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Re: Single Plate Connection of Collectors Procedure

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Does the failure mode become irrelevant because the design forces are higher?

-Keith Fix, PE
-Little Rock, Arkansas

--- Rick.Drake(--nospam--at)Fluor.com wrote:
> 
> Collectors should not be designed for ductile limit states.  They should be
> designed for omega-sub-zero forces.  Reference  1997 UBC, Sec. 1633.2.6 or
> 2000 IBC Sec. 1620.1.6.
> 
> Rick Drake, SE
> Fluor Daniel, Aliso Viejo, CA
> 
> *********
> 
> 
> 
> 
>                                                                              
>                                                          
>                       Markajohn(--nospam--at)cs.com                                       
>                                                          
>                       11/25/02 09:40 PM        To: seaint(--nospam--at)seaint.org         
>                                                          
>                       Please respond to                                      
>                                                          
>                       seaint                   cc:                           
>                                                          
>                                                                              
>                                                          
>                                                Subject:  Single Plate
> Connection of Collectors Procedure                               
>                                                                              
>                                                          
>                                                                              
>                                                    ..... 
>                                                                              
>                                                          
> 
> 
> 
> 
> Hello,
> 
> I have an analysis problem that must be fairly common.
> 
> I am analyzing some existing connections of W18 and larger collectors into
> columns.  They are one-sided plate connections with connection plate held
> by
> stiffeners on top and bottom similar to Fig. 10-25 on page 10-158 and Fig.
> 10-28 on page 10-159 of the 3rd ed AISC LRFD manual.  The difference is
> that
> with my connections, there would be a large axial load in the beams as well
> 
> as gravity loads.
> 
> The design would need to take into account beam-end rotation like Table X
> in
> the old ASD 9th ed, but also account for the axial loads.  In addition, the
> 
> governing limit state must be ductile because I am in Seismic Zone 4.
> 
> I haven't seen a design procedure that address this situation.  I would
> appreciate any Ideas on procedures or approaches
> 
> TIA
> Mark Johnson PE
> 
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