Reply by JJohnston

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Posted on Advice on cloud lift arbor beam

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1622 posts in 3260 days

#1 posted 10-19-2012 03:20 AM

My engineering sense (yes, I am) tells me you should take the upper section of the beam all the way to the end, that you shouldn’t notch the end section like that right near the support. This is a “high shear” area, and the end piece seems likely to crack at the corner of the notch. Note that the section of end piece beyond the notch (on which the center section is sitting) is carrying all the weight of the center section (half per end); structurally, the portion of beam above the corner of the notch is doing very little.

Don’t do it like in the center of the 3 laminations, either. It’s the same situation as the outer ones, just upsidedown, and the crack will go toward the center of the span rather than toward the support.

In the last picture (first set), take the blue line to the end of the beam and delete the vertical joint intersecting it. The main section of beam goes all the way to the end, and the narrow lower section will act more like a cosmetic corbel.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

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