The test results on deformation and rigidity of short compressed reinforced concrete pillars with various types of external transverse and longitudinal composite reinforcement are given. The samples from heavy concrete with design strength class B30-35 were tested, having the same cross-section 250x125 (h) mm and length 1200mm with flexibility λh = 10. The pillars were reinforced with 4Ø12A500 in the longitudinal direction and with tied clamps Ø6B500, installed with the step of 180 mm -in the

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... ansverse direction. The purpose of the experiment was to determine the effect of the rigidity of reinforced elements on the deformability of short experimental samples. It was necessary to determine how the eccentricity of the load application influences on the variation in the rigidity of the reinforced elements. The purpose was also to obtain data on the deformability of pillars loaded with small eccentricities, i.e. when е 0 = 0.16h. It was found that the most effective type for short pillars reinforcement is a three-layer holder, which has maximum rigidity and minimal deformability. However, its efficiency gradually decreases when the eccentricity of the load application increases. * Corresponding author: muradyan2007@yandex.ru MATEC Web of Conferences 196, 02026 (2018) https://doi.org/10.1051/matecconf/201819602026 XXVII R-S-P Seminar 2018, Theoretical Foundation of Civil Engineering base of conducted experiments. It concerns the properties and design features of highstrength concrete [1-4]. Problems connected with the theory and practice of prestressed structures, for which the variable prestressing along the length of structures are urgent, are still being solved [5] [6] [7] . There is a special attention to the issues of using the composite materials in construction which has been developing in two areas. The first is the use of bars reinforcement as a working one, which is especially important for carbon fiber reinforced plastic having almost identical modulus of elasticity with steel [8] [9] [10] . The second is the use of composite external reinforcement for reinforced concrete structures. It is carried out in three directions. The bent elements reinforcement can be along the normal (1st) and oblique sections (2nd) directions [11] [12] [13] . The third direction is the reinforcement of compressed elements of different flexibility [14] ; type of stressed-deformed state [15, 16] and options for transverse or longitudinal reinforcement [17] .