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UBC 1630, Ev Question

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UBC Section 1630.1.1 Equation 30-1 requires E = pEh + Ev which is stated to be
used in the load combinations of Section 1612.  In Section 1612.2.1, Basic Load
Combinations, "E" appears in two equations, 12-5 and 12-6.  HOWEVER, in reading
the SEAOC Blue Book, Ev was intended for equation 12-5 ONLY (See Blue Book
commentary C105.1.1 and Equation 101-5).

Was this a mistake or did ICBO/UBC conscientiously change this??  For a regular
building, this has the effect of changing equation 12-6 to 0.7D +/- 1.0E.  This
probably wont effect footing sizing since they are sized using allowable load
design but this could throw concrete columns into tension and could increase
anchor bolt diameter and embedment if you are using strength design (ACI 349
approach).


Thomas Hunt, S.E.
Fluor Daniel