Stress-Strain State of Normal Sections of Precast-Monolithic Reinforced Concrete Beams

The paper is devoted to theoretical and experimental studies of the stress-strain state of normal sections of precast-monolithic reinforced concrete beams. It is noted that at present there is a significant increase in interest in methods for calculating reinforced concrete structures taking into account nonlinear diagrams of concrete deformation. This is due both to the occurrence of reliable experimental data on the parameters of such a diagram, and to the widespread use of computational techniques. At the same time, despite the fact that numerous studies were conducted on studying the force resistance of reinforced concrete bending elements of composite sections and the development of methods of their calculation considerable success has been achieved, the tasks associated with the analytical evaluation of the stress-strain state of normal sections of precast-monolithic concrete beams have been remained unsolved. In this regard, a refined calculation method has been developed that allows determining the parameters of the stress-strain state at all stages of loading. For its justification, special experimental studies of samples of precast-monolithic reinforced concrete beams were conducted. The results of control tests are described and their brief analysis is made. Numerical studies on the convergence of theoretical and experimental data were carried out. The accuracy of the developed calculation method is estimated.