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Question about Moment of Inertia

  1. Jan 22, 2009 #1
    Hello, everyone, I am new here and was wondering if someone could help me out in regards to a figuring out the moment of inertia for a steel beam. It is 25 feet long and 4 inches wide. How think would this beam have to be before moment of inertia? Any help with this would be extremely grateful. Thanks for your time, Bob
  2. jcsd
  3. Jan 23, 2009 #2


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    The MOI is going to be a function of the cross section geometry. If you look at any supplier's catalog, they should list the MOI for each size they sell. In order to calculate that number, you need to know the height, web thickness and flange sizes as well.
  4. Jan 23, 2009 #3


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    nevil7b: What is the applied load, and type of room? And what is the distance between lateral supports for this I-beam?
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