9.4 |
5.0 |
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| 7 |
42.9 |
40.9 |
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7.1 |
6.3 |
5.6 |
4.9 |
4.4 |
3.8 |
3.4 |
3.2 |
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| 8 |
49.1 |
42.7 |
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3.8 |
3.4 |
3.0 |
2.6 |
2.3 |
1.9 |
1.6 |
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| N255 Block |
Rib Centers 750 mm |
In-Situ Concrete
0.144 m³/m² |
| 440x220x255 |
Self Weight 4.42
kN/m² |
M of Inertia
6.950E-04 m4/m |
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| Qk
Service Loads in kN / m² for given Spans |
| Wire Option |
Ultimate Moment Mu
kNm/m |
Ultimate Shear Vu
kN/m |
Spans
(mm) |
| 3500 |
3600 |
4500 |
4600 |
4800 |
5000 |
5200 |
5400 |
5600 |
5800 |
5900 |
6000 |
6200 |
6400 |
6600 |
6800 |
7000 |
7200 |
7400 |
7600 |
| 3 |
32.2 |
46.1 |
9.8 |
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| 5 |
50.6 |
57.7 |
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15.7 |
9.2 |
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| 7 |
66.7 |
61.2 |
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12.4 |
11.2 |
10.0 |
9.0 |
8.1 |
7.3 |
6.6 |
6.3 |
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| 8 |
76.0 |
64.0 |
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7.2 |
6.6 |
6.0 |
5.4 |
4.9 |
4.4 |
3.5 |
2.6 |
1.9 |
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Slabs Propped
during
construction at equal
centers of 1.5m or less |
Superload Limited
by Strength
Moment
Shear |
Superload Limited
by Deflection
Less than 15mm always
Less than span/250 |
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Site maintained by:
TradePage |
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Designed by: Matt Jones-- |
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