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Re: cold formed braced frame

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Section 2213. 8 is part of Chapter 22, Division V, the seismic provisions
for Structural Steel designed in accordance with the AISC ASD Manual.  Both
the ASD Manual and this Division are not applicable for Cold-Formed Steel.

Try UBC Chapter 22, Divisions VI, VII, and VIII for Cold-Formed Steel
requirements.  Section 2220 should be of great interest

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA


                    "Mark Baker"                                                                                    
                    <shake4bake@eart      To:     <seaint(--nospam--at)>                                               
                    05/30/01 11:58        cc:                                                                       
                    Please respond        Subject:     cold formed braced frame                                     
                    to seaint                                                                                       

any thoughts on the following:

Greenhouse structure.
Framing of light gauge, cold formed  material.
K-braced frames and x-braced frames taking  lateral.

How can I comply with UBC 2213.8 seismic provisions  which were not
intended for light gau. members?

Won't I  be mixing oranges and apples when  trying to apply adjustment
factors to allowable axial stress which incorporate  Cc and Kl/r as in

Section 2213.8.2.5 limits D/t ratio to 1300/Fy  which is far different than
the limt of .441E/Fy of AISI Spec. for Cold Formed  Steel Struct. Members.

I am inclined to design using AISI spec. for  allowable stresses and apply
omega to all connections and  members.

Any thoughts?


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