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Re: more aci 318

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        Why does the bolt itself have to fail in ductile failure?  Why can't a plate or similar detail that is connected to the bolt be used to provide the ductile failure?
H. Daryl Richardson
----- Original Message -----
Sent: Tuesday, August 05, 2008 10:09 AM
Subject: more aci 318

This bolt thing is becoming more frustrating.


I have been doing anchor bolt shear/tension calc for a 1000# piece of electrical equipment mounted on a pad with ½? dia. anchor bolts (manufacturers frame provides holes for ½? dia bolts). The pad is 8? by 8?.


I have found that a 14? deep concrete pad with cast in place bolts embedded 8? is required for ductile failure, my closest edge distance is 18?. I cannot have brittle failure due to seismic category D.


What used to be a 30 minute calc for loading and bolt design has turned into hours of *&^$%#@ and a pad design that is embarrassing to provide the client and contractor.


Aaaargh !!


Mark D. Baker

Baker Engineering