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.
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
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
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Overhead concrete with post-installed anchors