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Beam web opening

Beam web opening

Beam web opening

I am doing a stability and proportioning check of an opening in a beam web.  The opening width to opening depth ratio is greater than is recommended.  If I was to place vertical plate stiffeners at some spacing o.c. in between the opening width, and welding it to the top and bottom flange of the beam, will this resolve the instability/proportioning check of the beam?  Thanks.

RE: Beam web opening


It will help if you provide more information.
What is the beam shape?
What is the shape and dimensions of the opening?
Where is the opening centerline located, both in the depth of the beam and along the span?

RE: Beam web opening

The beam is a W10x22.
There are (5) 4.5 inches dia. openings. at 6 inches o.c..
The first opening starts 1 ft. from one end.
The openings are centered to the depth of the beam.
The load on the beam is 0.63k/ft. total.

RE: Beam web opening


I wouldn't cut ANY holes in a light 10" steel beam.

RE: Beam web opening


AISC's publication "Design Guide 2: Design of Steel and Composite Beams with Web Openings" shows what openings need reinforcement and how to reinforce the web.    It seems the beam you described would need reinforcement because the diameter of the holes, their spacing, and their location close to the support exceed the maximum/minimum specified.

The publication is available at the AISC website

RE: Beam web opening

Dlew and CottageGuy,
Unfortunately, the existing beam has already beam cut.  So,
I detailed another beam underneath the existing beam to support the existing cut-out beam.  This will take care of the problem.  Thanks for your replies.

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