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Re: Cutting GLB's

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AITC 117 gives the laminations required for a 24F-V4 GLB.  A 24F-V4 GLB is 
DF/DF, i.e., all DF (if you are using western woods).

The grades run from L1 in the outer tension zone to L3 in the core to L2D in 
the outer compression zone.  For a GLB > 15" deep:  On the tension side, 10% 
of the laminations are in the outer tension zone, 10% in the inner tension 
zone; on the compression side, 10% are in the outer compression zone, 10% are 
in the inner compression zone, and the rest are in the core.

Oh, L# grading --- you'll have to check the WWPA or WCLIB grading manuals for 
the properties of these laminating grades.

Unless the GLB is very deep, cutting 6" destroys the special (302) tension 
laminations.  The beam would have to be more than 60" deep for any of the 
outer tension laminations to remain.  Horizontal (flexural) shear will have 
to be investigated where the depth of the section changes and I can assure 
you that that is no easy task.


A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Pat Clark wrote:

. > He is proposing to cut a long tapering arch, say 8' long, by only 6" in
. > height.  We will add to the beam size to provide whatever additional 
. > strength would be required.  

. > Pat Clark

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