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RE: Cassion Steel Casing check

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Roark's "Formulas for Stress and Strain" has a lot of pipe shell structural formulas.  Don't forget to consider slenderness of the pipe.  AISC and API have requirements for this.


Aren't you designing for active pressure?  Passive pressure is the dumb one that just sits there and takes it.  Active pressure is the bully in the school yard that you have to deal with.  Somebody correct me if I'm wrong here.


Bob Garner


From: Dilip Patel [mailto:dp_enco(--nospam--at)]
Sent: Tuesday, April 07, 2009 10:22 AM
To: seaint(--nospam--at)
Subject: Cassion Steel Casing check


I need to design check 36" dia, 30'+ deep, caisson steel casing wall
thickness with rail loads about 10' from caisson.
It should be the earth passive pressure that will  be critical.
Any formulas for hoop  stress (tensile) in walls from passive pressure available.