All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
(OP)
I was asked to review calculations and drawings for the foundation design for an out-of-state supplier of wind turbines. I noticed on the drawings that they called for #7 A615 Grade 75 "Anchor Bolts" and immediately marked the drawings and calcs that A615 Grade 75 is a rebar designation, and that F1554 (Gr 36, 55, or 105) was the proper spec for "Anchor Rods." After an internet search, I have now seen that there are in fact A615 Gr 75 all-thread rebars, though it appears they are mostly used in soil nail and ground tie-back applications.
Is this a common anchor rod spec the wind turbine industry? Is there any reason that I should reject the calcs and ask that they be based on F1554? Is there any ACI or other code provisions that address this? If it is code-compliant and OK to use A615 all-thread rebar for anchor rods, are there any other negative things I should be aware of?
Thanks in advance.
Is this a common anchor rod spec the wind turbine industry? Is there any reason that I should reject the calcs and ask that they be based on F1554? Is there any ACI or other code provisions that address this? If it is code-compliant and OK to use A615 all-thread rebar for anchor rods, are there any other negative things I should be aware of?
Thanks in advance.






RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
Dik
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
Did the OP do a side by side comparison of the material properties - both mechanical and chemical to show that the steels are different?
We get this all the time when an ASTM spec is given and the contractor (we are in Asia) proposes a JIS (Japanese) or EN(European) grade instead. We then look at the steel properties - not the title of the particular "Standard."
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
Yes.
Jenny-
I don't think drawings and a spec calling for F1554 mean that you can't use threaded rebar. What I would do, however, is this. I would ask them why they want to deviate from the contract. You know it's about money, but get them to say it. The contract says F1554, so they bought F1554. Once they say it's the money, then ask how much of a credit the owner should expect back as a result of the change, if it can happen.
I'm sure they either 1) priced what they're proposing now or 2) priced the F1554, but can get what they're proposing cheaper. In either circumstance, they probably have no intention to credit the owner, unless you call them on it.
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
Dik
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
Use an all-thread rebar meeting A615 specs and provide at the edge with a 2" cover in epoxy and enough development length and voila, you have the full tensile capacity of the rebar.
Then you take an all-thread rod and epoxy it in 24" into concrete with a 6" edge distance and all hell breaks loose.
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?
I understand what you're saying, but please explain to me how you get a non-ductile failure of a rebar fully embedded and developed into concrete.
RE: All Thread A615 Rebars in Lieu of F1554 Anchor Rods?