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RE: Redundancy/Reliablity Factor (ro) in Wood Frame BLDG

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The following link is the seaoc paper on Rho:
There is no mention of not applying the Rho factor to wood framed bldgs. And it does not make any sense not to. If a structure lacks redundancy, it's a negative attribute whether it is wood framed or any other system. 
However, SEAOC proposed eliminating the penalty factor of 10/Lw for wood framed buildings.
Ben Yousefi, SE
Santa Monica, CA


From: Casey K. Hemmatyar [mailto:khemmatyar(--nospam--at)]
Sent: Thu 9/21/2006 5:59 AM
To: seaint(--nospam--at)
Subject: Redundancy/Reliablity Factor (ro) in Wood Frame BLDG

Dear List members:


There are some "Plan Examiners" that have been requiring computation of Redundancy/Reliability Factor (ro) in Wood Frame BLDG. 

My understanding is that the SEOASC has issued a white paper in this regard and does not require the need for this in light wood frame structures. 

1- What has been your experience with Redundancy/Reliability Factor when designing a wood frame building? 

   (would you still provide the "Plan Examiner" with "ro" computation?)

2- And how does this relates with IBC 2003 requirement?



Casey (Khashayar) Hemmatyar, PE

Southern California