Adhesive Anchorage (ACI 318)
Adhesive Anchorage (ACI 318)
(OP)
On a current project, I specified Simpson AT-XP acrylic adhesive be used to anchor large silos to the concrete foundation. This product is approved for installation down to 14 degrees Fahrenheit. However, where we are, temperatures are already below this for extended periods so the contractor has requested to use Simpson AT acrylic which is approved down to 0 degrees Fahrenheit. This is where my question arises.
The AT-XP (originally specified) meets strength design provisions of ACI318 Appendix D. However, the AT (requested substitute) does not as it is only has ASD design methods listed. If the AT adhesive has sufficient capacity to anchor the silos to the base under service loading, would it be an approved substitute? Or should it automatically be rejected due to it not meeting strength design provisions?
The AT-XP (originally specified) meets strength design provisions of ACI318 Appendix D. However, the AT (requested substitute) does not as it is only has ASD design methods listed. If the AT adhesive has sufficient capacity to anchor the silos to the base under service loading, would it be an approved substitute? Or should it automatically be rejected due to it not meeting strength design provisions?






RE: Adhesive Anchorage (ACI 318)
Mike McCann, PE, SE (WA)
RE: Adhesive Anchorage (ACI 318)
Maine EIT, Civil/Structural.
RE: Adhesive Anchorage (ACI 318)
So you either see whether ACI Appendix D (i.e. ACI 318) applies to your project or not -
OR
You heat the area involved to get it above the thermal limit for AT-XP.
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RE: Adhesive Anchorage (ACI 318)
RE: Adhesive Anchorage (ACI 318)
JAE,
When you say "See whether ACI App. D applies to your project" were you thinking something specific may apply that would get me away from ACI App D? Perhaps that these are silos and non-building structures? I would like to get a real solid handle on this situation as it looks like we will have several more silo projects crossing our desks in 2015.
RE: Adhesive Anchorage (ACI 318)
Also - sometimes projects, as you say, are not within a jurisdiction, or there is no building authority reviewing the design as is typical of silos, rural areas, etc.
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RE: Adhesive Anchorage (ACI 318)
Learned some interesting stuff today and made a valuable contact for future use. Thanks again for the help!