Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: removing partition walls:

[Subject Prev][Subject Next][Thread Prev][Thread Next]
In Tom's example I would agree since most multiresidential structures were
designed and, as he indicated, gypsum was a qualified shear material. In
single family residences, I would recommend checking the connection above
and below before assuming it is not a shearwall - however, my experience
with inspections done after Northridge is that most single family dwellings
without a plan irregularity balanced their shear in the exterior walls -
more in keeping with Conventional framing standards.
A quick climb into the attic space can answer many of these questions.

Dennis Wish PE

|-----Original Message-----
|From: Tom Chiu [mailto:Tomchiu(--nospam--at)]
|Sent: Wednesday, March 11, 1998 7:10 PM
|To: seaoc(--nospam--at)
|Subject: Re: removing partition walls:
|John Buchanan wrote:
|> At 05:16 PM 3/11/98 -0800, Dennis Wish wrote:
|> >This is an interesting question because it assumes that the original
|> >structure was desiged with consideration to the interior partitions to
|> >resist shear. I would doubt that to be the case unless you can verify
|> >connection of the interior partition which was removed to check it's
|> >connection to both the foundation and roof (or floor diaphragm) above.
|> >My guess is that if the interior wall is gypsum or plaster, it was not
|> >considered in the lateral analysis - if one was even performed. I would
|> >assume that, if shear was checked, the shear transfers would occur at
|> >exterior partitions. Therefore, I might disregard the interior
partitions as
|> >being anthing but dampers for the diaphragm.
|> I would be carefull here. In the mid eighties I worked for a structural
|> engineering firm
|> in which gypsum shear walls were used quite a lot. especially in large
|> development
|> projects.
|Most of the subterranean parking structure with 3 or 4 story wood framed
|apartments that was built in the 80's, usually considered interior
|drywalls as shear walls, even for nonbearing interior walls. I would
|make sure that shear blocking do not exist before calling that wall as
|non-shear wall.  Some older houses (say before 70's) did not have any
|shear blockings at all, whether it's shear walls or non-shear walls,
|they only rely on toe nails of the joists to the top plate of the walls.
|Tom Chiu, SE