Technical Specifications

Weyerhaeuser Edge
™
and Edge Gold
™
Specier’s Guide OSB-4000 | February 2018
3
DESIGN PROPERTIES
In most applications, Edge
™
and Edge Gold
™
floor panels will be specified based on the span rating of the panel. However, in some uses, engineers will require actual design
values to support application-specific engineering calculations. The Design Values table below provides industry-standard design values for OSB based on information in the
International Building Code (IRC).
The panel design values do not need to be adjusted for panel grade or construction. However, they must be adjusted for duration of load (DOL) and creep when appropriate, and
may also require other adjustments that are not shown in this guide. Refer to the current ASD Manual for Engineered Wood Construction for applications with elevated moisture
or temperatures, applications that require preservative or fire-retardant treatment, or for panels less than 24" in width.
Geometric cross-sectional properties: To calculate the geometric cross-sectional properties for a specific Edge
™
or Edge Gold
™
panel, use the nominal thickness from the
Design Values table below and assume a uniform rectangular cross section.
Creep: Under constant load, the deflection of wood-based products generally increases over time—a phenomenon known as creep. In typical applications, with relatively low
dead loads, it is not necessary to consider creep in the design process. However, when the potential for creep exists—specifically, when a permanent or constant load will stress
the panels to one-half or more of their design strength capacity—an adjustment to the deflection calculations should be made. For Edge
™
or Edge Gold
™
panels in dry-use
conditions, apply the creep adjustment factor (C
C
= 0.50) to the panel stiffness.
Permanent load (over 10 years) 0.90
Occupancy live load 1.00
2 months, as for snow 1.15
7 days 1.25
Wind or earthquake 1.60
Impact 2.00
Duration of Load (C
D
)
(Applies to strength capacities)
2-Span to 1-Span 3-Span to 1-Span
Deflection 0.42 0.53
Moment 1.00 0.80
Shear 1.25 1.20
Span Adjustments
■
When adjusting uniform loads based on strength from the
Allowable Uniform Loads table on page 4, use the span
adjustment factor for moment.
■
When adjusting uniform loads calculated from the equa-
tions on page 5, use the appropriate corresponding factor.
Moisture Condition OSB
Dry 0.50
Creep Adjustment Factor (C
C
)
(For permanent loads)
■
When a permanent or constant load will stress a
panel to ½ or more of its design strength capacity,
adjust the deflection calculation by applying the
creep adjustment factor (C
c
) to the panel stiffness
(EI) found above.
APPLICATION ADJUSTMENT FACTORS
Axial Compression
Span rating = 20" o.c. 24" o.c. 32" o.c. 48" o.c.
Nominal thickness =
19
⁄32",
5
⁄8"
23
⁄32"
7
⁄8" 1
1
⁄8"
Strength axis
(1)
=
Primary Secondary Primary Secondary Primary Secondary Primary Secondary
Bending
Moment capacity
(lb-in./ft of width)
F
b
S = 575 250 770 385 1,050 685 1,900 1,200
Stiffness
(lb-in.
2
/ft of width)
EI = 210,000 40,500 300,000 80,500 650,000 235,000 1,150,000 495,000
Shear
Shear capacity in-the-plane
(lb/ft of width)
F
s
( b/Q)
= 205 205 250 250 300 300 385 385
Rigidity through-the-thickness
(lb/in. of panel depth)
G
v
t
v
= 87,000 87,000 93,000 93,000 110,000 110,000 155,000 155,000
Shear capacity through-the-thickness
(lb/in. of shear-resisting panel length)
F
v
t
v
= 195 195 215 215 230 230 305 305
Axial
Axial tension capacity
(lb/ft of width)
F
t
A = 2,900 2,100 3,350 2,550 4,000 3,250 5,600 4,750
Axial compression capacity
(lb/ft of width)
F
c
A = 4,200 4,000 5,000 4,300 6,300 6,200 8,100 6,750
Stiffness
(lb/ft of width x10
6
)
EA = 5.00 2.90 5.85 3.30 7.50 4.20 8.20 4.60
(1) The primary strength axis is the long direction of the panel unless otherwise noted.
General Notes
■
Table is based on information from the International
Building Code (IBC).
■
Value must be adjusted for duration of load, creep,
elevated moisture or temperature, applications that
require preservative or fire-retardant treatment, or for
panels less than 24" in width when appropriate. Refer to
the current Manual for Engineered Wood Construction.
■
Values do not need to be adjusted for panel grade or
construction.
Design Values for Edge
™
and Edge Gold
™
Floor Panels (100% Load Duration)
Axial Tension
Shear-in-the-Plane
(Rolling or Interlaminar Shear)
Shear-through-the-Thickness
Bending
Nail or Screw Design Values
■
Design values for nails or screws used with Edge
™
and EdgeGold
™
panels can be computed by engineers using the same NDS
®
procedures
used for other structural wood products.
■
For withdrawal, use equivalent Specific Gravity (SG) as follows:
smooth- or screw-shank nails = 0.40, ring-shank nails = 0.70, wood
screws = 0.45. Design values for nail or screw withdrawal resistance
are shown in NDS
®
Table 12.2B (screws) and Table 12.2C (nails).
■
For lateral resistance, use equivalent Specific Gravity (SG) = 0.50.
Design values for nail or screw lateral resistance are found in NDS
®
Tables 12L (screws) and 12N (nails).