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

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Forms for Beams and Floor Slabs 353
spacing along the stringers or joists, checking to be certain that this
spacing does not exceed that determined in steps 3 and 4.
Design of Formwork for Flat-Slab Concrete Floor with
Joists and Stringers
Design formwork for a flat-slab concrete floor as illustrated in
Figure 11-11. The design includes the decking, joists, and stringers.
Requirements for shoring of formwork are discussed in the following
section. The following design criteria will apply:
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1. Thickness of concrete slab, 6 in.
2. Concrete unit weight, 150 lb per cu ft
3. Deflection limited to l/360, but not greater than ¹⁄16 in.
4. All form lumber will be S4S No. 2 grade Southern Pine
Span length of joists
(spacing of stringers)
Span length of plywood
(spacing of joists)
Span length
of sringers
(spacing
shores)
Plywood
sheathing
Shores, for supports of stringers
Joists, for support of plywood
Stringers, for support of joists
FIGURE 11-11 Allowable span lengths and components of a slab form.
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