Pull out tests for epoxied-anchor holdowns in hardened concrete

[farsfo]

Is there any reference in codes (CBC, ACI) or else indicating the percentage of anchors needing to be tested and the test loads for epoxy anchors in hardened concrete?

 

[Lion06]

There are no requirements, that I know of, for testing of epoxy anchors. I asked this of a Hilti rep recently (actually for what load to test an anchor to) and was told that testing is really up to the engineer with respect to number of anchors to test or load to test the anchors to.

 

[dcarr82775]

We had a project where the existing concrete was all lightweight. Hilti came out and performed a couple of tests (less than 5) and provided us with values to use in design.

 

[Ron]

PA...you're back! That's good.

As PA and dcarr noted, no requirement by code, but EOR sometimes requires it. Most manufacturers will do the testing or pay for the testing by a local lab. Have done same for Simpson.

Make sure that if a local lab does the testing that they understand how to test correctly.

 

[Lion06]

Thanks, Ron. Things have been going horribly for me lately, so it's good to have this place to take my mind off things occasionally.

 

[wannabeSE]

If it is for a California hospital, OSHPD has a Code Application Notice(CAN) for field testing post-installed anchors (

http://www.oshpd.ca.gov/FDD/Regulations/pinscans.html).

 

[Ron]

PA...bring us up to date in The Pub or the unmentionable.

 

[farsfo]

For California Hospitals, there is a reference in the 2010 CBC Section 1912.2 [OSHPD 2].

http://publicecodes.citation.com/st...st_b200v10_19_sec012_par003.htm?bu2=undefined

For residential projects, I guess I can still maintain the required test load equal to 1.25 the maximum design strength of the anchors. And rather than testing 100% of the anchors, I could request testing 25% to 50% of all the anchors. Any other thoughts?

 

[HSIII]

I have not heard of any "minimum" number of bolts to test. What I've usually seen is 2 test anchors in roadway decks just to prove that the contractor's "procedure" works. I've also seen, on the one parking structure anchor testing I was involved with, that a minimum of 10% was required by the engineer of record. Thus kind of repeating what PA had mentioned, it really is up to the engineer as to the required "minimum" number to test.

Depending on what you're doing the pull-out test for, and which state you're in, there may be some standards as to rate of loading, max load to test to, duration to hold the load, etc.

I know that around here, both RIDOT (Rhode Island DOT) and MADOT (Massachusetts DOT) have requirements, depending on loading scenario, what the max load is supposed to be, duration to hold load, etc. Both of these DOTs follow some form of ASTM E488 "Standard Test Methods for Strength of Anchors in Concrete and Masonry Elements".

I would say that as long as the ASTM is folowed somewhat, you can set your required load to whatever you feel comfortable with, for as many as it would take for you to feel confident that the anchors were installed correctly.

 

[hawkaz]

When they set up the testing apparatus, make sure that it is situated so it does not influence the shear cone of the concrete. The bearing pads, or legs, should be located far enough away from the anchor so they are outside the anticipated shear cone.