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spatial steel roof - seismic

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I am working on the design of a two-storey building in accordance with the UBC 97 code. The lower part of the building is RC moment resisting frame type. The upper part includes  inclined tree branches of  tubular steel columns, roof barrels and trusses etc.


  1. Is there a publication specific to similar structures (spatial steel roof systems) for seismic analysis and design?
  2. What are the UBC code seismic requirements such as structural response parameter R, overstrength factor, etc. for the upper structure. Any specific requirements for similar (mixed) buildings ?  

Thanks in advance for any contributions.

Yilmaz Yuva