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Home > Forums > Structural Engineers > Activities > Structural engineering other technical topics Forum

Threaded Rebar

thread507-324515
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ododbefar (Mechanical)
22 Jun 12 19:47
Dear all,
There is any stander talking about threaded Rebar, its tolerance and its specification and can I assume the rebar as bolts and nuts and apply its specification on rebar material?
thanks
BAretired (Structural)
22 Jun 12 20:24
I have never used threaded rebar, but all-thread rod is commonly available. I think it is mild steel, but it may be available in higher grades as well.

BA

slickdeals (Structural)
22 Jun 12 21:16
There are a few suppliers of all-thread bars. Some of these are 150 ksi or better.

http://www.williamsform.com/Threaded_Bars/150_KSI_...
http://www.dsigroundsupport.com/products/dywidag-t...

Important Note:
Not all all-thread bars meet the deformation requirements for rebar (deformed bar) per ASTM standards. You cannot expect to put an all-thread bar in lieu of a rebar and expect the "exact" same behavior in terms of development length etc.

What are you trying to use the all-thread bar for?
azcats (Structural)
23 Jun 12 0:22
http://www.portlandbolt.com/products/rods/threaded...

These are big bars that are turned down and threaded. So you do get actual rebar behavior with their embed. But it's really big stuff. I wonder if a machine shop could do the same with smaller sizes?

What's the application and load?
Ron (Structural)
23 Jun 12 6:54
Generally, no. You'll have to work around the differences in material behaviour, not the least of which is a difference in the bond strength between the two when embedded in concrete. Their strengths are different and their elongations can be significantly different.

As azcats asked "What's the application and load?"
ododbefar (Mechanical)
23 Jun 12 7:58
Thanks for all, and what about threading geometry and tolerances in Rebar.
wahts the essential variable about it (how i can reject or accept the threaded part)
ododbefar (Mechanical)
23 Jun 12 8:58
I need these threaded Rebar for precast marine works
ododbefar (Mechanical)
23 Jun 12 9:00
the expected load is 500 Mpa
dik (Structural)
23 Jun 12 9:27
Dywidag meets the requirements for deformation on their rebar... nuts and couplers for this product are a bit pricey.

Can you get by with regular bolts... or can they be fabricated from rod with a heavy hex head nut welded at the bottom and threaded at the top?

Dik
hawkaz (Structural)
23 Jun 12 17:46
Thanks to Appendix D, I have had to do this a few times for holdown anchors. This has mainly occured at wood shear walls bearing on top of concrete walls. There just isn't enough edge distance to get any headed stud to work. I have developed a bar into the wall and extended a threaded segment at the top for holdown anchorage.
hokie66 (Structural)
23 Jun 12 18:50
ododbefar,
Be careful with your material selection. 500 MPa is not a load, it is a stress, and that is about the ultimate limit for commonly available reinforcing bars. Once you thread a bar, the load carrying capacity is reduced considerably, both from the reduced area and from the fact that the outer skin of a reinforcing bar is stronger than the centre. As mentioned above, there are manufacturers of reinforcing, e.g. Dywidag, Reid, which will accept a nut.
ztengguy (Structural)
25 Jun 12 7:44
Dayton superior does threaded rebar, They have a process where the threaded coupling is not a reduced area, so you get full capacity of the rebar.
slickdeals (Structural)
25 Jun 12 8:32
ztengguy,
The question was regarding the use of threaded bar in lieu of conventional rebar. What you are mentioning is parallel threads (cold forged) vs. tapered thread couplers.
ztengguy (Structural)
25 Jun 12 8:38
@ slickdeals. I guess I didnt see where the OP wanted to change to threaded rod.

Make sure your coupler is compatible and is strong enough if you use threaded rod. Can be the weak link.
transmissiontowers (Structural)
26 Jun 12 7:39
The electric utility industry uses threaded rebar anchor bolts all the time for connections to foundations. We always specify a minimum Charpy Impact value at a low temperature for the larger bars like 18J which is a special 18 jumbo that can be threaded for 2.25" bolts. The F1554 smooth anchor rods with threads on both ends are used for the larger bolts.

_____________________________________
I have been called "A storehouse of worthless information" many times.

hokie66 (Structural)
27 Jun 12 6:27
The question was obviously not specific enough. I and others at first took it to mean standard rebar with a threaded end, but then we got into discussions of all thread bar, and rebar designed for couplers. Maybe the OP can enlighten us as to the actual material he is talking about.
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