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Re: Single Plate Connection of Collectors Procedure

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Got it.  Thanks.

-Keith
--- Rick.Drake(--nospam--at)Fluor.com wrote:
> 
> The failure modes involved are never irrelevant.  They are the key to the
> seismic provisions of the various building codes.
> 
> The seismic provision of the various building codes are designed to force
> favorable limit states such as yielding and plastic hinging.  At the same
> time, they are trying to prevent unfavorable limit states such as fracture,
> local buckling, and global buckling.  Whenever the seismic provisions
> requires that an item or connection be designed for omega-sub-zero forces,
> it is acknowledging that it is associated with unfavorable limit states
> that should be kept closer to elastic behavior.  This in turn, allows the
> favorable limit states in the adjacent members to be reached first.
> 
> In the case of collectors, they are being kept closer to elastic to allow
> the frames that they are connecting to reach their ductile limit states
> first.
> 
> Rick Drake, SE
> Fluor Daniel, Aliso Viejo, CA
> 
> ******
> 
> 
> 
>                                                                              
>                                                          
>                       Keith Fix                                              
>                                                          
>                       <kefix(--nospam--at)yahoo.com>        To: seaint(--nospam--at)seaint.org         
>                                                          
>                       11/26/02 07:48 AM                                      
>                                                          
>                       Please respond to        cc:                           
>                                                          
>                       seaint                                                 
>                                                          
>                                                Subject:  Re: Single Plate
> Connection of Collectors Procedure                           
>                                                                              
>                                                          
>                                                                              
>                                                    ..... 
>                                                                              
>                                                          
> 
> 
> 
> 
> 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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