Buckling of plate with longitudinal rib

The paper considers the challenging issue of requirement strengthening for both the specific amount of metal per structure of the lifting facilities and applying high-tension steel. The elasticity theory methods used to solve the buckling problems of the structures with ribs result in extremely cumbersome dependencies. It should be taken into account that the crane structure elements can take up various combinations of loads during a single cycle of operation. Nowadays there are no analytical methods, which can solve these problems in respect to the lifting facilities. It should be noted that the formulae for calculating the buckling stress of the individual plates given in ISO, EN, FEM , etc. have a rather simplified and approximated nature. They cannot count the plate strengthening ribs. The paper describes the plates with a single two-sided rib, symmetrical to the middle plane of the plate. The authors suggest an appropriate approach to calculating the integral buckling of the plate with a rib. While using the proposed approaches, it becomes possible to estimate the optimal rib size. Further increase in size results in both the excessive consumption of metal and the structure heaviness.

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