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development of threaded rod

development of threaded rod

development of threaded rod

(OP)
Does anybody know of a good reference for determining the development length of threaded rod in concrete?  Is it simply a factor of the development of rebar in concrete?

RE: development of threaded rod

I would say that would be a starting point - with all the threads, I can't imagine it would be more than a rebar - the bond between the cement matrix and the rod would be great or greater than that of the rebar.

RE: development of threaded rod

I have come across threaded bars in the design.  The threaded bars were there for other reasons as I cannot imagine an engineer in his/her right mind would want to thread a bar to save in the development length.  I would just specify the development length of unthreaded bar even if it is threaded.  In practice the threaded bar will have a superior grip and should never develop a bond failure.  Being marginally smaller than the un-threaded equivalent (due to the thread) it actually needs a shorter development length too.

RE: development of threaded rod

My gut feel tells me that threaded rod would need more embeddment than rebar.  Say that each "V" in the thread is a little bit of concrete to be sheared off.  The depressions between the deformations in a rebar are much further apart and then give much more surface to be sheared.  Also, I beleive the deformations are much higher/deeper than those from a threaded rod.  

If it were me, I'd put some nuts and a washer or a steel plate at the end of the bar and design it as a regular anchor.

For some reason I don't think embedding a straight bar is the way to go.

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