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RE: [AEC-Residential] Hillside primary anchors

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The following message was forwarded to the AEC-Residential Listservice by
Paul Franceschi S.E. Paul wrote:
"the use of tension only braced frames is discouraged by the code, due to
poor observed performance during the Northridge earthquake.  however, drag
connections to shear walls and foundations are typically tension only type
connections.

how steep does the angle need to be on a drag member for it to no longer be
considered a drag member, and suddenly become a tension only brace?  I have
hillside condition where the floor is 3' above the uphill foundation and 10
feet above the downhill foundation, with the two lines spaced 26 feet apart.
the architectural requirement is that the sides parallel to the downhill be
open.  a concentric frame could be installed but brace angles would be
significantly different and connections would be difficult to make.   a
diagonal member installed between the two ends connected to the uphill
foundation would act as a drag to the foundation and not induce bending in
any member.

thanks in advance for any comments on this matter.

Paul Franceschi s.e."

Paul faxed me a further description and a sketch of the situation which I
have posted on the Structuralist.Net Professional Forum in the "Code
Interpretation" section. If you are interested in review Paul's problem and
offering some suggestions, please follow the link shown below.

IMPORTANT: THE LINK WILL NOT WORK UNLESS ALL CHARACTERS OCCUR ON ONE LINE
WITHOUT A LINE BREAK. THE LINK SHOULD START WITH HTTP: AND END WITH
&SID=3397 - IT MUST BE COPIED TO YOUR BROWSER WITHOUT SPACES OR LINE BREAKS.
ALTHOUGH ANYONE CAN VIEW THE DISCUSSION MESSAGES, YOU MUST REGISTER WITH THE
FORUM (ALWAYS FREE) BEFORE REPLYING OR POSTING TO THE PROFESSIONAL FORUM -
THIS IS TO PREVENT UNSOLICITED SPAM AND ASSURE PROPER MODERATION OF THE
SITE.

http://www.structuralist.net/cgi-local/UltraBoard/UltraBoard.cgi?action=Read
&BID=51&TID=2&SID=3397

Regards,
Dennis S. Wish, PE
The Structuralist Administrator for:
http://www.structuralist.net
AEC-Residential Listservice
admin(--nospam--at)structuralist.net
(208) 361-5447 E-Fax


-----Original Message-----
From: owner-aec-residential(--nospam--at)polhemus.cc
[mailto:owner-aec-residential(--nospam--at)polhemus.cc]On Behalf Of PFFEI(--nospam--at)aol.com
Sent: Thursday, October 19, 2000 9:21 AM
To: aec-residential(--nospam--at)polhemus.cc
Subject: [AEC-Residential] Fwd: hillside primary anchors