Statics problem
Statics problem
(OP)
Basic statics question: If I have an object hanging cantilevered from an I-beam, how do I find the bending stress part way up the I-beam (see attached sketch)? I know that my basic equation will be sigma = Mc/I. The moment at the lower end of the beam, M’ = W*L, but I cannot just move this moment to the location I am trying to take my section cut, right? Using what I remember from shear and moment diagrams, is the moment simply W*L at the one end of the beam and then zero at the other, and varies linearly in between? If that is the case, finding the moment acting on the section that I would like to analyze would be easy… but maybe I am missing something?





RE: Statics problem
If the beam was built in at one end and cantilevered out the bending moment would be constant along its length and equal to W x L, however in your sketch its on crane slings so the whole beam will try to rotate from right to left creating tension in the slings.
RE: Statics problem
RE: Statics problem
This does seem a bad situation for load lifting.
Regards,
Stefano
RE: Statics problem
RE: Statics problem
RE: Statics problem
once you know the line of action of things, you can figure out the moment at the section required (how far is the section centroid displaced from the line of action).
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