310
Structure: Dimensions
313.5.3
Beams
1. Span. The beam spans are equal to the structural bay lengths and
range from 40'6" to 58'6" in increments of 4'6" measured from
centerline of column to centerline of column. In addition, beams may
be cantilevered 18'0". The modular nature of the beam spans is
discussed in Section 721.1.2.
2. Cross-Section. The beam cross-section will generally be affected by
choice of material, span, beam spacing, degree of continuity and
sequence of construction. The depth, including fireproofing, is not
likely to exceed 30" in the case of the 75 psf live load, or 33" where the
live load is 115 psf.
To facilitate definition of the plumbing zone (S2), the dimension between
the bottom of the slab and the bottom of the beam should not be less than
20" -- the clearance required by drains, including traps and falls. (See
Section 353.2)
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