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

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Design of Wood Members for Formwork 109
FIGURE 5-8 Multiple-span beam with concentrated loads.
concentrated loads, the maximum deflection can usually be approximated
from Eq. (5-24) with sufficient accuracy for form design.
For a beam with three equal loads P acting a multiple-span beam
as shown in Figure 5-8, the maximum deflection can be calculated
from Eq. (5-24).
∆= 5Pl 3 /384EI (5-24)
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Deflection of Beams with Uniform Loads
A beam may have a uniformly distributed load applied over a portion
or the entire length of the beam. The amount of deflection
depends on the magnitude of the distributed load, length and size of
beam, grade and species of the beam, and the number and location of
supports underneath the beam.
Single-Span Beams with Uniformly Distributed Loads
For a uniformly loaded beam supported at each end as shown in
Figure 5-9, the maximum deflection at the center of the beam can be
calculated by Eq. (5-25):
∆= 5Wl 3 /384EI (5-25)
FIGURE 5-9 Single-span beam with uniformly distributed load.
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