310
Structure: Dimensions
The width of the girders may not exceed 36" and should not be less
than the abutting column dimension. The depth of the girders may not
exceed the depth of the zones in which they occur. (See Section
224.1.) On this basis, the maximum depth of the perimeter girders will
be equal to the depth of the beams.
On the basis of a 36" width, the depth of the interior girders is not likely
to exceed 27" in the case of a 75 psf live load and 30" in the case of a
115 psf live load. These dimensions should be used for preliminary
planning and until the actual depth of zone S3 has been determined.
Where the actual depth of zone S3 on a particular project turns out to
be greater than 27" or 30", the dimensions of the interior girder may be
adjusted accordingly if economies result.
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