type
of fastener















shear planes:

Cd

Cm



















main member


side member


material


material



modulus of elasticity, E
(psi)


modulus of elasticity, E (psi)



spec gravity, G  wood only





direction of load to grain


direction of load to grain



dimension parallel to
fastener axis


dimension par. to fastener axis



dimension perp. to fastener
axis


dimension perp. to fastener axis






no. rows
















main member


side member


edge dist, load parallel to
grain (inches)





edge dist, load perp to
grain, loaded edge (inches)





edge dist, load perp to
grain, unloaded edge (inches)





end dist, load par. to grain,
compression (inches)





end dist, load par. to grain,
tension (inches)





end dist, load perpendicular
to grain (inches)











1. Find the unadjusted
capacity for a single fastener, Z (lb).





2. For lag screws and nails,
find penetration adjustment





3a. Find duration of load
adjustment, Cd





3b. Find wet service
adjustment, Cm





3c. Find geometry factor
adjustment, CΔ





3d. Single fastener adjusted
capacity (lb)





4a. For multiple fasteners,
find group action factor, Cg





4b. Number of
fasteners.





4c. Total fastener adjusted
capacity
































1. Group action factor, Cg:




2. Lateral design value, Z, based on yield limit equations:













3. Geometry factor adjustments, CΔ









Minimum and
fullvalue limits

min distance

min distance for full adjust.



edge dist, load parallel to grain (inches)





edge dist, load perp to grain, loaded edge (inches)





edge dist, load perp to grain, unloaded edge (inches)





end dist, load par. to grain, compression (inches)





end dist, load par. to grain, tension, softwood (inches)





end dist, load perpendicular to grain (inches)















spacing, between rows, load par to gr (inches)





spacing, between rows, load perp to gr (inches)










Individual
geometry factor candidates

main member

side member



edge dist,
load parallel to grain (inches)





edge dist,
load perp to grain, loaded edge (inches)





edge dist,
load perp to grain, unloaded edge (inches)





end dist,
load par. to grain, compression (inches)





end dist,
load par. to grain, tension (inches)





end dist,
load perpendicular to grain (inches)




















Overall
geometry factor CΔ










4. Reduction coefficient for penetration


















edge dist, load parallel to grain (main member) too small



edge dist, load perp to grain, loaded edge (main member) too
small



edge dist, load perp to grain, unloaded edge (main member) too
small



end dist, load par. to grain, compression (main member) too
small



end dist, load par. to grain, tension (main member) too small



end dist, load perpendicular to grain (main member) too small









edge dist, load parallel to grain (side member) too small



edge dist, load perp to grain, loaded edge (side member) too
small



edge dist, load perp to grain, unloaded edge (side member) too
small



end dist, load par. to grain, compression (side member) too
small



end dist, load par. to grain, tension (side member) too small



end dist, load perpendicular to grain (side member) too small















penetration inadequate


