Evaluation of the stress-strain state in steel oil storage tanks with a complex history of defect formation in load-bearing wall structures

This paper presents an example of the evaluation of the stress-strain state of a complex building structure in the form of a 5000 m3 steel storage tank used by the petroleum industry. Problem complexity lies in the fact that we consider the structure which, due to its improper installation, has essential defects of a total area of 100 m2 caused by the buckling in some zones of the steel strip rings of the tank. These imperfections reduce drastically the operation reliability and safety of the structure designed to withstand high operating loads. A cause of such defects and their contribution to the stress-strain state of the tank is the subject of our investigation.