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Standard calculation for through-rod in CMU block
3

Standard calculation for through-rod in CMU block

Standard calculation for through-rod in CMU block

(OP)
Greetings! First time poster here.

Does anyone know of any Standard that discusses calculation methods for thru-rods in hollow, filled, and/or solid CMU block walls for bearing combined shear and tension forces?

I looked at ACI-318 but didn't find any reference to CMU block. The application is for an evenly spaced line of threaded thru-rods along the height of an opening jamb, (being used to attach a wind-loaded rolling door to a CMU wall,) and I want to make sure the block won't break out to the nearest edge or cone through the block. There are large thick washers on the back face of the wall to distribute the load.

My only thought now is to ballpark for it by calculating as I would for Hilti expansion anchors with consideration for CMU block, setting the effective embedment depth to the total thickness of the block, and throwing a healthy FoS on it. But that doesn't work for hollow block, and if there's a more correct way to do it, I'd like to learn it.

Thanks in advance!

RE: Standard calculation for through-rod in CMU block

ACI 318 is for cast in place concrete (as I'm sure you noticed). ACI 530 is the masonry code.

This topic has come up several times, so see what you can dig up by searching. It's not explicitly covered in the codes.

RE: Standard calculation for through-rod in CMU block

(OP)
Thanks phamENG. I will try to get a copy of ACI 530.
I did look through the posts here for thru-rod info, but nobody really addressed acceptable calculation methodology (that I could find). I don't have a structural background, so it could be I was just missing something that everyone else is taking for granted.

RE: Standard calculation for through-rod in CMU block

What I gathered from the other such recent topics is there is not enough testing done yet on these types of connections so there isn't a codified method for checking thru-rod connections in either concrete or masonry.

My Personal Open Source Structural Applications:
https://github.com/buddyd16/Structural-Engineering

Open Source Structural GitHub Group:
https://github.com/open-struct-engineer

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