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RE: Wood Moment Frame in historical building - retrofit

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Prior to any design, make sure to inspect the trusses if you haven't
already. There are documented failures of bow string trusses. See the
following Web page for more info:

http://www.claimsmag.com/issues/june00/vintage.asp

-----Original Message-----
From: jian zhou [mailto:jiz290(--nospam--at)hotmail.com]
Sent: Thursday, October 04, 2001 8:56 PM
To: seaint(--nospam--at)seaint.org
Subject: Wood Moment Frame in historical building - retrofit


We are currently working on a project for retrofiting a historical building
The buliding is wood-framed structure with bow string truss (120' span).
The building is 120'x200'x50' high with knee bracings at both ends.
The trusses are supported by large timber section columns (3-6x12),
There is no shear wall existed along the truss direction and wood bracing
is provided as lateral support in the perpendicular direction.

Based on UBC, wood moment frame system is not allowed
(even though the column is very heavy and the building looks very good along
truss direction?). Could somebody having similar experience give some input 
on how to retrofit moment-resisting connection instead of adding shearwall 
or using other options, Right now it is not possible to add shear wall or 
bracing along the truss direction.

Thanks very much.

JZ




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