Features of sections deformation of bend reinforced concrete elements under loads of high intensity
https://doi.org/10.33979/2073-7416-2023-107-3-3-16
Abstract
Many buildings are exposed to special effects of high intensity. When calculating reinforced concrete constructions both for special emergency loads and for seismic loads, the development of plastic strains in reinforcement is supposed just at the design stage. The experimental investigation of plastic deformations influence of the stress-strain state of normal sections of bending reinforced concrete elements has been made. According to the results of experiments, it has been found, that the hypothesis of plane sections is not observed in all cases. The approximation of deformations graph along the cross-section height by the bilinear function, variable during the load process, i.e hypothesis of bilinear sections, is more accurate. The dependence of coefficient A of the hypothesis of bilinear sections on the coefficient of plasticity for reinforcement deformations has been determined based on the results of numerical calculations of beams with symmetric reinforcement and beams without compressed reinforcement in a finite element software package Abaqus. The comparison of obtained numerical results with experimental data has been made, which has shown their satisfactory convergence. The maximum deviation does not exceed 13 %. The assessment of influence of coefficient of hypothesis of bilinear sections on the limit value of coefficient of plasticity for curvature, corresponding to the beginning of the destruction of compressed area of concrete is given.
About the Authors
S. O. Kurnavina
Moscow State University of Civil Engineering (National Research University)
Russian Federation
Russian Federation
Kurnavina Sofyia Ol, candidate of technical sciences, docent, associate professor of the department of reinforced concrete and stone structures
Moscow
I. V. Tsatsulin
Mosinzhproekt Institute LLC
Russian Federation
Russian Federation
Tsatsulin Ilya Vladimirovich, team leader
Moscow
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Review
For citations:
Kurnavina S.O., Tsatsulin I.V. Features of sections deformation of bend reinforced concrete elements under loads of high intensity. Building and Reconstruction. 2023;(3):3-16. (In Russ.) https://doi.org/10.33979/2073-7416-2023-107-3-3-16
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