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 5.3
Secondary
Structural Framing. Secondary members may be constructed
of either
hot-rolled or cold-formed steel. Purlins and girts shall
be doubly
symmetrical sections of constant depth and they may be
built-up,
cold-formed, or hot-rolled structural shapes
5.3.1
Maximum spacing of roof purlins and wall girts shall not exceed 4
feet.
5.3.2
Compression flanges of purlins and girts shall be laterally braced
to withstand any combination of loading.
5.3.3
Supporting lugs shall be used to connect the purlins and girts to
the primary framing. The lugs shall be designed to restrain the
light gauge sections from tripping or warping at their supports.
Each member shall be connected to each lug by a minimum of two
fasteners.
5.3.4
End wall columns shall be hot rolled and shall consist of welded
built-up "I" section or structural steel "C" or "I" shapes.
5.3.5
Fasteners for all secondary framing shall be 1/2 inch diameter
(0.003 zinc plated) bolts conforming to ASTM A307. The fasteners
shall be tightened to "snug tight" condition. Plain washers shall
conform to ANSI standard B18.22.1.
6.
ANCHORAGE.
6.1
Anchorage. The building anchor bolts for both primary and
secondary columns shall conform to ASTM A307 steel and shall be
designed to resist the column reactions produced by the specified
design loading. The quantity, size and location of anchor bolts
shall be specified and furnished by the building manufacturer. A
minimum of two anchor bolts shall be used with each column.
6.2
Column Base Plates. Base plates for columns shall conform to ASTM
A36 and shall be set on a grout bed of 1 inch minimum thickness.
7.
ROOF AND WALL COVERING.
7.1
Roof and wall panels shall conform to zinc-coated steel, ASTM A446,
G90 coating designation. Minimum depth of each panel corrugation
shall be 1-1/2 inches and shall have a material thickness of
22 gauge. The minimum yield strength of panel material shall be
33,000 psi. Wall panels shall be applied with the longitudinal
configurations in the vertical position. Roof panels shall be
applied with the longitudinal configuration in direction of the
roof slope.
7.1.1
Structural properties of roof and wall panels shall be equal to or
greater than the following:
Section Modulus (in3/ft)
Surface
Roof
Wall
Outer Face in
Compression
Outer Face in
Tension
2.08-246
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