During a recent inspection of sprinkler piping I question the engineer for the use of Drop-In anchors in a seismic C design. These are the anchors you pre drill a hole in concrete and install using a threaded rod for support. Per Hilti ICC-ES report the anchors are not approved for seismic or use in cracked concrete. I understand the seismic bracing (1" pipe) and anchors are different however it is installed as a system and the bracing does not provide support.
Question 1 to engineer- Does the anchor meet ACI 355.2 Appendix D which comes from the IBC concrete anchorage chapter 17. His reply was not required to meet ACI 355.2 because of seismic C.
My next question #2- to him was because of sprinkler piping the Ip is 1.5 would this not make a difference. His reply the Ip would not change anything.
I'm not sure if I believe his answers. All fire protection engineers allow the use of drop in anchors, I have several jobs in a seismic D as well but all engineers disagree with me on the anchors.
#3- I am under the impression all concrete is cracked concrete unless design not to be. Most of my jobs are not structural slabs 2.1 wire in most cases.
Seismic Anchorage
Re: Seismic Anchorage
