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# Re: Shear friction methods in masonry

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Shear friction methods in masonry
• From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
• Date: Thu, 24 Feb 2005 04:23:52 -0500 (EST)

```Joe,

I did not find anything in my masonry textbook nor in the code.

I would, however, believe that shear friction would be potentially
applicable.  The same basic principles should apply in masonry as they do
in reinforced concrete (i.e. the bar hold the two surfaces together such
that friction can develop).  So, I would think that you could apply the
same basic methodology from R/C to reinforced masonry, except that the
"numbers" (i.e. the coefficients/factors) might be a little different.
After all, strength design for masonry (in the 2002 MSJC at least) is
basically identical to that of R/C except the factors change a little (you
use 0.80*f'm rather than 0.85*f'c and the beta1 value is constant at 0.80
for masonry while it can vary based upon f'c for R/C...and of course the
phi factor will be different since ACI 318 went to the "unified method).

If I can find anything else, I will let you know.

Scott

On Wed, 23 Feb 2005, Joseph  Grill wrote:

> Scott,
> Thank you very much for your time and effort.  I can't find anything in any
> of my publications.  I'm sure is shear friction working, but to quantify I'm
> not so sure.  I have considered the equations from ACI since it seems that
> if the reinforcing is developed each side of the shear friction plane that
> it would work, although the friction values and modifiers for lightweight
> concrete is the question at hand.  I think that using the values for "all
> lightweight concrete" might get things closer.  I don't need the shear
> friction method entirely for the fix, but it would produce a real nice
> "belts and suspenders" situation for what I am doing which is making a
> composite masonry wall when one wythe is already in place.  I can cut face
> shells at certain spacings to give grout flow between the wythes to produce
> the "headers" as called for in ACI 530.  I was going to ask the contractor
> to provide bent bar dowels in these areas as an additional tie between the
> two wythes.  The dowels can provide additional shear tie for the composite
> section in a shear friction mode.
>
> Thanks again,
> Joe Grill
>
>
> ----- Original Message -----
> From: "Scott Maxwell" <smaxwell(--nospam--at)engin.umich.edu>
> To: "seaint" <seaint(--nospam--at)seaint.org>
> Sent: Wednesday, February 23, 2005 5:55 PM
> Subject: Re: Shear friction methods in masonry
>
>
> > Joe:
> >
> > I don't actively recall anything (could be a "senior moment" thougt), but
> > let me do a little "looksie" at my various publications and maybe even
> > ask a few "little birdies".
> >
> > Scott
> >
> >
> > On Wed, 23 Feb 2005, Joe Grill wrote:
> >
> >> Have any of you ever seen any literature for using shear friction methods
> >> in
> >> masonry?  I have a fix to try to put together for a contractor and
> >> thought
> >> this is one way to help the situation.
> >>
> >> Thanks,
> >>
> >> J. Grill
> >>
> >>
> >>
> >> Joseph R. Grill, P.E. (Structural)
> >>
> >> Shephard - Wesnitzer, Inc.
> >>
> >> Civil Engineering and Surveying
> >>
> >> 1146 W. Hwy 89A Suite B
> >>
> >> Sedona, AZ  86340
> >>
> >> PHONE (928) 282-1061
> >>
> >> FAX (928) 282-2058
> >>
> >> jgrill(--nospam--at)swiaz.com
> >>
> >>
> >>
> >>  <http://inet/index.htm>
> >>
> >>
> >>
> >>
> >
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