Yield Limit Equations for Nails

 

Textbook section 11.7

• main and side member(s)
• specific gravity G and dowel bearing strength F_e
• not influenced by angle of load to grain
• geometry

 

 

Penetration = nail length - thickness of side-member  (unless it sticks out of the main member)

p = l - t_s ≤ t_m

source

 

 

Dowel bearing length l_m

If p ≥ 10D

l_m = p 
l_m = l - t_s ≤ t_m

 

If 6D ≤ p < 10D

l_m = p - tip length
l_m = l - t_s - 2D ≤ t_m

or use a reduction factor with NDS tables

 

 

Bending Yield Strength F_yb

ASTM F1575 - Standard Test Method for Determining Bending Yield Moment of Nails

• 3-point bending yield test
• graph

 

NDS

higher F_yb for smaller-diameter nails due to additional cold working during manufacture

• wire manufacturing
• wire drawing
• nail manufacturing 1
• nail manufacturing 2

F_yb = 130.4 - 213.9D for low-carbon nails

30% higher for threaded hardened-steel nails

 

 

Engineered Construction Nails

minimum F_yb

ASTM F1667 - Standard Specification for Driven Fasteners: Nail, Spikes and Staples

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