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Foundations for Shear Walls

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We are designing mostly residential structures in high wind country and are routinely faced with issues of large uplift and download forces - 5 to 20 kips -  generated by overturning resistance forces at the ends of shear wall segments.  Some conditions have the loads very close together, as in using a Simpson Strongwall, while others might be 6 to 10 feet apart with conventional wood frame shear wall segments.  Supporting concrete is typically a monolithic slab edge member or interior thickened slab footer.  How should the concrete be designed?  Is it advisable/required to have enough weight of concrete to resist the entire uplift?  How are people handling this issue? 
Mike Rhodebeck, P.E.
Vice President, Engineering
Builders FirstSource
Florida Design Center, LLC
6550 Roosevelt Blvd.
Jacksonville, FL  32244
904.772.6100  X2285
Fax: 904.317.2835