Question about Moment of Inertia

AI Thread Summary
To determine the moment of inertia (MOI) for a steel beam, the cross-sectional geometry is crucial, including dimensions like height, web thickness, and flange sizes. Supplier catalogs typically provide MOI values for various beam sizes. Additional factors such as the applied load, room type, and distance between lateral supports also influence the calculations. Accurate MOI calculations require comprehensive beam specifications. Understanding these parameters is essential for proper beam design and application.
nevil7b
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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
 
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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.
 
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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