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// CODE SNIPPET

2306.2 Wood-Frame Diaphragms

2015 Michigan Building Code > 23 Wood > 2306 Allowable Stress Design > 2306.2 Wood-Frame Diaphragms
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Wood-frame diaphragms shall be designed and constructed in accordance with AWC SDPWS. Where panels are fastened to framing members with staples, requirements and limitations of AWC SDPWS shall be met and the allowable shear values set forth in Table 2306.2(1) or 2306.2(2) shall be permitted. The allowable shear values in Tables 2306.2(1) and 2306.2(2) are permitted to be increased 40 percent for wind design.

TABLE 2306.2(1)
ALLOWABLE SHEAR VALUES (POUNDS PER FOOT) FOR WOOD STRUCTURAL PANEL DIAPHRAGMS UTILIZING STAPLES
WITH FRAMING OF DOUGLAS FIR-LARCH, OR SOUTHERN PINE" FOR WIND OR SEISMIC LOADINGf
PANEL
GRADE
STAPLE LENGTH
AND GAGEd
MINIMUM
FASTENER
PENETRATION
IN FRAMING
(inches)
MINIMUM
NOMINAL
PANEL
THICKNESS
(inch)
MINIMUM NOMINAL
WIDTH OF
FRAMING
MEMBERS AT
ADJOINING PANEL
EDGES AND
BOUNDARIESe
(inches)
BLOCKED
DIAPHRAGMS
UNBLOCKED
DIAPHRAGMS
Fastener spacing (inches) at
diaphragm boundaries (all cases) at continuous
panel edges parallel to load (Cases 3, 4), and at all
panel edges (Cases 5, 6)b
Fasteners spaced 6 max. at
supported edgesb
6 4 21/2c 2c Case 1 (No
unblocked edges or
continuous joints
parallel to load)
All other
configurations
(Cases 2, 3, 4, 5 and 6)
Fastener spacing (inches) at other panel edges
(Cases 1, 2, 3 and 4)b
6 6 4 3
Structural I grades 11/2 16 gage 1 3/8 2 175 235 350 400 155 115
3 200 265 395 450 175 130
15/32 2 175 235 350 400 155 120
3 200 265 395 450 175 130
Sheathing, single
floor and other
grades covered in
DOC PS 1 and PS 2
11/2 16 gage 1 3/8 2 160 210 315 360 140 105
3 180 235 355 400 160 120
7/16 2 165 225 335 380 150 110
3 190 250 375 425 165 125
15/32 2 160 210 315 360 140 105
3 180 235 355 405 160 120
19/32 2 175 235 350 400 155 115
3 200 265 395 450 175 130
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
  1. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NOS. (2) For staples find shear value from table above for Structural I panels (regard less 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.
  2. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
  3. Framing at adjoining panel edges shall be 3 inches nominal or wider.
  4. 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.
  5. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
  6. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table above shall be multiplied by 0.63 or 0.56, respectively.


TABLE 2306.2(2)
ALLOWABLE SHEAR VALUES (POUNDS PER FOOT) FOR WOOD STRUCTURAL PANEL BLOCKED DIAPHRAGMS
UTILIZING MULTIPLE ROWS OF STAPLES (HIGH-LOAD DIAPHRAGMS) WITH FRAMING OF
DOUGLAS FIR-LARCH OR SOUTHERN PINE" FOR WIND OR SEISMIC LOADINGb,g,h
PANEL GRADEc STAPLE
GAGEf
MINIMUM
FASTENER
PENETRATION
IN FRAMING
(inches)
MINIMUM
NOMINAL
PANEL
THICKNESS
(inch)
MINIMUM NOMINAL
WIDTH OF FRAMING
MEMBER AT
ADJOINING PANEL
EDGES AND
BOUNDARIESe
LINES OF
FASTENERS
BLOCKED DIAPHRAGMS
Cases 1 and 2d
Fastener Spacing Per Line at
Boundaries
(inches)
4 21/2 2
Fastener Spacing Per Line at
Other Panel Edges (inches)
6 4 4 3 3 2
Structural I grades 14 gage
staples
2 15/32 3 2 600 600 860 960 1,060 1,200
4 3 860 900 1,160 1,295 1,295 1,400
19/32 3 2 600 600 875 960 1,075 1,200
4 3 875 900 1,175 1,440 1,475 1,795
Sheathing single
floor and other
grades covered in
DOC PS 1 and PS 2
14 gage
staples
2 15/32 3 2 540 540 735 865 915 1,080
4 3 735 810 1,005 1,105 1,105 1,195
19/32 3 2 600 600 865 960 1,065 1,200
4 3 865 900 1,130 1,430 1,370 1,485
23/32 4 3 865 900 1,130 1,490 1,430 1,545
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
  1. For framing of other species: (1) Find specific gravity for species of framing lumber in ANSI/ AWC 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.
  2. Fastening along intermediate framing members: Space fasteners a maximum of 12 inches on center, except 6 inches on center for spans greater than 32 inches
  3. Panels conforming to PS 1 or PS 2.
  4. This table gives shear values for Cases l and 2 as shown in Table 2306.2(1). The values shown are applicable to Cases 3, 4, 5 and 6 as shown in Table 2306.2(1), providing fasteners at all continuous panel edges are spaced in accordance with the boundary fastener spacing.
  5. The minimum nominal depth of framing members shall be 3 inches nominal. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
  6. 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.
  7. High-load diaphragms shall be subject to special inspection in accordance with Section 1705.5.1.
  8. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table above shall be multiplied by 0.63 or 0.56, respectively

2306.2.1 Gypsum Board Diaphragm Ceilings

Gypsum board diaphragm ceilings shall be in accordance with Section 2508.5.

Related Code Sections


2306.2 Wood, Wood-Frame Diaphragms
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