DEFORMATION OF REINFORCED HIGH-STRENGTH LIGHTWEIGHT CONCRETE ELEMENTS UNDER COMBINED ECCENTRIC COMPRESSION AND TORSION
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Abstract
This paper presents the results of an experimental study on the deformation and failure of reinforced high-strength lightweight concrete elements under combined eccentric compression and torsion. The physical patterns and characteristics of deformation for such elements under the specified stress state have been established. The investigated parameters include concrete and reinforcement strains, crack patterns and crack widths, as well as deflections and angles of twist for the elements under consideration. The study demonstrates that crack formation in high-strength lightweight reinforced concrete structures has its own specificities: under loading with an eccentrically applied compressive force and a torque, one or several spatial cracks develop. As the load increases, one dominant crack emerges, leading to failure along this crack. A further characteristic of the deformation behavior is that after crack initiation, the deformation stage range leading to failure is more than two times shorter compared to structures made of conventional normal-weight concrete. A comparison of the obtained experimental data with the results of calculations based on the proposed analytical model confirms its reliability and potential for practical application.
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