Mark Watson wrote :
>
> I just had to jump into this topic. Not that I'm any kind of
> structural
> engineer but rather an electrical engineer who took (and pretty much
> enjoyed) the required mechanical courses many years ago. Since
> then, I too
> have "honed" my structural engineering "skills" with the various home
> improvement shows.
>
> My thoughts on strengthening the broken beam:
>
> Brian Kemp's cheap ASCII art modified:
>
> ------------------I--------- sisters 1a (long) and 1b (short)
> ------------x-------------- original broken board
> --------I------------------- sisters 2a (short) and 2b (long)
>
> The basic idea is to span the entire width of the garage with
> sistering
> beams on both sides of the broken beam. Since the 24' length
> apparently is
> not available, use two shorter sisters ( one 16' and one 8') on both sides
> of the broken beam staggering the joints between the sister beams.
Mark, what is the advantage of adding the two 8' sections ? The original
beam is not only sound, but already adequate in these areas, plus it's
already being doubled on one side. With new beams on either side of the
break, there are now two widths of lumber across the entire span. I don't
see the advantage to having 3 widths in the least stressed areas.
Randall - just got home with (4) 16' 4x6 and a big bag of bolts <g>
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