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RE: ASD vLRFD

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Below is what I do.

Also, I've heard the "alternate" factors will become "standard" with the next
ACI 318.  Is this still on the way?

-Keith Fix, PE
-Little Rock, AR

--- "Adair, Joel" <JAdair(--nospam--at)Halff.com> wrote:
> You can avoid tracking two sets of load factors if you use the alternate
> load and strength reduction factors in Appendix C of ACI 318-99.
> 
> -- Joel
> 
> -------------------------
> Joel Adair, EIT
> Halff Associates, Inc. 
> E-mail: jadair(--nospam--at)halff.com 
> -------------------------
> 
> 
> -----Original Message-----
> From: HAWNENG(--nospam--at)aol.com [mailto:HAWNENG(--nospam--at)aol.com]
> Sent: Wednesday, December 19, 2001 11:38 PM
> To: Seaint(--nospam--at)seaint.org
> Subject: RE: ASD vLRFD
> 
> 
> Having not posted anything to the list server in many months, I could not 
> help but "weigh-in" on this discussion (pun intended).  Our office uses 
> nothing but "allowable stress design" and has since 1981.  We find that many
> 
> times, our design is governed by deflection, not stress.   We check 
> deflection at two stages, immediately after the mud is poured and then for 
> total deflection.  For "mud load" deflection, we try to limit the deflection
> 
> to 1/2".  Often times, rather than camber a steel member, we will increase 
> the member size by a few pounds to limit the deflection.  In the discussion 
> to date, I haven't read how deflection and floor vibrations play a role in 
> sizing the steel members.  We also design and detail all our steel 
> connections on the structural drawings then review the shop drawings to help
> 
> ensure the contractor is interpreting the drawings as intended by our
> design.
> 
> Not that this is necessarily the best way to design, but ASD gets my vote.  
> Also, when it comes to the foundation design, you have to track two sets of 
> different load factors.  Yes, we do design concrete by ultimate stress 
> design.  We are definitely middle-aged engineers, but not real old-timers, 
> yet.
> 
> Greg Showerman, S.E.
> Modesto, California
>   
> 
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