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Building Design and Construction Handbook - Merritt - Ventech!

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10.54 SECTION TEN<br />

10.14.2 Wet-Service Factor<br />

TABLE 10.28 Adjusted <strong>Design</strong> Values for<br />

Connections*<br />

Bolts:<br />

Z� � ZC DC MC tC gC �<br />

Split-ring <strong>and</strong> shear-plate connectors:<br />

P� � PC C CCCCC<br />

D M t g � d st<br />

Q� � QC C C C C C<br />

D M t g � d<br />

Lag screws:<br />

W� � WC C C C<br />

D M t eg<br />

Z� � ZC C CCCCC<br />

D M t g � d eg<br />

Wood screws:<br />

W� � WC C C<br />

D M t<br />

Z� � ZC C C C C<br />

D M t d eg<br />

Nails <strong>and</strong> spikes:<br />

W� � WC C C C<br />

D M t tn<br />

Z� � ZC C C C C C C<br />

D M t d eg di tn<br />

Metal plate connectors:<br />

Z� � ZC DC MC t<br />

Drift bolts <strong>and</strong> drift pins:<br />

W� � WC C C C<br />

D M t eg<br />

Z� � ZC C CCCCC<br />

D M t g � d eg<br />

Spike grids:<br />

Z� � ZC DC MC tC �<br />

Timber rivets:<br />

P� � PC C C C<br />

D M t st<br />

Q� � QC C C C C<br />

D M t � st<br />

* The adjustment factors are as follows:<br />

C D � load duration factor, not to exceed 1.6 for<br />

connections (Art. 10.14.1)<br />

C M � wet-service factor, not applicable to toe-nails<br />

loaded in withdrawal (Art. 10.14.2)<br />

C t � temperature factor (Art. 10.14.3)<br />

C g � group-action factor (Art. 10.14.4)<br />

C � � geometry factor (Art. 10.14.5)<br />

C d � penetration-depth factor (Art. 10.14.6)<br />

C eg � end-grain factor (Art. 10.14.7)<br />

C st � metal-side-plate factor (Art. 10.14.8)<br />

C di � diaphragm factor (Art. 10.14.9)<br />

C tn � toenail factor (Art. 10.14.10)<br />

Nominal design values apply to wood that will be used under dry-service conditions;<br />

that is, where moisture content of the wood will be a maximum of 19% of<br />

the oven-dry weight, as would be the case in most covered structures. For connections<br />

in wood that is unseasoned or partly seasoned, or when connections will be<br />

exposed to wet-service conditions in use, nominal design values should be multiplied<br />

by the appropriate wet-service factor C M in Table 10.29.

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