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Wind load cases

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When using ASCE 7-05, load combination for wind case 2.4.7 as follow:

0.6D+W+H


from this load case analysis, reactions forces at foundation are generated. What are the proper safety factors:

Sliding:                         Safety Factor=1.0 or 1.5

Overturning:                  Safety Factor=1.0 or 1.5

Upward reaction:           Safety factor 1.0 or 1.5

I think it could  be 1.5, but my coworkers state the 1.5 has been built it into the load combination  in the following form: 0.9D/1.5= 0.6D.

Does anybody has come across any ASCE reference or commentary about this subject?