Hilti HY-20 into hollow CMU IBC approval
Hilti HY-20 into hollow CMU IBC approval
(OP)
I can't find an ICC report for Hilti HY-20 for use in hollow CMU block. Does anyone know if it is acceptable to use this anchor for a 2006 IBC structural application? If so, do you use the Hilti capacity data?
Does anyone know of any other epoxy anchors that can be used in hollow CMU block?
Does anyone know of any other epoxy anchors that can be used in hollow CMU block?






RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
JLNJ - I am reluctant to use an expansion type anchor because it is in a corrosive environment and they can't be relied on. If I can determine the capacity of a through bolt, it would work in this application.
kslee - That is why we have ICC-ES reports to independently test products per code requirements. However, I can't find a epoxy based product for anchoring to hollow CMU that has an ICC report.
RE: Hilti HY-20 into hollow CMU IBC approval
If I remember correctly, one of the manuf produced a manu full of mistakes. I guess you aware as well. That's the trap we have keep in mind.
RE: Hilti HY-20 into hollow CMU IBC approval
To answer your other question, Read Head anchoring has a similar product and I would imagine Powers does also.
RE: Hilti HY-20 into hollow CMU IBC approval
Hilti HY20 documents
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
You can always call Hilti if you don't want to look for it and they will send you the requested information ASAP.
RE: Hilti HY-20 into hollow CMU IBC approval
The report only covers unreinforced masonry (ie brick) with a minimum thickness of 13". It does not reference hollow CMU block.
I did call Hilti and have not received any response from their engineers.
RE: Hilti HY-20 into hollow CMU IBC approval
What is your need for install thru bolts on hollow CMU. I guess the face cell couldn't take much of load, combined with high uncertainties, does the application really makes sense?
RE: Hilti HY-20 into hollow CMU IBC approval
Your point is good and worth considering. Obviously connecting to un-grouted CMU will only support relatively small loads.
In my case, other options are more complicated, expensive, and less desirable. The Hilti technical guide indicates that a 1/2" HY 20 anchor into hollow concrete block has an allowable shear of 1230 lbs (with a safety factor of 4). My connection has 2 anchors to resist a maximum load of 500 lbs. So, I have a safety factor of 5 below the Hilti allowable load. Also, the anchors are through a ledger channel which will distribute load (ie redundancy).
On a side note, there are many times that non-structural components need to attach to un-grouted CMU. Back to my original question, do we need a ICC report for Masonry anchorages that are governed by the IBC?
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
RE: Hilti HY-20 into hollow CMU IBC approval
I use Hilti tables for allowable deisgn. The shear capacity values, I use just the way they are. But tension capapcity values, I divide by 6. Do not use the ultimate values. There is a factor of safety of 4 in-built in the allowable capacity values and an additional 6 makes it very safe. I have used these in IBC2003 and IBC2006 code jurisdictions. I have no problems so far and my company always liked this kind of safe approach to expansion anchors.
My suggestion is use expansion anchors with a high (ridiculous) safety factor of 10 in tension and you are good. Problems arise only when something fails. we as engineers always want to avoid problems. Again, this is how I have been doing and it worked.
RE: Hilti HY-20 into hollow CMU IBC approval
Prior to his call, I had already taken the approach described by priya above. I think SF=10 is excessive, but if you are well below the manufacturers reported allowables (which have a high safety factor) and the anchors are installed correctly (special inspection), I think that it is a good safe design.
Thanks to everyone for your responses.
RE: Hilti HY-20 into hollow CMU IBC approval
Safety factor of 24, not 10. For something with a 1000# ultimate you use an allowable of 24#? Must be some small loads!