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crane / curved beam

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The best, easiest and safest way in dealing with a curved steel beam is to use a box section. Note that the governing internal force for a curved beam will be the torsion.
It is nearly impossible to obtain an acceptable stress or displacement value in curved configuration by using a "I" shape section only.
Note also that using a box section enables you to deal with out of plane reactions such as seismic or bracking forces.

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