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RE: notching a steel beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: notching a steel beam
- From: "Carter, Charlie" <carter(--nospam--at)aisc.org>
- Date: Thu, 16 Sep 2004 08:51:51 -0500
>If you take away most of one side of a top flange of a steel beam,
>say an 8" flange and on one side you notch out 3", what are some
>acceptable methods of reinforcement? There will be a pipe going
>through the notch, and I cannot do anything from the top. Is welding
>a plate of sufficient area to the underneath of the opposite flange ok?
>I see how this will replace the section modulus and compressive block
>that I am losing, but I am concerned with how the internal stresses of
>the beam "jump" from one side to the other.
A lot depends upon the details of the slab (if there is a slab) and the location of the material removed. The interconnection to the slab may be enough to handle any out-of-plane effects that develop due to the asymmetry. On a short segment, it is most important to extend the reinforcement beyond the zone of the cut to allow for the redistribution that has to occur from the full cross-section to the reduced and back to the full. Two ways I can think of to do this:
My guess without running any numbers is that these will work out to similar values.
If there is nothing helping you to restrain the out-of-plane effects on the beam please let me know and fax me a sketch so we can see what else might need to be done.
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