STUDY OF THE STRESS-STRAIN STATE OF THE PONTOON ELEMENT OF THE SUPPORT BLOCK

Oil and gas production on the continental shelf is carried out from offshore structures, a significant part of which are fixed platforms. Many of them have a core spatial structure as a supporting block, consisting of pipes of various diameters. The article proposes a method for analyzing and improving geometric shapes, taking into account the physical properties of the pontoon material, which allows solving specific practical problems. The influence of various factors on the stress distribution of pontoons has been revealed. A general method for linearization of thin-walled structures with variable geometric parameters characterized by accelerated convergence is proposed. An effective calculation method based on the small parameter method has been developed. Based on the developed methods, a computational algorithm was found and a set of application programs was compiled. The problems of moment and the general theory of shells were considered accordingly. In designs that provide sufficient strength and manufacturability, all real properties of materials were taken into account and more accurate design methods were found. For a large-scale class of problems of nonlinear structural mechanics, taking into account the physical properties of materials makes it possible to identify additional reserves of their strength. The use of nonlinear theory makes it possible to clarify the calculation of stresses and select the optimal dimensions and cross-sectional shape of the pontoon element of the support block. Based on the calculation results, certain formulas and methods have been compiled that can be used in engineering practice.