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OMF in otherwise wood shear wall system

OMF in otherwise wood shear wall system

OMF in otherwise wood shear wall system

(OP)
Variations of this discussion have occurred here before. My particular case falls within exceptions where I can use R=6.5 for shear walls and R=3.5 for the OMF (rather than 3.5 for everything). That makes me happy. I wanted to be sure I am reading exception 3 of 12.2.3.3 of ASCE 7-10 correct. If I proceed with this method do my diaphragms need to be designed for R=3.5 forces? I'm quite sure it does but speaking with other engineers I don't know any that actually do.

RE: OMF in otherwise wood shear wall system

Yes, if your diaphragm can be classified as flexible then you can design each line of resistance using its respective value of R. Diaphragm design uses the least value of R in that direction (3.5 for your case).

RE: OMF in otherwise wood shear wall system

Assuming your OMF and shear walls are two different lines of resistance, yes.
I'm also assuming you have a flexible diaphragm, 2 stories or less, and are Risk Category I or II.

You design the OMF with R=3.5
The shear wall with R=6.5
And the diaphragm with R=3.5

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