Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Forms for Beams and Floor Slabs 363
Solid Slab
Thickness, in.
Dead Load,
lb per sq ft
P, lb per lin ft, Applied Along Edge
of Slab in Either Direction
Width of Slab in Direction of Force, ft
20 40 60 80 100
4 65 100 100 100 104 130
6 90 100 100 108 144 180
8 115 100 100 138 184 230
10 140 100 112 168 224 280
12 165 100 132 198 264 330
14 190 100 152 228 304 380
16 215 100 172 258 344 430
20 265 106 212 318 424 530
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Notes:
1. Reprinted from “Formwork for Concrete,” ACI Special Publication No. 4, the
American Concrete Institute.
2. Slab thickness given for concrete weighing 150 lb per cu ft; allowance of 15 lb
per sq ft for weight of forms. For concrete of a different weight or for joist slabs
and beams and slab combinations, estimate dead load per sq ft and work from
dead load column, interpolating as needed on a straight-line basis. Do not
interpolate in ranges that begin with 100 lb minimum load.
3. Special conditions may require heavier bracing.
TABLE 11-9 Minimum Lateral Force for Design of Slab Form Bracing, lb per
lin ft
Minimum Lateral Force for Design of
Slab Form–Bracing Systems
The minimum lateral loads required for the design of slab form bracing
are presented in Table 11-9. The horizontal load shown in Table 5-8 is in
pounds per linear foot, applied along the edge of the slab in either direction
as illustrated in Figure 11-13. Where unbalanced loads from the
placement of concrete or from starting or stopping of equipment may
occur, a structural analysis of the bracing system should be made.
FIGURE 11-13 4 × 4 Minimum lateral force for bracing slab-forming systems.
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