(no subject)

From: <Christopher>
Date: Wed Sep 19 2001 - 23:34:00 EDT

>For Pipe Stress analysis, for modelling seismic (eathquake) to simplify we
>have to convert into g forces.

At one time a constant acceleration assumption was the norm for seismic analysis, but that's pretty much obsolete these days. The standard technique is usually based on a response spectrum which shows accelerations for a range of structural frequencies. A constant acceleration isn't much good for piping since it's pretty soft, structurally will have several fundamental frequencies. The USNRC and ASME Code section III has guidelines (and Code requirements) for piping seismic analysis.

Christopher Wright P.E. |"They couldn't hit an elephant from <a href="/group/PipingDesign/post?postID=IjhMT0SRyzimSGOCTRS75oRaUDiD1FxCdIJMRrvNY-HZ91U40vBE8GAmAQR-MqxrF0FHmlJWxUXBoDjt">chrisw@skypoint.com</a> | this distance" (last words of Gen.

___________________________| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw">http://www.skypoint.com/~chrisw</a> Received on Wed Sep 19 23:34:00 2001