Regulation of space grid structure stress-strain state

Abstract

By analysing publications and research, it is found that space grid structures, which are spatial rod lattice systems, are characterised by their effective static behaviour. The stress-strain state of construction structures, in particular slabs, can be significantly dependent on a number of factors: the shape of the base cell, the way it rests on the supports (walls, columns), the method of arrangement of support posts, and the thickness of the slab. As a conclusion from the research analysis, it can be stated that the research of one of these factors (force regulators), which affects the material capacity of the structure, is relevant. Finite element models of space grid structures are described, which differ in the arrangement of columns on which the structure is supported. The arrangement of columns is taken in three ways: columns are located at the corners of the slab; columns are located along two parallel sides of the slab; columns are displaced inside the slab 4.5 m on both sides. That is, the method of localization of the columns is the regulator of forces in the slab elements. The variants of column arrangement can be used to determine the most efficient model in terms of static behaviour. Consequently, this most efficient model will also be the least material-intensive, i.e. it will have the lowest possible weight. The most rational (efficient) model from the considered variants was determined. The efficiency was determined by the criterion of more rational stress-strain state. Selection of element cross-sections according to the first and second groups of limit states was carried out. The weight of each model was counted and the model characterised by the lowest material capacity was determined. According to the criterion of material capacity, the most efficient model of the space grid structure is the model No. 3, supported by 4 columns displaced inside the slab by 4.5 m.