The paper determines the actual stress-strain state of a vertical steel tank RVS-20000's bottom considering the subsoil base inhomogeneity zones of various sizes. Using the ANSYS software a finite element model of the RVS-20000's bottom has been developed. A design scheme proposed in the article takes into account the impact of the out-contour space. Analysis of the test calculation results has shown that the area of maximum stress acting on the vertical steel tank bottom is located along the perimeter of the base subsidence area. There are dependences that characterize tank bottom sags at maximum operating stress occurring in the metalwork of the tank bottom and concentrated on the border of the subsidence area out-contour zone in the paper end. It is found that Russian regulatory documents require harmonization with international standards.
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