Uniform and point load on a beam
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Posted by: davidnz ® 11/18/2007, 08:35:24 Author Profile eMail author Edit

Imagine a steel I-beam supporting a uniform load and in addition a wall running across the beam at a particular point and adding a point load to the beam. How do I calculate the section modulus and moment of Inertia in order to determine the appropriate I-beam. This combination, whilst common, does not appear in the calculators in this excellent website. Kind regards David Evans David L Evans Ph D

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: Uniform and point load on a beam
: Uniform and point load on a beam -- davidnz	Post Reply	Top of thread	Forum

Posted by: bandit ® 11/19/2007, 08:06:03 Author Profile eMail author Edit

You have to think of the I-beam as 3 independent parts. The up & down flange and the mid steel bar. That way, you may calculate SM & MoI for each part and combine them afterwards. You can also do that in an Excell worksheet on your own (if you don't know how, do not hesitate to ask) or you can even draw the I-beam if you are an Autocad-or similar program- user and the program can provide you with such info.

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Diagram to illustrate question on Uniform and Point load on beam
: : Uniform and point load on a beam -- bandit	Post Reply	Top of thread	Forum

Posted by: davidnz ® 11/19/2007, 13:10:14 Author Profile eMail author Edit

Thank you for your reply but I am not sure that I communicated the problem sufficiently clearly. I have attached a diagram to show what I mean. I can calculate the deflections for each of the 2 loads along the beam but I then get stuck as I do not know which formula to use for the Moment calculations. I feel that I need a formula for the combination rather than 1 for each type of loading.   David L Evans Ph D

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