To: "SEAOC Newsletter" <seaint(--nospam--at)seaint.org>
Subject: Re: Plate vibrations
From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
Date: Sat, 25 Mar 00 21:06:09 -0600
>Does anyboby know how can I get printed only the AMPLITUDES of particular
>points of the plates (for instance the middle points) when running the
>five mode shapes ?
The only way to get actual amplitudes is multiplying the eigenmodes by
the mode coefficient which is derived from the loading. For a response
spectrum loading the mode coefficient is the product of the spectral
displacement and the participation factor. If you don't know the
excitation you can't determine the displacement.
Christopher Wright P.E. |"They couldn't hit an elephant from
chrisw(--nospam--at)skypoint.com | this distance" (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)