Structural Mechanics of Engineering Constructions and BuildingsStructural Mechanics of Engineering Constructions and Buildings1815-52352587-8700Peoples’ Friendship University of Russia (RUDN University)1728010.22363/1815-5235-2017-6-37-44Research ArticleEXPERIMENTAL STUDIES OF DEFORMATION OF REINFORCED CONCRETE STRUCTURES SUBJECTED TORSION AND BENDINGDEMYANOVALEKSEJ IVANOVICH<p>candidate of technical sciences, associate professor of the department of industrial and civil engineering. Scientific interests: the study of composite structures in complex resistance, the study of the survivability of structural systems and reinforced concrete and other non-linearly deformed materials, experimental studies in reinforced concrete structures, computer tech- nologies for computational analysis of buildings and structures</p>speccompany@gmail.comKOLCHUNOVVLADIMIR IVANOVICH<p>doctor of technical sciences, Professor of the department of industrial and civil engineering. Scientific interests: building mechanics, building structures, rein- forced concrete theory, experimental studies of building structures, physical and mathematical models of structures</p>vlik52@mail.ruPOKUSAEVALEXEI ALEXANDROVICH<p>Construction and Structures. Scientific interests: theoretical and experimental studies of the survivability of buildings and structures, modeling of reinforced concrete structures, testing of reinforced concrete structures with solid and composite element</p>fvs_Aleksej456@yandex.ruSouth-West State UniversityMoscow State University of Commu- nications, Emperor Nicholas II, Institute of Ways151220176374416112017Copyright © 2017, DEMYANOV A.I., KOLCHUNOV V.I., POKUSAEV A.A.2017<p>The results of experimental studies of reinforced concrete constructions at complex resistance to torsion with bending are shown in the article. The main purposes of the researches are detection of regularities and determination of deformation and cracking parameters. The most important of the studding parameters are cracking load, destructive load, the coordinates of spatial cracks formation, the width of crack's opening at the axis of the longitudinal and transverse tensile reinforcement and along the entire profile of cracks; changing the distance be- tween the cracks and crack length according to increasing the deformation load; deformation of compressed concrete and reinforcement in a complex stress-strain state. The test results are presented in the form of relationships of structure's deflections, deformations of compressed concrete and reinforcement, including results which were determined by the indications of electrotensometric sockets. The obtained relationships allow us to assess the reliability of the calculating methods reinforced concrete constructions subjected the action torsion and bend- ing.</p>reinforced concretetorsionbendingexperimental studiesdeformationscrack resistancecomplex stress stateжелезобетонкручениеизгибэкспериментальные исследо- ваниядеформациитрещиностойкостьсложное сопротивление[Veryuzhskiy,Yu.V., Golyshev, A.B., Kolchunov, Vl.I., Klyueva, N.V., Lisitsin, B.M., Mashkov, I.L., Yakovenko, I.A. (2014). Spravochnoe posobie postroitel'noy mekhanike [Reference Manualon Building Mechanics], Tom I: Uchebnoe posobie, ASV Publ., Moscow. 640 р. (In Russ.)][Golyshev, A.B. (2009). Soprotivlenie Zhelezobetona [Resistance of Reinforced Concrete]: monography, Osnova Publ., Kiev. 432 p. (In Russ.)][Karpenko, N.N., Elagin, E.G. (1971). Deformatsii Zhelezobetonnykh Trubchatykh Elementov pri Izgibe s Krucheniem. 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Raschetnaya model' obrazovaniya pros-transtvennykh treshchin pervogo vida pri kruchenii s izgibom. Promyshlennoe i Grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. No 3. P. 35—40. (In Russ.)][Salnikov, A.S., Kolchunov, Vl.I., Kolchunov, V.I. (2015). Metodika rascheta predel'noy nagruzki i koordinat obrazovaniya prostranstvennoy treshchiny pervogo vida v zhelezobetonnykh konstruktsiyakh pri kruchenii s izgibom. Building & Reconstruction. No 6(62). P. 49—56. (In Russ.)][Kolchunov, Vl.I., Rypakov, D.A. (2016). Modeling of cracks in reinforced concrete constructions in torsion with bending. Structural Mechanics of Engineering Constructions and Buildings. No 5. P.11—16. (In Russ.)][Salnikov, A.S., Klueva, N.V., Kolchunov, Vl.I. (2016). The method for determining minimum load and the coordinates of the spatial crack formation in reinforced concrete structures under torsion with bending. Promyshlennoe i Grazhdanskoe Stroitel'stvo [Industrial and Civil Engineering]. Vol. 1. 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