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Re: 97 UBC Drift: ASD vs Strength Design

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I believe the intent of the statement "Where allowable stresses....." in 
section 1630.9.1 is to clarify that once you determine that drift 
requirements are satisfied and you want to check the stresses in the 
elements, you can reduce the earthquake forces by 1.4 if allowable stress 
method is used. This does not imply that you can check drift requirements by 
reducing the base shear by 1.4. Delta, S is always determined at strength 
level regardless of what method you use for checking element stresses.