Epoxy dowel & shear friction
Epoxy dowel & shear friction
(OP)
If rebar is developed on either side of the shear plane, one side being with epoxy that develops the rebar with the epoxy but not long enough to develop the rebar if it was in bond with concrete only, should you be able to use shear friction by ACI or be forced to the concrete breakout checks in Appendix D?






RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
http://129.69.59.201/bibliothek/festschr/eligeh.pd...
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
Just a thought...
Mike McCann
MMC Engineering
RE: Epoxy dowel & shear friction
Haynewp, I don't eliminate chemical anchors, especially for shear. But I think their marketing has been based on half truths, and I don't mind making that "large statement".
RE: Epoxy dowel & shear friction
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Epoxy dowel & shear friction
But anyway, assuming the epoxy is correctly installed and inspected, and does actually develop the bar, it still seems to me like blowouts by Appendix D could occur for short embedment lengths. But then I can't find where there are any minimum edge distances to preclude blowouts under the shear friction section which doesn't seem right either even when you are using the longer concrete bond development lengths.
RE: Epoxy dowel & shear friction
http://www.fischer.sg/PortalData/1/Resources/fixin...
RE: Epoxy dowel & shear friction
It is nowhere near as apparent to me as it is to you. I will print out the paper though on Monday and read it in depth as I have time.
That being said though, this would be an excellent opportunity for you to write a paper and submit it to Ron's new site for further peer discussion. Just a thought.
Cheers. Have a good weekend.
Mike McCann
MMC Engineering
RE: Epoxy dowel & shear friction
For the original question concerning shear friction with epoxy embedded reinforcing, I assume the equation used is Vn = Avffyμ. Wouldn't one use Appendix D and the manufactures evaluation reports to determine the tension capacity for the Avffy used in the shear friction equation.
RE: Epoxy dowel & shear friction
http://www.concrete.org/PUBS/JOURNALS/AbstractDeta...
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
DaveAtkins
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
RE: Epoxy dowel & shear friction
Appendix D offers a method to determine how well a post-installed anchor will resist forces. If the design considers all parts of the system and the load path is continuous and sufficient, the design would comply with the code.
RE: Epoxy dowel & shear friction
Are the short rebar embed lengths (as what is being provided by adhesive manufacturers) using epoxy to develop the bars accepted by Code through testing?
RE: Epoxy dowel & shear friction
http://www.icc-es.org/News/news-ac.shtml
Here are 2 reports that include rebar, oddly enough they appear to use Appendix D as part of the reports:
http://www.icc-es.org/Reports/pdf_files/ESR-2508.p...
http://www.icc-es.org/Reports/pdf_files/ESR-2322.p...
RE: Epoxy dowel & shear friction
That said, short embedments using chemical anchors are MINIMUMS. There is no reason to adhere unreasonably to a minimum when life safety and structural integrity are on the line. You do not want to be excessive, but think the entire anchorage through carefully - it is the job of an engineer to use engineering judgement, not just get away with a minimum number published by a manufacturer. Look at supporting data and testing, understand the issues, and make an engineering decision. There is very little economy in minimal design, when a slightly deeper embedment of a limited number of bars eliminates all concern. We frequently spend lots of hours researching and discussing, when a more robust design solves the problem and costs less.