A numerical study of the survivability of the flange assembly is carried out upon reaching a critical load and in the presence of a defect in one of the design areas, taking into account the calculated values of the aerodynamic coefficients. An experiment is being carried out to determine the values of the wind load acting on the supporting legs of a metal tower. The calculation of the stressstrain state is performed using software system as SCAD Office and IDEA StatiCa 10.0. After calculating the forces in the core model of the structure, a threedimensional plate model of the assembly is formed and prepared for calculation. According to the results of the experiment, a graph was compiled with the values of aerodynamic coefficients, which were used in calculating the stressstrain state of the node. The analysis of the calculation results revealed that in the design (defectfree) state of the structure, the safety factor of the bearing units and elements is 35-40% (equivalent stresses were 165 MPa). If there is a defect in the metal structures of the belt in the region of the flange, the equivalent stresses increase to 247.6 MPa in the region of the cleavage (defective hole), thus, the margin in bearing capacity drops to 0.4%. As a result of the assessment of the survivability of the flange connection, it was revealed that the connection has a high potential survivability, in turn, the flange itself is able to work in the presence of some defects without reducing its bearing capacity to a critical level. The aerodynamic coefficients obtained in this work will determine the wind load on this type of profile and can be used in design calculations of tower structures for wind loads.

The object of study is a mesh hyperboloid tower, which has a base diameter of 34 meters and a height of 128 meters, constructed by an engineer V.G. Shukhov. The survivability property of the mesh hyperboloid tower was accepted as a subject of research. The aim of the work is to perform a numerical calculation of the mesh hyperboloid tower for survivability in a static setting, under conditions of failure of individual load-bearing elements of the system as a result of an accident. This calculation evaluates the survivability of the structure. The research methodology involves consideration of several options for the collapse of the bearing elements: 1. Collapse of the intermediate rings of the 1st and 2nd tiers and 16 racks of the mesh tower, excluding power transmission cables; 2. Collapse of the intermediate rings of the 1st and 2nd tiers and 16 racks of the mesh tower, taking into account the influence of the load from the power transmission cables during operation. As a result, the most dangerous destruction zones are identified, from the point of view of the survivability of the structure, the survivability coefficient of the mesh tower, as a whole is determined. As a result of the calculations, it was revealed that when the intermediate rings and 16 racks in the tower elements are removed, the efforts in the elements adjacent to the collapse zone increase by 2.6 times. The asymmetry of the load on the removed elements plays a significant role in changing the efforts. With the removal of the intermediate rings of the 1st and 2nd tiers and 16 racks, the zone of the 1st lower tier becomes the most loaded. Compression efforts in the remaining racks of this tier increase by 150%. In addition, the number of compressed-bendable elements of the tower shell increase. The results of this work can be used by designers to calculate structures’ survivability.

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