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- To: <aec-residential(--nospam--at)polhemus.cc>
- Subject: Perforated Shearwalls
- From: "Structuralist" <dennis.wish(--nospam--at)gte.net>
- Date: Sun, 3 Dec 2000 22:10:24 -0800
- Cc: "SEAINT Listservice" <seaint(--nospam--at)seaint.org>
It is my
understanding the the State of Oregon is on the verge of approving the use of
the Perforated Shearwall design criteria in their state building code. I
reviewed the minutes from the State of Oregon Department of Consumer and
Business Services - Building Codes Structures Board which I believe was from
June or August of this year. The November minutes indicated that the perforated
wall methodology had not yet been approved because of some objections from SEA
of Oregon that needed to be resolved. The minutes I read indicated that the
State BCSB was leaning to accept adopt the methodology based on what they
considered a tested and proven system backed by AF&PA.
interested in the opinions of others as I have some personal reservations on
perforated walls. My greatest concern is that the success of the system lies in
the adherence to detailing and quality of construction. In other words, a
perforated wall in which the sill plate is broken to accommodate plumbing or
electrical may, in my opinion, compromise the system. I do see it as an improvement to prescriptive methods
if NAHB and other builder organizations are willing to adopt it in place of the
current UBC 2320 in higher risk zones.
On the other
hand, when we are under so much pressure in design to accommodate wall stiffness
to diaphragm torsion, I would think that the perforated wall system would be
difficult to accommodate and work into the full-compliance design
Although Oregon has
every right to adopt any code or methodology they choose, I believe it would be
in the best interest of the engineering community to have some sort of
solidarity in this issue. Don't misunderstand, I am not against perforated walls
- in my opinion, the jury is still out on the issue until I understand what
information is missing for regions of higher risk.
I would be
interested in opinions?
Dennis S. Wish, PE
Structuralist Administrator for:
ICQ # 95561393