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Re: AW: Boring through GLBs

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Don:
According to APA EWS S560F holes up to 1 1/2" dia. may
drilled in the location you describe if used for
access & not loaded. Perhaps you can download a copy
of this document (its free) to satisfy the building
inspector.
Irv
 
> I have a building I designed being constructed here
> in SoCal which has a
> clear-spanned GLB floor girder system about 35 feet
> long with 36? deep
> beams.  A few weeks ago I got a call from the GC
> telling me that the
> electrician, for reasons known only to the
> electrician, drilled a single 1
> ¼? diameter hole through the GLB to fish some
> conduit through to an elevator
> room.  After quizzing the GC about where the holes
> were, I found that they
> were bored about 10 feet from the point of support
> and near the center of
> the depth of the beam.  
> 
>  
> 
> I was a bit miffed that it happened, but figured a
> hole that small in the
> center 1/3 of the depth of the beam away from the
> area of max moment wasn?t
> going to be a big deal.  
> 
>  
> 
> Well, my engineer was extremely upset about it and
> threatened to make them
> replace the beam. He finally agreed to approve it
> but I could not get any
> impression out of him whether it really was a big
> deal structurally or if he
> was just putting on a show to teach the GC a well
> deserved lesson.
> Meanwhile, the building inspector gets into the act
> and is asking for a
> letter from the manufacturer approving the holes, an
> idea I found very odd.
> 
>  
> 
> My question:   What?s going on here?  What do I not
> know, after all these
> years in the biz, about holes in GLBs?  From a
> reduced section standpoint,
> away from the point of max moment and near the
> center of depth, such a small
> hole seems relatively unimportant to me. Am I
> missing something?
> 
>  
> 
> -DB
> 
> 




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