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Re: "dynamic analysis" for earthquake ?

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In FEA-land, dynamic analysis can be a direct time integration transient
analysis, but more often is a spectrum analysis where the load  response vs
frequency curve envelopes a number of events and is therefore hopefully
conservative. There are also mode superposition transient analyses where
mode shapes/frequencies are used to characterize structural response to a
time load  history.

>From the ANSYS FEA documentation

"A spectrum analysis is one in which the results of a modal analysis are
used with a known spectrum to calculate displacements and stresses in the
model. It is mainly used in place of a time-history analysis to determine
the response of structures to random or time-dependent loading conditions
such as earthquakes, wind loads, ocean wave loads, jet engine thrust, rocket
motor vibrations, and so on"

There is an NRC guide that can provide some guidance for pressure vessels
and associated attachments.

Chuck Ritter
JAR Associates
ritter(--nospam--at)jar.com
401-294-4589 fax 401-294-3826

----- Original Message -----
From: "Tom Barsh @ Codeware" <tom(--nospam--at)codeware.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, June 07, 2005 12:09 PM
Subject: "dynamic analysis" for earthquake ?


> What qualifies as a "dynamic analysis" for response of a structure to an
> earthquake?
>
> If the question is too elementary I will expand. Thank you!
>
>
>    Tom Barsh, P.E.
>    Technical Support Engineer
>    Codeware Inc
>    www.codeware.com
>
>
>
>
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