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Shear Analysis of Wood Beam with Holes in Critical Shear Area

Shear Analysis of Wood Beam with Holes in Critical Shear Area

Shear Analysis of Wood Beam with Holes in Critical Shear Area

(OP)
I have a client that drilled 3 holes in the end of an LVL beam. The holes are along the neutral axis in the critical shear region, or within the 1/4 span of the beam. The beam is 3-1.5"x9.25" members, and the holes are each 1" in diameter. Would anyone know of the proper procedure to analyze the beam for shear, to see if it would be OK? I would like a book on this type of procedure if anyone knows of a good one.

RE: Shear Analysis of Wood Beam with Holes in Critical Shear Area

Yes, there is, I just ran across a similar circumstance a few months ago.  Cannot put my finger on the info right now, but will look, for it.

In the meantime, have you looked at the AITC?  

Mike McCann
McCann Engineering

RE: Shear Analysis of Wood Beam with Holes in Critical Shear Area

(OP)
Thanks for the reply.
I went to AITC, but only found recommendation to avoid sharp corners for holes and notches. No real info on how to check of the beam will be OK.
I am thinking I can find the shear stress through the area of the hole, just above the hole and just below the hole. If these values are within allowable limits, it should require no repair. If the stresses are beyond limits, I could design a shear plate or use a purchased plate to reinforce for horizontal shear. I guess I am looking for confirmation if this sounds reasonable, or if anyone knows of a "standard procedure" to follow.

RE: Shear Analysis of Wood Beam with Holes in Critical Shear Area

Try this:

www.aitc.org and search for Technical note #19 dated May 2002.  Might answer your questions.  It solved my problem.

Mike McCann
McCann Engineering

RE: Shear Analysis of Wood Beam with Holes in Critical Shear Area

If you have an LVL, instead of a glulam, you should contact the manufacturer.  The AITC Tech note is a good place to start, but if you have a propietary product like a Gang Lam or Micro Lam you want to contact the manufacaturer.

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