Re: Redundancy R-factor and new math

The APA Testing Safety Factors have no specific correlation to code provisions that I am aware of, more of a generally accepted practice IIRC. Others can better explain that, but I believe it is to account for deviations in material properies, installation quality, and other difficult to predict situations that occur in field rather than in a lab.

As Harold stated, the R factor is based on a structural system's energy dissipation characteristics or non-linear behavior.

-g

On 7/23/07, Pinyon Engineering <Pinyonengineering@hughes.net> wrote:

It is the structural system factor or Global System and Overstrength factor
R that I am Refering to not rho
The 2.8 to 3.5 is the safety factors applied to the ultimate strenghts found
from the APA testing not the omega --
Tim Rudolph


******* ****** ******* ******** ******* ******* ******* ***
*   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@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
******* ****** ****** ****** ******* ****** ****** ********

--
-gm