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In Wall flush beam ICF

In Wall flush beam ICF

In Wall flush beam ICF

(OP)
I am designing a 6 1/4 inch wide ICF wall beam with an 18 foot span.  I have 9 feet of wall between the top of wall and top of opening.  Since its an ICF wall I want to avoid shear stirrups if possible.  I'd like to place (2) #5 bars above the opening along with typical horizontal wall and vertical wall reinforcment with ZERO shear stirrups.  What depth (d) can I use in my phiVc calculations.  I think I can use the whole 9 feet if I needed to, however in the past (I do lots of tilt-up) I have always been conservative and placed a 2 foot deep reinforced beam with shear stirrups over my openings.  If the two foot deep assumption was OK without shear stirrups I excluded them.  If it wasn't then I would include them.

In either case this beam won't require lateral bracing.  I can't be the firt person to contemplate this?  I guess I'm having a bit of self doubt.  Am I missing anything here?

John Southard, M.S., P.E.
http://www.pdhlibrary.com

RE: In Wall flush beam ICF

The opening would have an arching action if you have adequate wall on either side of the opening.  If you had less wall on either side, then that would create a need for tension reinforcing at the bottom of the arch (top of the opening) to tie the arch together - developed past the opening width.

With 9 feet of wall, you could also look at it as a deep beam (see ACI 318, sections 10.7 and 11.7).

 

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