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'97 UBC Basic Load Combination

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Dear Seaint,

When using Sec. 1612.3.1  Basic Load Combination (12-11)  D+.75[L+(Lr or S) + (W or E/1.4)], the Code allowed using Cd(Cd = 1.33 for seismic or wind) for wood per UBC '97 Sec. 2316.2.   Would using Cd = 1.33 consider to be double dipping because there is a reduction in force of .75?

As for the Alternate basic load combination (Sec. 1612.3.2), Eqn.(12-16) D+L+S+E/1.4, the code does not allow using Cd since one-third increase is permitted in allowable stresses.

Is there a typo in the Basic Load Combination?

Thank you,


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