ASD/LRFD Manual - American Wood Council
ASD/LRFD Manual - American Wood Council
ASD/LRFD Manual - American Wood Council
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86 M11: DOWEL-TYPE FASTENERS<br />
M11.1 General<br />
This Chapter covers design of connections between<br />
wood members using metal dowel-type (nails, bolts, lag<br />
screws, wood screws, drift pins) fasteners.<br />
These connectors rely on metal-to-wood bearing<br />
for transfer of lateral loads and on friction or mechanical<br />
interfaces for transfer of axial (withdrawal) loads. They<br />
are commonly available in a wide range of diameters and<br />
lengths.<br />
M11.2 Reference Withdrawal Design Values<br />
The basic design equation for dowel-type fasteners<br />
under withdrawal loads is:<br />
W′p ≥ R W<br />
where:<br />
W′ = adjusted withdrawal design value<br />
R W = axial (withdrawal) force<br />
p = depth of fastener penetration into<br />
wood member<br />
Reference withdrawal design values are tabulated in<br />
NDS Chapter 11.<br />
M11.3 Reference Lateral Design Values<br />
The basic equation for design of dowel-type fasteners<br />
under lateral load is:<br />
Z′ ≥ R Z<br />
where:<br />
Z′ = adjusted lateral design value<br />
R Z = lateral force<br />
Reference lateral design values are tabulated in NDS<br />
Chapter 11.<br />
M11.4 Combined Lateral and Withdrawal Loads<br />
Lag screws, wood screws, nails, and spikes resisting<br />
combined lateral and withdrawal loads shall be designed<br />
in accordance with NDS 11.4.<br />
<strong>American</strong> <strong>Wood</strong> <strong>Council</strong>
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