Need a book? Engineering books recommendations...

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

RE: Wood Moment Frame in historical building - retrofit

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Hi Jian, hope you are doing good.

Use R= 2.8 in 97UBC. It should be classified as a Braced Frame where bracing
carries gravity load - Heavy Timber - Bearing Wall system. From table 16-N
of 97 UBC its system 1.4.c

If you can't get each bay to work, try making a diaphragm at the bottom
chord of the truss using rods so you can either retrofit a select few bays
or maybe take the load all the way to the exterior walls where you could do
some shearwall or frame.

Are you designing to UCBC or UBC ?

good luck
-gerard

-----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




_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ******** 

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ********