310
Structure: Dimensions
3. Beam spacing. The beam spacing will vary with the material selected.
A predictable and limited set of conditions is created if the framing of
each bay is identical. Therefore, any beam spacing dimension should
be a simple fraction of the bay width of 22'6". Suggested spacings
range from one-fifth to one-third the bay width, namely 4'6" or 5'7-1/2"
center to center in concrete, and 7'6" center to center in steel. The
larger beam spacings will permit larger penetrations through the
structural slab (See Section 313.5.4, Paragraph 2).
313.5.4
Structural Slab
1. Depth. The structural slab depth will vary between 4" and 5-1/2". The
depth will depend on required fire rating, density of concrete, span
length of slab, diaphragm requirements and type of steel deck (where
applicable).
2. Penetrations. The floor slab may be penetrated by gravity drains and
other comparatively small items such as vertical service shafts for
materials handling. Structural limitations on the location of these
penetrations are as follows:
a. At opening configuration:
(1)
Penetrations which fit between the beams can be located
anywhere required.
(2)
Larger openings may require bearing walls or other special
design. Their location may also be limited by the
requirements of the horizontal diaphragm (See Section
316.2).
b. At a later date:
(1)
Cored holes up to 24" diameter may be located anywhere
between beams.
(2)
Larger openings will probably require local reinforcement.
Their location may also be limited as described above.
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