Abstract
The results of tests of the bearing capacity of two-pass’s non-separable reinforced concrete beams under the influence of low-cyclic repetitive and sign-loaded loadings, in which features of change of reference reactions, bending moments and deformations of concrete and reinforcement are revealed. It is established that the process of changing these parameters is stabilized by 5-6 load cycles. The changes in the voltage of the deformed state of normal and inclined sections of experimental samples by the values of the indicated loads are also revealed and analyzed.Test results showed that there has been repeated cyclic alternating loadings and impact on the carrying capacity, reducing its straightforward compared to static loadings. The reasons of the bearing capacity’s reducing are determined by the concrete tension of both extended and compressed zones, as well as the formation of microcracks in concrete even at high loadings’ levels. Taking into account the specified features of changing the stress-strain state for the above-mentioned loadings will increase the reliability of reinforced concrete non-separable constructions during their operation.
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