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simplified wind design in ASCE 7-05 for bldgs with parapets?

simplified wind design in ASCE 7-05 for bldgs with parapets?

simplified wind design in ASCE 7-05 for bldgs with parapets?

(OP)
See ASCE 7-05 section 6.4.1.1, note #7.

This says that the simplified method for wind design can be used for buildings with either a flat roof or gable roof.  Does this mean that flat roof buildings with parapets can be analyzed using the simplified method?

Some city reviewers are saying that method 2 (analytical procedure) must be used for all buildings with parapets, and I'm not sure if that was the intent of the code.

RE: simplified wind design in ASCE 7-05 for bldgs with parapets?

I think that you are going to have a real hard time finding a flat roof building with absolutely no parapets.  Technically, anything extending afove the line of the roof is a parapet, regardless how small.  

Mike McCann
McCann Engineering

RE: simplified wind design in ASCE 7-05 for bldgs with parapets?

(OP)
I agree.  I don't think I've ever seen a flat roof building without a parapet.  That's what's confusing about the code- it seems to be saying that the simplified method can be used, but I've had some city reviewers disagree, and the code isn't clear enough to argue with them.

RE: simplified wind design in ASCE 7-05 for bldgs with parapets?

Rather than doing a whole new set of calcs, you may be able to do a comparison of parapet and no parapet to the detailed method just to show that it makes negligible difference.

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