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DESIGN PRINCIPLES AND CALCULATIONS - SLAB DESIGN<br />
Table 1 - Slab Capacity Chart (Total Load in psf)<br />
SLAB d MESH SIZE 4’-1 1/4” JOIST SPACING<br />
THICKNESS (t) F y = 60,000 psi Exterior Interior<br />
t ≥ 2 1/2” 6 x 6 W2.0 x W2.0 114 123<br />
Extra mesh at 1 & 2<br />
when required<br />
1<br />
Spacing S1<br />
L1<br />
1.6” 6 x 6 W2.0 x W2.9 157 172<br />
No chair 6 x 6 W4.0 x W4.0 210 230<br />
t ≥ 3” with 2.1” 6 x 6 W2.9 x W2.9 206 226<br />
1/2” Rod 6 x 6 W4.0 x W4.0 279 306<br />
(shop welded to top chord)<br />
t ≥ 3 1/2” 2.6” 6 x 6 W2.9 x W2.9 256 280<br />
with 2 1/2” 6 x 6 W4.0 x W4.0 347 380<br />
Chair<br />
Note: Slab capacities are based on mesh over joists raised as indicated.<br />
2 4<br />
4 Location<br />
indexing<br />
numbers<br />
S2 /3<br />
3 3<br />
Spacing S2<br />
L2<br />
Fig. 2<br />
Spacing Si<br />
L2<br />
Slab thickness<br />
greater<br />
than 2 1/2”<br />
3
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