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UBC 97 Alternate Basic Load Combinations

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Folks,

UBC 97 1612.3.2 on Alternate basic load combinations states that "... a one third increase shall be permitted in allowable stresses for all combinations, including W or E."

Notice the comma between the words COMBINATION & INCLUDING. Is that suppose to be there? Shouldn't this be "...FOR ALL COMBINATIONS THAT INCLUDES W or E."?

If not, then does that mean that for Equations 12-12,12-14,12-15, there is an allowed overstressing of 33 percent? Hypothetically, what if I do not have roof, wind or snow load? Does it mean then that (D + L) <= 1.33*Allowable O.K.?

Hope you can explain it. Thanks.


Jerome