Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 23 - Wood › Section 2306 - ALLOWABLE STRESS DESIGN › Subsection 2306.3 - Wood structural panel shear walls

Current through Register 1525, July 5, 2024
Wood structural panel shear walls shall be designed and
				  constructed in accordance with AF & PA SDPWS. Wood structural panel shear
				  walls are permitted to resist horizontal forces using the allowable capacities
				  set forth in Table 2306.3. Allowable capacities in Table 2306.3 are permitted
				  to be increased 40 percent for wind design.
TABLE 2306.3 ALLOWABLE SHEAR (POUNDS PER FOOT) FOR WOOD
				  STRUCTURAL PANEL SHEAR WALLS WITH FRAMING OF DOUGLAS FIR-LARCH OR SOUTHERN
				  PINEa FOR WIND OR SEISMIC LOADINGb, h,
				  i, j, l
PANEL GRADE
MINIMUM NOMINAL PANEL THICKNESS
							 (inch)
MINIMUM FASTENER PENETRATION IN
							 FRAMING (inches)
PANELS APPLIED DIRECT TO
							 FRAMING
PANELS APPLIED OVER ½" OR
							 5/8" GYPSUM SHEATHING
NAIL (common or galvanized box) or
							 staple sizek
Fastener spacing at panel edges
							 (inches)
NAIL (common or galvanized box) or
							 staple sizek
Fastener spacing at panel edges
							 (inches)
6
4
3
2e
6
4
3
2e
Structural I sheathing
3/8
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
230d
360d
460d
610d
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
280
430
550f
730
1
1½ 16 Gage
155
235
315
400
2 16 Gage
155
235
310
400
7/16
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
255d
395d
505d
670d
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
280
430
550f
730
1
1½ 16 Gage
170
260
345
440
2 16 Gage
155
235
310
400
15/32
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
280
430
550
730
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
280
430
550f
730
1
1½ 16 Gage
185
280
375
475
2 16 Gage
155
235
300
400
1½
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
340
510
665f
870
-
-
-
-
-
Sheathing, plywood sidinge, g except
							 Group 5 Species
5/16c or
							 1/4c
11/4
6d (2" × 0.113" common, 2" × 0.099"
							 galvanized box)
180
270
350
450
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
180
270
350
450
1
1½ 16 Gage
145
220
295
375
2 16 Gage
110
165
220
285
3/8
11/4
6d (2" × 0.113" common, 2" × 0.099"
							 galvanized box)
200
300
390
510
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
200
300
390
510
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
220d
320d
410d
530d
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
260
380
490f
640
1
1½ 16 Gage
140
210
280
360
2 16 Gage
140
210
280
360
7/16
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
240d
350d
450d
585d
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
260
380
490f
640
1
1½ 16 Gage
155
230
310
395
2 16 Gage
140
210
280
360
15/32
13/8
8d (2½" × 0.131" common, 2½"
							 × 0.113" galvanized box)
260
380
490
640
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
260
380
490f
640
1½
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
310
460
600f
770
-
-
-
-
-
1
1½ 16 Gage
170
255
335
430
2 16 Gage
140
210
280
360
19/32
1½
10d (3" × 0.148" common, 3" × 0.128"
							 galvanized box)
340
510
665f
870
-
-
-
-
-
1
13/4 16 Gage
185
280
375
475
-
-
-
-
-
Nail Size (galvanized casing)
Nail Size (galvanized casing)
5/16c
11/4
6d (2" × 0.099")
140
210
275
360
8d (2½" × 0.113")
140
210
275
360
3/8c
13/8
8d (2½" × 0.113")
160
240
310
410
10d (3" × 0.128")
160
240
310f
410
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939
							 N/m.
a. For framing of other species: (1) Find specific gravity
							 for species of lumber in AF & PA NDS. (2) For staples find shear value from
							 table above for Structural I panels (regardless of actual grade) and multiply
							 value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for
							 all other species. (3) For nails find shear value from table above for nail
							 size for actual grade and multiply value by the following adjustment factor:
							 Specific Gravity Adjustment Factor = [1-(0.5 -SG)], where SG = Specific Gravity
							 of the framing lumber. This adjustment factor shall not be greater than 1.
b. Panel edges backed with 2-inch nominal or wider framing.
							 Install panels either horizontally or vertically. Space fasteners maximum 6
							 inches on center along intermediate framing members for 3/8-inch and 7/16-inch
							 panels installed on studs spaced 24 inches on center. For other conditions and
							 panel thickness, space fasteners maximum 12 inches on center on intermediate
							 supports.
c. 3/8-inch panel thickness or siding with a span rating
							 of 16 inches on center is the minimum recommended where applied directly to
							 framing as exterior siding. For grooved panel siding, the nominal panel
							 thickness is the thickness of the panel measured at the point of nailing.
d. Allowable shear values are permitted to be increased to values
							 shown for 15/32-inch sheathing with same nailing provided (a) studs are spaced
							 a maximum of 16 inches on center, or (b) panels are applied with long dimension
							 across studs.
e. Framing at adjoining panel edges shall be 3
							 inches nominal or wider, and nails at all panel edges shall be staggered where
							 panel edge nailing is specified at 2 inches on center or less.
f.
							 Framing at adjoining panel edges shall be 3 inches nominal or wider, and nails
							 at all panel edges shall be staggered where both of the following conditions
							 are met: (1) 10d (3" × 0.148") nails having penetration into framing of
							 more than 11/2 inches and (2) panel edge nailing is specified at 3 inches on
							 center or less.
g. Values apply to all-veneer plywood. Thickness
							 at point of fastening on panel edges governs shear values.
h.
							 Where panels are applied on both faces of a wall and nail spacing is less than
							 6 inches o.c. on either side, panel joints shall be offset to fall on different
							 framing members. Or framing shall be 3-inch nominal or thicker at adjoining
							 panel edges and nails at all panel edges shall be staggered.
i. In
							 Seismic Design Category D, E or F, where shear design values exceed 350 pounds
							 per linear foot, all framing members receiving edge nailing from abutting
							 panels shall not be less than a single 3-inch nominal member, or two 2-inch
							 nominal members fastened together in accordance with Section 2306.1 to transfer
							 the design shear value between framing members. Wood structural panel joint and
							 sill plate nailing shall be staggered at all panel edges. See Sections 4.3.6.1
							 and 4.3.6.4.3 of AF & PA SDPWS for sill plate size and anchorage
							 requirements.
j. Galvanized nails shall be hot dipped or tumbled.
k. Staples shall have a minimum crown width of 7/16 inch and shall
							 be installed with their crowns parallel to the long dimension of the framing
							 members.
l. For shear loads of normal or permanent load duration
							 as defined by the AF & PA NDS, the values in the table above shall be
							 multiplied by 0.63 or 0.56, respectively.