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RE: Shear Friction
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 Subject: RE: Shear Friction
 From: "Jake Watson" <jwatson(nospamat)utahisp.com>
 Date: Fri, 15 Nov 2002 07:04:55 0700
The
precast guys gave us an article that explained where the shearfriction
equations came from. I can't seem to find it at the moment, but it had and
interesting point. If you demand is low, (say 12 sqrt(f`c) ), then the
concrete helps as much as the steel and you get very high capacities per
bar. In other words, at the low end you don't need much steel as ACI318
will tell you. The equations in ACI 318 are for when you have high shear
stress (say 810 sqrt(f`c) ). At this point, only the steel is effective
and you get next to no help from the concrete (it has already failed).
This is the case modeled in ACI. I will have a look and see if I can find
the article later today. So if you are in the low end, I wouldn't be that
worried about the steel development. I would take the reduction like you
mentioned and let it be.
Jake
Watson, P.E.
Salt
Lake City, UT

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