К ВОПРОСУ УЧЕТА НЕУПРУГИХ ДЕФОРМАЦИЙ ЖЕЛЕЗОБЕТОННЫХ КОНСТРУКЦИЙ

Abstract

The article considers the actual problem of taking into account inelastic deformations of reinforced concrete structures during design, which affects the reliable operation of structures. The analysis of existing calculation methods, the results of experimental tests of prismatic samples and numerical modeling in the ANSYS program, taking into account the regulatory requirements of the Joint Venture of the Republic of Kazakhstan, is carried out. 5.03-34-2005 , Eurocode 2, as well as the Bazhant-Bavea B3 models.It is established that the complete deformation of concrete is formed due to elastic, creeping, shrinkage and residual components. Experimental data show that creeping deformations reach ~700 µe during the first five years, while shrinkage is on the order of -300 µe. Calculations based on the B3 model show the smallest discrepancy with experimental results (< 5%), and the modulus method significantly underestimates the magnitude of deformations by 30-35%. Recommendations on the practical application of modern calculation models (Eurocode 2, B3) in design are formulated, which will improve the accuracy of determining deflections and curvature, as well as ensure the reliability and durability of structures.