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Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

(OP)
What alternatives are there for adding horizontal reinforcing to unreinforced masonry? Through bolting steel plates, epoxy anchoring steel plate to one side?

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Is it just shear capacity that you're looking for? If there are ungrouted cells available, you could have them grouted.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

(OP)
I'm just looking for the minimum reinforcement per ASCE 7-10 that prevents using unreinforced masonry in seismic design category C.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Horizontal Slot along a joint- insert rebar- and grout.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

(OP)
So just cut it out deep enough to place the bar in and grout it out? Pretty nifty thanks!

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

You'll want to keep an eye on a few things:

1) When the cuts are made, any axial stress present in the wall will migrate to the rear face shells. It usually works.

2) When the repairs are complete, the stresses will be different from those typically assumed in a non-repaired wall. Some of the stresses from #1 will be locked in.

2) For the duration of time during which the new bars are being installed, you've got a hinge mechanism within your wall. I've provided temporary lateral bracing for this reason in the past.

Out of curiosity, why is FRP off the table? That would have been my first choice.

Do you require a minimum amount of vertical reinforcing as well?

If capacity isn't a problem and the only issue is code compliance, I'd try to find some non-invasive way to solve the problem. Maybe attempt to justify satisfactory performance and seek a variance etc.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

(OP)
FRP isn't off the table. I wanted to know options so that I could give the contractor options because they "felt it was expensive". Once they got the options however they realized that they would not benefit from trying to have the other options designed, expedited through fabrication and installed. I don't always like to tell people "do it because I said so" I like to SHOW them that there was a reason that i specified it the way I did. I was looking for a kind of sanity check to make sure I wasn't missing something when giving the other options.

@KootK Thanks for the extra considerations. I add things like this to my mental locker so that in the future I have a more knowledgeable and thorough process when analyzing and designing.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Glad to hear about FRP remaining on the table. I had some qualms about the external steel reinforcing option. The whole point would be to make the masonry more ductile. I question how ductile the final product would have been if the steel reinforcing were fastened the block with fasteners that would themselves fail in a brittle fashion.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Quote (KootK)

Glad to hear about FRP remaining on the table. I had some qualms about the external steel reinforcing option. The whole point would be to make the masonry more ductile. I question how ductile the final product would have been if the steel reinforcing were fastened the block with fasteners that would themselves fail in a brittle fashion.

Depending on how it is designed and detailed, FRP can be woefully non-ductile.

RE: Alternatives to FRP horizontal reinforcing in Unreinforced Masonry

Quote (Depending on how it is designed and detailed, FRP can be woefully non-ductile.)


Agreed.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

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