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97 UBC 2213.8.5 - mechanical penthouses=stories? braces have str ength for OMEGAo*Eh/1.4 or OMEGAo*Eh?

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For an ordinary braced frame building where the braces do not meet the b/t
or KL/r or <70% tension or compression,  97 UBC 2213.8.5 says "Braced frames
not meeting the requirements of Sections 2213.8.2 and 2213.8.4 may be used
in buildings not over two stories in height and in roof structures as
defined in Chapter 15 if the braces have the strength to resist OMEGAo times
the design seismic forces."

These are ASD provisions,  does this section mean the braces need to have
the strength for OMEGAo*Eh/1.4 or OMEGAo*Eh?

Are mechanical penthouses considered stories for the purposes of this
section?  The section says and roof structures defined in Chapter 15 - what
is this saying - anyone know a code section?


Scott M Haan P.E.
Plan Review Engineer
Building Safety Division
Development Services Department
Municipality of Anchorage

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