INFLUENCE OF ARRANGEMENT OF COLUMNS OF A SPACE GRID STRUCTURE ON ITS BEHAVIOR

Abstract

Based on the analysis of publications and studies on the use of metal spatial lattice structural coatings as a slab, it has been established that this type of structure is the most rational and is characterised by effective static behaviour and its performance. However, the stress-strain state of a structural structure can be influenced by certain factors: from the shape of the structural grid, the bearing conditions and the number of supports to the height of the structural slab and the nature of the forces applied. All these factors influence the final result of the selection of load-bearing element cross-sections and the final structural design. As a result, it can be argued that the study of one of these factors (force regulators), which affects the selection of cross-sections of load-bearing elements and, as a result, the overall material consumption of the structure, is relevant. The basis of the force regulator in the schemes of finite element models of structural coatings in LIRA-SAPR software was based on the method and number of arrangement of structural support elements, namely columns. The arrangement of the columns is accepted according to three options: columns located along the four corner supports of the lower belt; columns located along the lower belt with a step of 3 m and 6 m on two parallel sides of the structure; four supports shifted inside the structure by 4.5 m on both sides. The options for the location of the supports were used to determine the most efficient arrangement in terms of the static behaviour of the structure and, as a result, the least material-intensive. The efficiency was determined by the criterion of the rational stress-strain state. The cross-sections of the elements were selected according to the first and second groups of limit states. The weight of the structures was determined according to the schemes, taking into account the selection of cross-sections with maximum use according to the conditions of strength and stability. It was determined that, according to the material consumption criterion, model No. 3, based on 4 columns shifted inside the slab by 4.5 m, is effective.