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SECTION
721 CALCULATED FIRE RESISTANCE
721.5.1.1
General. These procedures establish a basis for determining
the fire resistance of column assemblies as a function of
the thickness of fire-resistant material and, the weight,
w, and heated perimeter, D, of steel columns. As used in these
sections, W is the average weight of a structural steel column
in pounds per linear foot. The heated perimeter, D, is the
inside perimeter of the fire-resistant material in inches
as illustrated in Figure 721.5.1(1).
721.5.1.1.1
Nonload-bearing protection. The application of these
procedures shall be limited to column assemblies in which
the fire-resistant material is not designed to carry any
of the load acting on the column.
721.5.1.1.2
Embedments. In the absence of substantiating fire-endurance
test results, ducts, conduit, piping, and similar mechanical,
electrical, and plumbing installations shall not be embedded
in any required fire-resistant materials.
721.5.1.1.3
Weight-to-perimeter ratio. Table
721.5.1(1) contains weight-to-heated-perimeter ratios
(W/D) for both contour and box fire-resistant profiles,
for the wide flange shapes most often used as columns. For
different fire-resistant protection profiles or column cross
sections, the weight-to-heated-perimeter ratios (W/D) shall
be determined in accordance with the definitions given in
this section.
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