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RE: Existing wall/Fdns

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Is this a wood framed structure on a URM foundation? If it is I would
suggest designing a deadman type foundation to transfer shear through and
construct them as close to the perimeter foundations as possible. Create a
cripplewall thats properly sheared for each foundation in each line of shear
and in each direction and drag the floor diaphragm into these foundations.
This has become a fairly common standard for relieving the lateral load to a
urm foundation.
There are other methods, including gunniting the inside wythe of brick and
even inserting vertical anchors through the plates deep into the urm
foundation - but I perfer the deadman type foundation.


Dennis Wish PE

"Science may have found a cure for most evils; but it has found no remedy
for the worst of them all- the apathy of human beings."
Helen Keller

|-----Original Message-----
|From: T [mailto:vicpeng(--nospam--at)]
|Sent: Monday, March 16, 1998 5:14 PM
|To: seaoc
|Subject: Existing wall/Fdns
|I am assisting a structural engineer in the renovation/retrofit of an
|heritage that has existing un-reinforced foundation walls (3' to 5'
|high) and footings.  I am working at a distance so I have not
|inspected the site first hand.
|Excavation at site has "unearthed" serious horizontal (the usual
|ragged type) cold jointing in the pours done when the building was
|constructed.  The building in essentially a single storey with 45deg
|roof slopes and partial basement.
|Because the building must be brought up to some semblance of Code
|conformance we are considering adding "splints" across the cold joint
|in order to mitigate any separation of the parts under seismic
|conditions.  In truth one part of the wall  has already separated due
|to undermining during construction.
|Any ideas?
|Thor Tandy  P.Eng
|Victoria  BC