INFLUENCE OF GEOMETRIC DEVIATIONS ON THE STRESS-STRAIN STATE OF OVERBRIDGE AT TAILINGS THICKENER

Abstract

Introduction. The article presents the results of testing a developed methodology for assessing the effect of geometric deviations on the stress-strain state of the metal structures of an overbridge at the facility of «Tailings Thickener 1», located at the Natalka Mining Processing Plant. A brief review of previously performed studies for recording deviations of metal structures is provided, along with confirming the relevance of the problems solved in the article and the study in general. It was substantiated that it is necessary to adjust the previously developed project on the overbridge of a thickener (OT); the applicability of the developed methodology was demonstrated.Aim. In the article, the methodology for determining the stress-strain state of frame metal structures was tested in the light of deviations, using the example of an OT.Materials and methods. The following materials and methods were used:– the finite element method implemented in SCAD 11.5 was applied in the numerical study of the state of the (OT) having deviations;– the theory of dimensional chains and the method of geometric modeling implemented in the authoring software entitled the «Dimensional analysis of rod structures» Computational Complex were used to determine the values of geometric deviations.Results. The results presented in the article allowed for timely substantiation of the amendments of the documentation and an increase in the reliability and economic efficiency of the OT, as well as the entire facility. During research:– possible geometric deviations of the OT were forecasted, along with plotting the limiting values of possible geometric deviations of nodes in three directions (X, Y, Z);– effect of possible geometric deviations on the stress-strain state of the OT metal structures was included in its verification calculations, which substantiated the necessity of adjusting the project and optimizing previously made decisions;– values of permanent and temporary loads were reduced, which allowed the possible emergency situations at the facility to be avoided.Conclusions. The developed methodology for determining the stress-strain state of frame metal structures was validated on the example of an overbridge of a thickener, taking into account the accumulation of geometric deviations during its manufacture and installation.