Studies of a cylindrical mesh shell using the method of decomposition into flat faces and the LIRA application software package have been carried out. The assessment of the possibility of using the considered approaches in the analysis of specific sites and in the case of a complete study of the mesh surface is carried out. The necessary indicators of inclusion in the work of the design, reliability, accuracy and speed of calculation of design parameters are determined. The characteristics of the stress-strain state of the system are revealed, which made it possible to recommend an approximate calculation method for quickly determining preliminary results. Methods of obtaining calculated data in all zones of the shell on a cylindrical surface are analyzed. With the help of application software, a high degree of information about the forces, displacements and mass of the spatial structure was obtained. The simplicity and clarity of visualization of the obtained schemes in accordance with the design requirements are noted.

Keywords: cylindrical mesh shell, approximate method, computer approach, calculated parameters, forces, displacements, mass

The article discusses the statistical analysis of the stresses and displacements obtained which are determined by conducting physical experimental studies and are based on the developed calculation methodology. Due to the fact that the model was tested in laboratory conditions, the scale factor was taken into account and the coupling equations for the transition from the model to nature were compiled. The degree of discrepancy between the actual and calculated values of loads is taken into account and the characteristics necessary for statistical analysis are determined. The relations of stresses and displacements are given, taking into account the inaccuracy of the calculation, deviations of internal force factors and errors in the rigidity of the nodes. The inaccuracy in determining the geometric parameters and the modulus of elasticity of the material is justified. Sufficient reliability of the results was obtained taking into account the complex of all adverse factors.

Keywords: cylindrical mesh shell, statistical analysis of results, stress, displacement, deviation

The work of a metal cylindrical mesh shell with support ribs of increased rigidity is investigated. The rational variant of the profile of longitudinal elements is determined and the recommended parameters of the cross-section of the rods in the place of strengthening of the lower faces are proposed. Several approaches to circuit design were tested and cross-sections were calculated for three blocks of design solutions. It is recommended to use the I-beam profile as the optimal option to increase the coefficient of stability of the structure. Due to the increased rigidity of the support ribs, a significant unloading of dangerous areas was obtained and the form of possible deformation of the system was reconstructed. Qualitative regularities of distribution of longitudinal forces and displacements reflecting positive changes of the general state of the grid surface are revealed. The obtained numerical values of the calculated parameters showed the presence of reserves of the bearing capacity of the structure.

Keywords: cylindrical mesh shell, roof, reinforcement, stiffness of supporting ribs, force factor, deformation parameter

The influence of changes in the geometry of a metallic cylindrical mesh shell without reinforcements, with puffs and with horizontal trusses on the specific weight index is investigated. The span and the angle of the circumscribed circle of the shell are taken as the given parameters. They determined changes in the radius of curvature, height, cell size, shell length and stiffness characteristics of the rods. To determine the required specific gravity parameter, the number of elements was distributed by standard sizes. The calculations were performed using the application software PC LIRA. The obtained data were analyzed, as a result of which the optimal distance between the supports was determined, which made it possible to find the minimum mass and establish acceptable geometric parameters of the structure. In addition, extreme values were determined, beyond which the study of the influence of changes in geometric parameters on the specific weight index becomes impractical.

Keywords: cylindrical mesh shell, element of reinforcement, geometrical parameter, specific weight index, element of tension, horizontal trusse