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

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Design of Wood Members for Formwork 159
FIGURE 5-19
Summary of design for a slab form.
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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 5-8. The horizontal load shown in
Table 5-8 is in lb per lin ft, applied along the edge of the slab in
either direction as illustrated in Figure 5-20. 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.
Minimum Time for Forms and Supports to Remain in Place
The minimum time for stripping forms and removal of supporting
shores is a function of concrete strength, which should be specified by
the engineer/architect. The preferred method of determining stripping
time is using tests of job-cured cylinders or concrete in place.
The American Concrete Institute ACI Committee 347 [3] provides
recommendations for removal of forms and shores. Table 5-9 provides
the suggested minimum times that forms and supports should
remain in place under ordinary conditions. These recommendations
are in accordance with ACI Committee 347.
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