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RE: Broken F1554 anchor rods

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I would require a proof load using a hydraulic tensioner that is greater
than the applied service load.  Leave the anchor rod pre-loaded (that is the
practice for petro-chemical structures).  The only requirement for couplers
for the 125% is in ACI 318 and is for rebar couplers.

Harold O. Sprague

> -----Original Message-----
> From:	Drew Morris [SMTP:dmorris(--nospam--at)]
> Sent:	Wednesday, September 18, 2002 3:54 AM
> Subject:	Broken F1554 anchor rods
> I have a project going where one of the 1" diameter F1554-55 anchor rods 
> has been broken off.  It is at a fixed base moment frame footing.  The 
> contractor got anxious and chipped out the concrete, cut off the 
> deformed top of the rod and cut threads onto the new top of the rod.  He 
> added a coupler. I asked him for information on the coupler and received 
> a standard test report from the factory in Taiwan.  It states that the 
> material is made from A563 and passed the proof load of 90 ksi.  It is 
> my understanding that couplers are required to handle 125% of the load 
> that the threaded  rod can handle.  Is A563 the proper material for the 
> coupler?
> There is some data on the geometry of the coupler but noting on the 
> cross sectional area.  Any suggestions?  I'm leaning to having him 
> replace the anchor rod and coupler and put a new anchor rod in.

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