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Re: Mount Zion Hospital bldg Grant St, San Fran, Ca

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Rand,

Due to the poor nature of many URM walls (i.e. weathered brick, suspect mortar, missing grout, etc.) the rods are put in at an angle to provide better holding resistance.  You can see this in the recommendations for HILTI HY-20 with the rod angle  typically at 22.5 degrees.

Thomas Hunt, S.E.
ABS Consulting



"Rand Holtham, P.E." <rand(--nospam--at)sigmaengineers.com>

02/02/2005 06:58 AM

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Mount Zion Hospital bldg Grant St, San Fran, Ca





List,

I have some pictures of this building in San Fran. which has had an apparent
seismic upgrade (to what is  presumable an URM building) The retrofit
involves a tube steel grid applied to the face of the building. The grid is
fastened to the the masonry with bolts at 6' to 8' centers. The bolts are
angled downward into the wall with a hill side washer at each bolt where it
passes thru the tube steel. My question is why are the bolts sloped?

TIA,
Rand



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