Anchors: Threaded Rod vs. Headed Bolt
Anchors: Threaded Rod vs. Headed Bolt
(OP)
Definitions from ACI 318-14:
Anchor – Steel element either cast into concrete or post-installed into hardened concrete used to transmit loads
Cast in Anchor - is only a headed bolt, headed stud, or hooked bolt.
Post-Installed Anchor – expansion anchors, undercut anchors, adhesive anchors (including threaded rods)
Can I use a threaded rod with a nut for a cast-in-place application, or is the code telling me I can't??
I also found this from the "Handbook of Structural Engineering - Second Edition"...but all the references are ACI 318-02. I thought I could use threaded rods with nuts cast-in no problem.
Anchor – Steel element either cast into concrete or post-installed into hardened concrete used to transmit loads
Cast in Anchor - is only a headed bolt, headed stud, or hooked bolt.
Post-Installed Anchor – expansion anchors, undercut anchors, adhesive anchors (including threaded rods)
Can I use a threaded rod with a nut for a cast-in-place application, or is the code telling me I can't??
I also found this from the "Handbook of Structural Engineering - Second Edition"...but all the references are ACI 318-02. I thought I could use threaded rods with nuts cast-in no problem.






RE: Anchors: Threaded Rod vs. Headed Bolt
All the research I've seen has shown that threaded rods with nuts welded or otherwise fixed to prevent the rod backing out were just as strong as a headed bolt or stud of similar size. I wouldn't have any issues with substituting a threaded rod and nut for a headed bolt in my designs.
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Anchors: Threaded Rod vs. Headed Bolt
This is what sparked my research: http://www.portlandbolt.com/technical/faqs/headed-...
RE: Anchors: Threaded Rod vs. Headed Bolt
Though you probably want to find a more recent reference, my guess is you will find that it is allowed.
RE: Anchors: Threaded Rod vs. Headed Bolt
I have no problem using a smooth rod, threaded at each end for a short distance to accept a heavy hex nut, but personally never use a fully threaded rod.
RE: Anchors: Threaded Rod vs. Headed Bolt
All our drawings that go out that are cast in place are specified as a F1554 all thread rod with a heavy hex nut tack welded to the end as JoshPlum described. It definitely helps with pullout
RE: Anchors: Threaded Rod vs. Headed Bolt
RE: Anchors: Threaded Rod vs. Headed Bolt
CARunderscore, I agree.
RE: Anchors: Threaded Rod vs. Headed Bolt
RE: Anchors: Threaded Rod vs. Headed Bolt
headed stud - a steel anchor conforming to the requirements of AWS D1.1 and affixed to a plate or similar steel attachment by the stud arc welding process before casting, also referred to as a welded headed stud.
RE: Anchors: Threaded Rod vs. Headed Bolt
RE: Anchors: Threaded Rod vs. Headed Bolt
RE: Anchors: Threaded Rod vs. Headed Bolt
RE: Anchors: Threaded Rod vs. Headed Bolt