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ASCE 7 Wind Zone Widths

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campbelltc

Structural
Sep 21, 2011
28
If there are multiple types of roofs for a building, how would you go about determining the a and 2a Zone Widths for smaller areas of roof?

Say there's a 200' x 300' building with a flat roof with mean roof height of 100' but there's a smaller upper gable roof 20' higher that is 50' x 50' in plan. (a = 20', 2a = 40' for the main roof)

Would you use the same a and 2a Zone Widths on the upper gable roof as the lower flat roof, or would you consider smaller Zone Widths for the upper roof since it's smaller in plan? (a = 5', 2a = 10')?
 
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