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Alternate load combinations

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UBC 1928.1.2.3 has the following load combo:
5.  1.2D + 1.5E + (0.5L or 0.2S)
The combo in UBC 1612.2.1 has:
     1.2D + 1.0E + (f1L + f2S)
Is the 1.5 factor on the seismic force correct in
chapter 19 combo?  Why is it 50% larger?
Dan Goodrich, P.E.