Chemical Anchor Bond Strength

[apd139]

Can anyone tell me where to find information on the allowable bond strength for chemical anchors to steel and/or concrete? None of the chemical anchor suppliers work with allowable number anymore and I cannot find appropriate methods to deriving allowable bond strengths. Thank you.

 

[WARose]

Bond (for anchorage) hasn’t been part of ACI’s code for quite some time. Appendix D [of ACI 318] now governs anchorage to concrete.

The obvious exception to this is adhesive anchors (like Hilti). Their allowable strengths are typically in their product manuals. (I think Hilti has some of that stuff on line.)

 

[TXStructural]

Hilti 2008 "Product Technical Guide" listed both allowable and ultimate, and the spread was 1:4 for HIT-RE 500 and HIT-HY 150 MAX, for "Bond/Concrete Capacity". (I am obviously simplifying here.) And this does consider concrete strength as well as rod type. I do not believe that you can separately quantify each bond interface because the anchor "system" is too complex. The performance will differ for concrete character, embedded rod material and shape, hole size, depth, and drill type, etc.

Just curious, why would you be working in allowable when the manufacturer and every code now uses ultimate?