Operation of pre-stressed span beams of bridge cranes taking into account load combinations
DOI:
https://doi.org/10.15276/opu.1.65.2022.04Keywords:
bridge crane, stress-strain state, pre-stressed beams, deflections of the beamAbstract
The paper considers issues related to increasing the bearing capacity of span beams of bridge cranes by means of pre-stressing. It is known that the work of the span structure of the crane with pre-stressed beams takes place under the same conditions, modes and capacities as conventional cranes. The load-bearing capacity of their span structures must be provided with high strength and rigidity in two planes – the main vertical plane and the horizontal one. However, studies of the stress-strain state of the crane with a pre-stress bridge operating in the horizontal plane were not performed. The peculiarity of this question is the development of a new mathematical model of the pre-stressed main beam, as well as obtaining the equation of the deflection curve of this beam when working in a horizontal plane. An analysis of its stress-strain state in the plane of the load suspension, as well as the simultaneous action of vertical and horizontal forces. This analysis allowed establishing the effect of horizontal inertial loads on the deformed state of the pre-stressed bridge. It is established that when operating a bridge crane with cargo in the middle of the span, the deflections of the span beam do not go beyond the regulatory deflections of a conventional crane bridge, which has a positive effect on the deformed condition of the main beam and facilitates the crane as a whole. The results obtained in this work can be further used for the design of bridge cranes with pre-stressed span beams in order to increase their load capacity, extend their service life without dismantling. Also for improvement of operating designs and engineering means of calculation, both at design stages, and in the conditions of real operation.
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