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Re: Bolt Head Pull Through

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I had a similar problem. We tested the bolt/plate assembly for actual loads required to simulate the failure.

James Cohen
James Cohen Consulting, P.C.
PO Box 130
Pennington, NJ 08534
Tel: (609) 730-0510
Fax: (609) 730-0511
----- Original Message -----
Sent: Thursday, April 19, 2001 0:20
Subject: Bolt Head Pull Through

OK here's an interesting one for your forensic fancies. 
I'm looking at a failed connection, fab'd from a 1/4" plate, probably A36, welded to a 1/2-round piece of pipe (Sch80).  5/8" dia 316SS hex head bolt (no washer) pulled neatly through the 11/16" dia hole.  Very nice, uniform curling down of the steel all around the hole which enlarged it enough for the bolt to slip through.  This was repeated 2 times each support on about 16 supports all around a tank.  The bolt did not fail, and does not visually appear to have bent/sheared/necked down.
I shudder at estimating based on energy methods applied to the deflected shape.  Anyone know of an empirical or analytical report to aid in determining what the force was at pull-through? 
Laurence B. Oeth PE