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Re:Alternative Load Combination in UBC97

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Thank Mr.Turk for your advise.

As per UBC Section 1612.3.1, load combination for ASD, in combination
with wind or earthquake load, are as follows:

   1. D + (W or E/1.4)
   2. 0.9D + E/1.4
   3. D + 0.75[L + (Lr or S) + (W or E/1.4)]

Here, 0.75 of load reduction factor is applied only when more than one
variable loads(= minimum two variable loads) are combined with dead
load, and applied not to dead load but to variable loads only.(Refer to
commentary 2.4.3 of ASCE7-95.)

In load combination of '1' and '2' above, on the contrary to traditional
design, either 0.75 load factor or 1.33 stress increase can not be
applied.

My question is that, if then, I have done wrong design based on wrong
concept, so far.

Soojin, Hur