when can I use "Architectural Component Design" (ASCE7-02 sec 9.6.2)?

[hippo11]

Where in the code does it tell me when and how I can determine if a building element is an "architectural component" and whether I can use sec 9.6.2?

I am working on a strength check of the roof of an existing 3-story concrete building that has a little wood framed gable roof on top, and I am wondering, for the roof seismc forces, if I can use eqn 9.6.1.3-1., or if I still have to use the Equivalent Lateral Force procedure (which is killing the wood roof because of the mass of the concrete levels below!)

Thanks

 

[hippo11]

can I call the roof a "penthouse" from table 9.6.2.2?

 

[randomizer]

FOR SEISMIC: (ASCE 7-05, Chapter 12)
If you have a 3-story concrete building, with it's own roof, then you have a small one-story wood structure on top, with a wood gable roof, then you can apply Section 12.2.3.1 Exception 1 & 2.

You can also apply Section 12.2.3.1 Exceptions a-d.

If the wood gable roof is actually the roof of the 3-stories of concrete, then you use that static design procedure, and 12.10 for diaphragms, and anchor the concrete walls to the roof for 0.8*Sds*W with sub-diaphragms.

Whether or not it is a penthouse, that is relative to the size of the wood story, relative to the concrete levels below. 20%? 50%?

Best wishes!