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Re: Dynamic drift calculations (1998 CBC/1997 UBC)

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Yes, deflections are deflections, but the comparison criteria is dependent
on the loading.  If you are comparing service level deflections to an
allowable based on strength level loading you are comparing apples and
oranges, and in this case allowing 40% greater deflection levels than

Paul Feather
----- Original Message -----
From: "Jason Emoto" <jemoto(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Friday, December 15, 2000 10:37 AM
Subject: RE: Dynamic drift calculations (1998 CBC/1997 UBC)

They need an errata list for their errata list.  Deflections are not a
function of design methodology.  Your structure won't know or care whether
you use ASD or LRFD.  Think of a beam with a point load at midspan.
Regardless of whether you used ASD or LRFD to size the beam, the deflection
will be Pl^3/48EI.

Jason Emoto