I gather from what you have descibed that the notch effect is really on
the top, as you are saying that the "bottom of the PSL is blocked to the
bottom flange". I can't comment on what your codes require, but the
Canadian wood code is mostly concerned with notches in the bottom
portion of the beam or joist. If you have bottom bearing, then it may
not be a big concern, but perhaps some other lister familiar with the US
requirements can comment.
About a year ago, I was requested to look at a building approx 40 years
old that had wood roof trusses with the bottom chord on one end extended
approx 8"-12" so that it acted as a short cantilever. Some of these had
been notched on the bottom and almost all of them had cracks starting at
the notch and extending past the top chord-bottom chord intersection. I
told the Owner they were a real problem and he said leave it with
him-never heard from him. I think I would probably have had the
pertinent trusses jacked up and screws inserted in to the split pieces
from the bottom, and also I would have nailed on new lumber on each side
of the bottom chord.
Gary
IRV FRUCHTMAN wrote:
> Dear Fellow Engineers,
> On an ongoing renovation project I observed the
> following framing detail:
>
> A 12" deep PSL beam is supported by a W12-72 I-beam,
> with the top of the PSL some 7" above the top of the
> I-beam. The builder notched the end of the PSL to
> "fit" past the top flange (plus 2by nailer) and extend
> to the web of the I-beam. The notch is about 7" from
> the top of the PSL and 2" wide and 6" long. The bottom
> of the PSL is blocked to the bottom flange.
>
> I calculate that PSL shear stress is about twice the
> allowed by assuming the notch extends to the bottom of
> the beam.
>
> Before I advise the owner to replace the PSLs (there
> are 4) am I missing something or is there is a way to
> reinforce them?
>
> TIA,
> Irv
>
>
>
>
> ____________________________________________________________________________________Ready for the edge of your seat?
> Check out tonight's top picks on Yahoo! TV.
> http://tv.yahoo.com/
>
> ******* ****** ******* ******** ******* ******* ******* ***
> * Read list FAQ at: http://www.seaint.org/list_FAQ.asp
> *
> * This email was sent to you via Structural Engineers
> * Association of Southern California (SEAOSC) server. To
> * subscribe (no fee) or UnSubscribe, please go to:
> *
> *
http://www.seaint.org/sealist1.asp
> *
> * Questions to seaint-ad@seaint.org. Remember, any email you
> * send to the list is public domain and may be re-posted
> * without your permission. Make sure you visit our web
> * site at: http://www.seaint.org
> ******* ****** ****** ****** ******* ****** ****** ********
>
>
******* ****** ******* ******** ******* ******* ******* ***
* Read list FAQ at: http://www.seaint.org/list_FAQ.asp
*
* This email was sent to you via Structural Engineers
* Association of Southern California (SEAOSC) server. To
* subscribe (no fee) or UnSubscribe, please go to:
*
*
http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad@seaint.org. Remember, any email you
* send to the list is public domain and may be re-posted
* without your permission. Make sure you visit our web
* site at: http://www.seaint.org
******* ****** ****** ****** ******* ****** ****** ********