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  1. #1
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,677

    Default Beam or Bar joist reinforcement.

    I was at another site the other day and we had a discussion as to how to reinforce a beam, Barjoist or a tube that is laying in the horizontal position being used as a beam.

    The load being a verticle load pushing straight down from the top or being pulled straight down from the bottom.

    Wheather the load is a point load or a uniform load.

    My question is on an I shape or box shape what is the best way to reinforce this member.

    On a beam is it stronger to add steel to the top and bottom flange or is it stronger to add a plate of steel to the webb part of the beam.

    Or if the member was a box tube, is it stronger to plate the top and bottom flange or to plate the sides of the tube calling that part the webb.
    Last edited by Portable Welder; 02-22-2009 at 02:01 PM.

  2. #2
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    Not too sure about box tube. Iíve always been told by engineers that an S-shape will fail to one side or the other first, so adding plates to the top and bottom flange will strengthen an S-shape / I-beam.

  3. #3
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    Should have added this in the first post!
    Attached Images Attached Images

  4. #4
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,677

    Default

    Thanks for the picture sonora iron.

  5. #5
    Join Date
    Feb 2008
    Location
    North of Phila. PA
    Posts
    404

    Default

    You can strengthen a beam in 2 ways.

    1st, you can thicken the flanges as shown above. This increases the strength while not significantly increasing the height.


    2nd You can deepen the beam. Sometimes by building a T on top of the area of the greatest stress. This works for point loads mostly.

    A taller beam will weigh less than a thicker thinner height beam and support more weight. The key is that you separate the flange by a greater distance. I can't lay my hands on my steel table right now, or I'd give you a good example on how much strength gets added just by increasing the web height vs increasing the flange thickness.

  6. #6
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    I donít think so.
    Why will an H-beam / wide flange take more load than an S-shape?
    The width of the flanges.

    Example: (just a quick look, to find two beams close in size and weight)
    24 x 14 x 130# wide flange evenly loaded 15-feet span will take 294,000 pounds.
    24 x 7 7/8 x 120# I-beam evenly loaded 15-foot span will take 223,000 pounds.

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