Purpose of the work: to establish the features of the stress-strain state of precast-monolithic non-dissecting reinforced concrete beams under the action of repeated (low-cycling) loads. Analysis of recent studies of precast monolithic beams has been performed. The research methodology and the design of the test samples are given. The results of the experimental studies of the stress-strain state of precast-monolithic non-dissecting reinforced concrete beams with non-stressed and prestressed joints under the action of repeated (low-cycling) loads at different levels are described. Differences in the operation of beams at repeated loads of operational level and overloading above the operational level are shown.Circuit diagrams of specimens of various structures with prestressed and non-stressed joints above the support and in flight are presented.According to the results of the tests, the following conclusions were reached: during repeated low-cycle loadings of the operational level on the fifth-sixth cycles, the stress-strain state of the precast-monolithic non-dissecting reinforced concrete beams stabilizes; loading above the operational level significantly increases the deformation of reinforcement and concrete; the prestress of the reinforcement joints reduces the deformation of the overpressure reinforcement, and practically does not change the amount of deformation of the concrete and the span reinforcement.
