Page 221 - 2018_Complete_14_Collection (1)_Neat

FIRE AND SMOKE PROTECTION FEATURES

2½″ 2″ 1 /8″ 1½″ 1¼″
7
4
1 1
1″

3
2 3 2 3
4
4
7
7 5 /8″
A B
5
1 LAYER = /8″ OR ½″ 2 LAYERS = 1¼″ OR 1″ FIRE RESISTANCE (HOURS) 2 ½″
1 1 1½
1

4 2 3 6 2 3
5
4
4
7 0.5 1.0 1.5 2.0 2.5 3.0 3.5
7
C D
3 LAYERS = 1 /8″ OR 1½″ 4 LAYERS = 2½″ OR 2″
7
WEIGHT-TO-HEATED-PERIMETER RATIO (W/D)
FIGURE 722.5.1(3) For SI: 1 inch = 25.4 mm, 1 pound per linear foot/inch = 0.059 kg/m/mm.
GYPSUM-PROTECTED STRUCTURAL STEEL COLUMNS
WITH STEEL STUD/SCREW ATTACHMENT SYSTEM FIGURE 722.5.1(4)
For SI: 1 inch = 25.4 mm, 1 foot = -305 mm. FIRE RESISTANCE OF STRUCTURAL
1. Structural steel column, either wide flange or tubular shapes. STEEL COLUMNS PROTECTED WITH VARIOUS
5
2. 1 / -inch deep studs fabricated from 0.0179-inch minimum thickness THICKNESSES OF TYPE X GYPSUM WALLBOARD
8
5
7
galvanized steel with 1 / or 1 / -inch legs. The length of the steel studs
16
16
shall be / inch less than the height of the assembly. a. The W/D ratios for typical wide flange columns are listed in Table
1
2
3. Type X gypsum board or gypsum panel products in accordance with 722.5.1(1). For other column shapes, the W/D ratios shall be determined
ASTM C177, C1178, C1278, C1396 or C1658. The total thickness of in accordance with Section 722.5.1.1.
gypsum board or gypsum panel products calculated as h in Section
722.5.1.2 shall be applied vertically to an individual column using one of
the following methods:
1. As a single layer without horizontal joints.
2. As multiple layers with horizontal joints not permitted in any layer. b
3. As multiple layers with horizontal joints staggered not less than 12 f
inches vertically between layers and not less than 8 feet vertically in
any single layer. The total required thickness of gypsum board or
gypsum panel products shall be determined on the basis of the
specified fire-resistance rating and the weight-to-heated-perimeter
ratio (W/D) of the column.
1
4. Galvanized 0.0149-inch minimum thickness steel corner beads with 1 / -
2
inch legs attached to the gypsum board or gypsum panel products with 1-
inch-long Type S screws spaced 12 inches on center. t
5. No. 18 SWG steel tie wires spaced 24 inches on center. w d
6. Sheet metal angles with 2-inch legs fabricated from 0.0221-inch
minimum thickness galvanized steel.
7. Type S screws, 1 inch long, shall be used for attaching the first layer of
gypsum board or gypsum panel product to the steel studs and the third
3
layer to the sheet metal angles at 24 inches on center. Type S screws 1 / 4
inches long shall be used for attaching the second layer of gypsum board
or gypsum panel product to the steel studs and the fourth layer to the
1
sheet metal angles at 12 inches on center. Type S screws 2 / inches long FIGURE 722.5.1(5)
4
shall be used for attaching the third layer of gypsum board or gypsum WIDE FLANGE STRUCTURAL STEEL COLUMNS WITH
panel product to the steel studs at 12 inches on center. SPRAYED FIRE-RESISTANT MATERIALS

194 2018 INTERNATIONAL BUILDING CODE ®
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