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type
of fastener
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shear planes:
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Cd
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Cm
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main member
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side member
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material
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material
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modulus of elasticity, E
(psi)
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modulus of elasticity, E (psi)
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spec gravity, G - wood only
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direction of load to grain
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direction of load to grain
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dimension parallel to
fastener axis
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dimension par. to fastener axis
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dimension perp. to fastener
axis
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dimension perp. to fastener axis
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no. rows
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main member
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side member
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edge dist, load parallel to
grain (inches)
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edge dist, load perp to
grain, loaded edge (inches)
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edge dist, load perp to
grain, unloaded edge (inches)
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end dist, load par. to grain,
compression (inches)
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end dist, load par. to grain,
tension (inches)
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end dist, load perpendicular
to grain (inches)
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1. Find the unadjusted
capacity for a single fastener, Z (lb).
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2. For lag screws and nails,
find penetration adjustment
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3a. Find duration of load
adjustment, Cd
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3b. Find wet service
adjustment, Cm
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3c. Find geometry factor
adjustment, CΔ
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3d. Single fastener adjusted
capacity (lb)
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4a. For multiple fasteners,
find group action factor, Cg
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4b. Number of
fasteners.
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4c. Total fastener adjusted
capacity
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1. Group action factor, Cg:
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2. Lateral design value, Z, based on yield limit equations:
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3. Geometry factor adjustments, CΔ
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Minimum and
full-value limits
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min distance
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min distance for full adjust.
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edge dist, load parallel to grain (inches)
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edge dist, load perp to grain, loaded edge (inches)
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edge dist, load perp to grain, unloaded edge (inches)
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end dist, load par. to grain, compression (inches)
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end dist, load par. to grain, tension, softwood (inches)
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end dist, load perpendicular to grain (inches)
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spacing, between rows, load par to gr (inches)
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spacing, between rows, load perp to gr (inches)
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Individual
geometry factor candidates
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main member
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side member
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edge dist,
load parallel to grain (inches)
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edge dist,
load perp to grain, loaded edge (inches)
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edge dist,
load perp to grain, unloaded edge (inches)
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end dist,
load par. to grain, compression (inches)
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end dist,
load par. to grain, tension (inches)
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end dist,
load perpendicular to grain (inches)
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Overall
geometry factor CΔ
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4. Reduction coefficient for penetration
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edge dist, load parallel to grain (main member) too small
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edge dist, load perp to grain, loaded edge (main member) too
small
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edge dist, load perp to grain, unloaded edge (main member) too
small
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end dist, load par. to grain, compression (main member) too
small
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end dist, load par. to grain, tension (main member) too small
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end dist, load perpendicular to grain (main member) too small
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edge dist, load parallel to grain (side member) too small
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edge dist, load perp to grain, loaded edge (side member) too
small
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edge dist, load perp to grain, unloaded edge (side member) too
small
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end dist, load par. to grain, compression (side member) too
small
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end dist, load par. to grain, tension (side member) too small
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end dist, load perpendicular to grain (side member) too small
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penetration inadequate
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