Types of Fasteners and Connections

 

Connection Stiffness

1. mechanical
   1. nails
   2. bolts
   3. lag bolts/screws
   4. split ring & shear plate connections
   5. wood screws
   6. metal plate connectors 1, 2, 3
   7. timber rivets 1
   8. drift bolts & pins 1
   9. spike grids 1
2. adhesive
   1. glulam
   2. plywood
   3. OSB
   4. wood I-joists
3. mechanical + adhesive
   1. floor sheathing 1, 2

mechanical stiffness >> adhesive stiffness

 

 

Lateral / Shear Loading

• load ⊥ length
• number of shear planes

Use the weakest plane.

  

  

 Parallel Loading

• load // length
• tension  →  withdrawal
• bearing stress under washer  →  compression ⊥ to grain

furniture cams  (see C04)

 

 

Reference Design Values

Z -  shear loading
W  -  withdrawal loading

idealized conditions

• 10-year duration
• dry conditions
• normal temperatures

 

 

Adjusted Design Values

NDS table 10.3.1