Abstract.One of the urgent tasks of development of the construction associated with the development of new building designs, the use of which provides increased strength, crack resistance, reducing the flow of construction materials, reducing the labor intensity, energy consumption and cost. Ensuring effective functioning of structures during their operation in the harsh environments associated not only with the task of developing materials of higher strength and corrosion resistance, but also composites of increased strength and crack resistance, as structural materials crack resistance is largely determined by the ability of the structure to prevent the formation and growth of cracks. For structures operating in conditions of chemical action, the question of crack resistance is paramount, as the disclosure of cracks in aggressive environment, penetrating deep into the section and causing corrosion of the reinforcement will significantly impair the ability of the load bearing capacity of the element as a whole. The results of experiments of polymer concrete beams of the cross T-profile and comparison of the results with those obtained in an experiment similar to concrete and kauton reinforced elements are given. The observations of the stress-strain state of polymer concrete of flexural members, strength and crack resistance of these elements are presented.

Develop recommendations for the use of polymer-concrete bending structures is impossible without the creation or optimization of existing methods of calculation, this is especially true for bending elements that use multi-level reinforcement. Для применения (especially under the influence of aggressive environment) for use as a material for the manufacture of bending structures, we offer rubber concrete. – polymer-concrete, which is characterized by high strength characteristics. It is important to note that the composition of fibrorubcon used industrial waste such as fly ash and steel cord. Beams made from cauton and fibrocahuton were tested for pure bending - the most characteristic form of loading in the study of such elements. As a result of the theoretical studies of polymer concrete beams, the prerequisites were established for the calculation of the first group of limit states of rubcon beams and the method for calculating fibrorubcon beams was optimized. It was determined that fiber reinforcement with a percentage of reinforcement by mass of the rubcon element equal to 2.5% corresponds to the work of rod longitudinal reinforcement with a value of μ = 0.34%.

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The article presents a method for calculating a simply supported slab with a supple support contour using a numerical method in a computational software package. The support contour of a simply supported slab is formed by groups of two nodal finite elements, which allow modeling a linear supple bond in the vertical direction. They take into account the possibility of changes in the design scheme due to subsidence of the walls. The suppleness of the contour of prefabricated elements is 1 mm without taking into account the bends of the corners of a simply supported slab. The forces and reinforcement of a simply supported square slab were calculated according to the proposed methodology with a calculation where the joints of the contour are set to move in the vertical direction. As a result, the bending moments in the middle of the span increase, and the torques in the corners of the slab decrease. The reinforcement of the upper area of the slab is not required. The reinforcement of the lower area of the slab is increased by the amount of released reinforcement from the upper area of the slab.

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