Abstract
Influence of perforation on the lateral-torsional buckling of I-beams with plane and castellated web in elastic stage of loading was considered with help of the finite element method, which allow to analyze critical loads of castellated beams and beams with plane web. Calculations were performed for simply supported beams under uniformly distributed load and concentrated forces, applied symmetrically at different distances from supports. Numerical calculations were carried out with help of program complex ANSYS on specially elaborated program. For castellated beams under constant relative depth of openings there were varied such parameters as shape and step of openings. Performed comparison of results with existing in literature analytical calculations of beams with plane web allow to confirm accuracy of existing formulas.
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