Analysis Of Girder Fatigue Strength And Investigation Of Wheel Shaft Loads In C-Type Gantry Cranes

Portal cranes are industrial lifting and transportation machines designed to move loads in horizontal and vertical planes in open areas. C-type portal crane is a crane that features a symmetrical axial design and is structurally characterized by the offsetting of the girder construction from the legs by a certain distance. This offset causes the side view, to resemble the letter "C”. Depending on the load-carrying capacity, geometry and volume, C-type portal cranes are optimized with a structural design that allows loads to be positioned without contacting the C-type legs. This distinctive feature enables the safe and secure transportation of loads of various sizes and shapes in a wide range of industrial applications.

In this study, the fatigue strength calculations of the girder and wheel shaft, which are key components of a C-type portal crane, were analyzed analytically within the scope of the DIN EN 13001 standard. Stress values occurring in the girder and wheel loads were obtained using the finite element method (FEM) as part of the design process for the C-type portal crane. Considering the stress values on the wheel shaft, the fatigue limits of these components were calculated according to the draft version of the "DIN EN 13001-3-8: Shafts" standard, published in 2021. For the girder construction, fatigue limits were determined from the tables provided in the EN 13001-3-1+A1 standard and compared with the design stresses. The obtained results were analyzed in accordance with the reference past stress parameter (Sn) in order to examine the safety of the beam weld areas and wheel shafts of the C-type gantry crane. It was determined that the girder and wheel shaft meet the safety criteria corresponding to the S6 class past stress parameter. These findings demonstrate that the design complies with the relevant standards and provides sufficient fatigue strength.