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Load Combination, Using Strength Design

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IBC 2006, Eq. 16-3: 1.2D + 1.6Lr + 0.8WL
The wind load is always uplift. Therefore, it will actually help the roof live load. In your opinion, do I have to set the wind load as zero in this combination?
If so, why do they also have Eq. 16-2, with only 0.5Lr? Or, why don't they have another equation with just DL and roof live load?
Thank you,

Farzin S. Rahbar, SE
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041