Beams
A convenient formula for approximating the
dimensions of a concrete beam is the following
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based on the cross-sectional
dimensions 'b' and 'd':
where: 'b' = beam width (inches); 'd' = beam
depth (inches); Mu = Max moment in beam (ft-kips)
The required area of tension steel reinforcing can be approximated by the following formula:
where: As = area of steel (square inches); Mu
= max moment in beam (ft-kips); 'd' = beam depth (inches)
Under normal building loading conditions, the minimum depth of beams using Grade 60 reinforcing should be the following:
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Simply
Supported: D = L/16
§
One
End Continuous: D = L/18
§
Both
Ends Continuous: D = L/20
§
Cantilever:
D = L/8
Moment of Inertia
