Influence of structural and technological factors on indicators of transversal reinforcement of reinforced concrete beams
https://doi.org/10.33979/2073-7416-2023-107-3-42-57
Abstract
The paper considers the influence of various factors on the actual length of clamps in the design of sections of linear bending reinforced concrete elements. The aim of the work is to determine the degree of influence of clamps of various configurations and other factors on the length of the clamp at various cross-sectional dimensions of a linear bending element. The obtained data and dependences make it possible to obtain the most effective solutions for reinforcing inclined sections with minimal cost. The calculation-analytical research method was used, based on the analysis of the results of calculations for various types of transverse reinforcement, the ratio of the diameters of the longitudinal and transverse reinforcement, the values of the protective layer, the radius of the bend of the clamp and the dimensions of the section. An expression is proposed for calculating the actual length of the clamp, depending on the dimensions of the section, the coefficient of reinforcement and the thickness of the protective layer, taking into account the mandrels used.
Graphs of the change in the length of the collar for various section sizes b×h from 20×40 cm to 55×80 cm and with a reinforcement coefficient of 0.1%≤μ≤3% have been obtained. The graphs show savings in the length of the clamp from 6.7-7.4%, when using working fittings Ø6, to 12.2-37.9%, when using working fittings Ø40. The dependencies of strength reduction under conditions of inaccurate binding of the working longitudinal reinforcement to the collars are analyzed. The data obtained indicate a decrease in the strength of normal sections of beams from 0.33% to 10.78%. The paper considers the influence of various factors in the design of the sections of linear bending elements on the actual length of the clamps in accordance with accepted standards. Thanks to the obtained data and dependences, it is possible to refine the consumption of transverse reinforcement in beams for its more economical use.
About the Authors
Yu. A. Shaposhnikova
Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Shaposhnikova Yulia A. candidate in technical sciences, associate professor, associate professor of the department of Reinforced Concrete and stone Structures.
Moscow
V. S. Kuznetsov
Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Kuznetsov Vitaly S.candidate in technical sciences, professor.
Moscow
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For citations:
Shaposhnikova Yu.A., Kuznetsov V.S. Influence of structural and technological factors on indicators of transversal reinforcement of reinforced concrete beams. Building and Reconstruction. 2023;(3):42-57. (In Russ.) https://doi.org/10.33979/2073-7416-2023-107-3-42-57
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