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Overhead concrete with post-installed anchors

Overhead concrete with post-installed anchors

Overhead concrete with post-installed anchors

(OP)
Should all overhead installations of post-installed anchors be considered cracked concrete?

My understanding has always been yes, but I cannot locate the source of this. Per ACI 318-08 appendix D (D5.2.6, D5.3.6, and D5.2.7), concrete can be considered uncracked where indicated by analysis. Thus, the above statement would not always be true.

While I think it would be best engineering judgment to assume cracked concrete. "Others" are disagreeing with me and want to use a not approved for cracked concrete anchor for an overhead application.

Does anyone have solid documentation one way or the other? In searching and re-reading previous posts it seems the consensus is to always assume cracked, but the "others" will not accept this so I need some good documentation.

Thank you.

RE: Overhead concrete with post-installed anchors

Check out this link: Hilti pdf document link

It discusses cracked concrete a bit.

Also - in most concrete beams/slabs, under seismic loading you can get some pretty wild moment variations where typical gravity compression areas might go into tension.

RE: Overhead concrete with post-installed anchors

True JAE. There is a lot of tension in the gravity of some situations.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: Overhead concrete with post-installed anchors

Heh

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