O86 Built up beam Moment Capacity

[murphy89]

Hello,

I am working through a spreadsheet written a number of years ago (probably early 2000's) by another engineer that calculates the number of plies of various lumber sizes to satisfy load, span, and bearing length criteria that I input.

One section of their spreadsheet under a title they call "Load Sharing" applies a factor of 0.9090909090 to the moment capacity of a built-up beam if there are 3 or more plies in the beam. I can't find any reference to this in my O86-2010. Is this something that used to be in the O86 code and no longer exists? Does anyone know?

Thanks!

 

[jayrod12]

Without seeing how it is specifically applied in the formula, it sounds like they're dividing by the system factor Kh of 1.1 for built-up beams. See Table 6.4.4 (that's in the O86-14 but I feel it's likely similar in the 2010). 1/1.1=0.9090909.

 

[murphy89]

OMG, yes! that's exactly what it is. Thank you!