J Hook with Bolt
J Hook with Bolt
(OP)
I have a client who wants to install a single pole sign (typical to gas station signs). So with the Anchor Bolts undergoing tension i would design the AB to be 1" headed (hex or square) F1554 with 25" embedt. And the client has some 54" J bolts on hand... So i explained how the extra length doesn't mater once the bottom hook straitens out and becomes a smooth dowel. that is 54" long. One thing we mentioned was adding a bolt and washer at the end of the j-hook so when the hook tries to pull up the head will resist this motion by pushing into the center of the pier.
Now i am not sure how to analyze this :). I know the failure mecanism of the sideways force but the logic seems to be the bolt will only engage when the confined Hook straitens which cannot straiten with the headed bolt.
I was hoping one of you could shed some light on the matter if this is a crazy idea, a bad idea, and why.
Thank you
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Now i am not sure how to analyze this :). I know the failure mecanism of the sideways force but the logic seems to be the bolt will only engage when the confined Hook straitens which cannot straiten with the headed bolt.
I was hoping one of you could shed some light on the matter if this is a crazy idea, a bad idea, and why.
Thank you
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+--/






RE: J Hook with Bolt
Try to find some research paper or design guidance dealing with this arrangement. My money's on Restreppo or Eigenhousen (sp?) having done something on this. I have a fair number of anchoring design guides; I'll see what I can find once I get home.
Just as an aside: My first reaction would be to advise the client/owner that the unknown is dangerous in this business and to cut down the J-hook anchors to straight anchors that will do the job.
RE: J Hook with Bolt
The epoxy bolts installed with adequate embed depth failed the steel. It was impressive.
RE: J Hook with Bolt
Dik
RE: J Hook with Bolt
RE: J Hook with Bolt
Thanks for the information!