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CREEP AND SHRINKAGE OF REINFORCED CONCRETE THIN-WALLED CYLINDRICAL PANELS

One of the main tasks that is solved at the design stage of a reinforced concrete structure and its elements is the analysis of the stress-strain state, as well as the determination of the service life of the structure. The article is devoted to modeling the nonlinear creep of reinforced concrete structural elements taking into account damage and shrinkage of concrete. The high priority of the research topic is substantiated, the goals and objectives of the research are formulated. A combination of a plastic model with fracture mechanics is proposed to simulate the behavior of concrete in accordance with its characteristics, including not only stress and deformation, but also the change in its characteristics over time. The obtained equations of state correspond to the incremental creep law, taking into account the damage and shrinkage. The finite element method is used to solve a boundary value problem. For the purpose of numerical modeling of thin-walled structures, it is proposed to use special shell elements. The mathematical formulation of the problem of creep of reinforced concrete structural elements taking into account creep deformations and volumetric deformations of concrete shrinkage is presented. The problems of creep of thin-walled structural elements were solved using the developed proprietary software. Deformations of a reinforced concrete cylindrical panel are analyzed. Analysis of the results allows us to judge the effectiveness of the proposed model as a whole. The equation of state reflects the properties of the material and takes into account damage, allows you to reliably assess the strength, rigidity and durability of thin-walled reinforced concrete structures. Conclusions are presented regarding the adequacy of the analysis of the reliability and durability of reinforced concrete structures using the proposed model.