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RE: spatial steel roof - seismic

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Yilmaz –


Read UBC section 1630.4 – Combinations of Structural Systems


The easiest thing to do would be to design the whole structure for the lowest R value…which would be 3.5 if you are using Ordinary Reinforced Concrete Moment Frame.


Eli Grassley

PSM Engineers

Seattle, WA


-----Original Message-----
From: YILMAZ YUVA [mailto:yyburak(--nospam--at)]
Sent: Saturday, February 19, 2005 3:02 AM
To: seaint(--nospam--at)
Subject: spatial steel roof - seismic


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