2306.4.1 Wood
structural panel shear walls. The allowable shear capacities
for wood structural panel shear walls shall be in accordance
with Table 2306.4.1. These
capacities are permitted to be increased 40 percent for
wind design. Shear walls are permitted to be calculated
by principles of mechanics without limitations by using
values for nail strength given in the AF&PA NDS and
wood structural panel design properties given in the APA
Panel Design Specification.
2306.4.2 Lumber
sheathed shear walls. Single and double diagonally sheathed
lumber diaphragms are permitted using the construction and
allowable load provisions of Sections
2306.3.4 and 2306.3.5.
2306.4.3 Particleboard
shear walls. The design shear capacity of particleboard
shear walls shall be in accordance with Table
2306.4.3. Shear panels shall be constructed with particleboard
sheets not less than 4 feet by 8 feet (1219 mm by 2438 mm),
except at boundaries and changes in framing. Particleboard
panels shall be designed to resist shear only, and chords,
collector members and boundary elements shall be connected
at all corners. Panel edges shall be backed with 2-inch
(51 mm) nominal or wider framing. Sheets are permitted to
be installed either horizontally or vertically. For 3/8-inch
(9.5 mm) particleboard sheets installed with the long dimension
parallel to the studs spaced 24 inches (610 mm) o.c, nails
shall be spaced at 6 inches (152 mm) o.c. along intermediate
framing members. For all other conditions, nails of the
same size shall be spaced at 12 inches (305mm)o.c. along
intermediate framing members. Particleboard panels less
than 12 inches (305 mm) wide shall be blocked. Particleboard
shall not be used to resist seismic forces in structures
in Seismic Design Category D, E or F.
2306.4.4 Fiberboard
shear walls. The design shear capacity of fiberboard
shear walls shall be in accordance with Table
2306.4.4. The fiberboard sheathing shall be applied
vertically or horizontally to wood studs not less than 2
inch (51 mm) in nominal thickness spaced 16 inches (406
mm) o.c. Blocking not less than 2 inch (51 mm) nominal in
thickness shall be provided at horizontal joints. Fiberboard
shall not be used to resist seismic forces in structures
in Seismic Design Category D, E or F.
2306.4.5 Shear
walls sheathed with other materials. Shear capacities
for walls sheathed with lath, plaster or gypsum board shall
be in accordance with Table
2306.4.5. Shear walls sheathed with lath, plaster or
gypsum board shall be constructed in accordance with Chapter
25 and Section 2306.4.5.1. Walls resisting seismic loads
shall be subject to the limitations in Section
12.2.1 of ASCE 7.
2306.4.5.1
Application of gypsum board or lath and plaster to wood
framing.
2306.4.5.1.1
Joint staggering. End joints of adjacent courses
of gypsum board shall not occur over the same stud.
2306.4.5.1.2
Blocking. Where required in Table
2306.4.5, wood blocking having the same cross-sectional
dimensions as the studs shall be provided at joints
that are perpendicular to the studs.
2306.4.5.1.3
Fastening. Studs, top and bottom plates and blocking
shall be fastened in accordance with Table
2304.9.1.
2306.4.5.1.4
Fasteners. The size and spacing of fasteners shall
be set forth in Table 2306.4.5.
Fasteners shall be spaced not less than 3/8
inch (9.5 mm) from edges and ends of gypsum boards or
sides of studs, blocking and top and bottom plates.
2306.4.5.1.5
Gypsum lath. Gypsum lath shall be applied perpendicular
to the studs. Maximum allowable shear values shall be
as set forth in Table 2306.4.5.
2306.4.5.1.6
Gypsum sheathing. Four-foot-wide (1219 mm) pieces
of gypsum sheathing shall be applied parallel or perpendicular
to studs. Two-foot-wide (610 mm) pieces of gypsum sheathing
shall be applied perpendicular to the studs. Maximum
allowable shear values shall be as set forth in Table
2306.4.5.
2306.4.5.1.7
Other gypsum boards. Gypsum board shall be applied
parallel or perpendicular to studs. Maximum allowable
shear values shall be as set forth in Table
2306.4.5.
