Methods of creating prestress in span structures and features of their calculation.
DOI:
https://doi.org/10.15276/opu.2.70.2024.02Keywords:
prestress, initial curvature, bearing capacity, crane bridge, static stiffness, deformation stateAbstract
The topic of the work is related to the possibility of investigating the influence of the curvature of a prestressed crane bridge on its bearing capacity. In the work, the authors propose a new structural-technological solution for prestressing the crane bridge, which allows avoiding the main shortcomings inherent in the currently used structures. The proposed design also avoids the constant stress-deformed state of the beam, where the magnitude of the unloading moment depends on the magnitude of the working load. For a positive consideration of the given task, there is a need to obtain an exact equation of the crane bridge deflection curve. Such a task requires the development of a new mathematical model, as well as the development and refinement of already existing mathematical models of preformed beam systems. This is the purpose of this work. The paper proposes a new mathematical model based on the general theory of stability of elastic systems. During its development, the real conditions of the construction of the crane bridge were taken into account. The universal equations of the deflection curve of the beam with the initial curvature are obtained, which make it possible to investigate its stress-strain behavior under the simultaneous action of loads on the beam in the plane of the suspension of the load simultaneously with an axial eccentric load. The results obtained in this work can be taken into account when determining the geometric characteristics of beam sections, as well as for improving the calculation methods for the design of span beam systems at the stages of their design, as well as in real operation conditions. In addition, the recommendations given by the authors can be applied in the repair of crane bridges, their modernization in order to increase the load capacity, as well as increase the service life of the lifting machine without dismantling.
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