Changing the Deformation Modules of the Coupling Joints of Reinforcement During Cyclic Loading

Currently, the practice of calculating and designing reinforced concrete structures for two groups of limit states is increasingly beginning to include the diagrammatic method, which is considered the most accurate. This method should be based on real diagrams of reinforcement and concrete deformation when calculating reinforced concrete structures. The above applies, among other things, to the calculation of reinforced concrete elements in the places of installation of coupling joints of reinforcement. However, this issue requires additional research both from an experimental and theoretical point of view, in particular, it is necessary to identify the effect of cyclic loading on the deformation diagrams of the reinforcement. In addition, the issue of constructing a universal dependence for deformation diagrams of various classes of reinforcement and its coupling joints in secant modules requires research. This type of dependence seems to be the most acceptable for the diagram calculation method. This article discusses the change in the deformation modules of coupling joints of reinforcement and solid reinforcement rods under medium cycle loading (up to 100,000 cycles) in the linear stage of deformation of class A500 reinforcement in the stress range from 150 MPa to 300 MPa. The experimental studies conducted at the Research Institute of Construction Physics are analyzed. The development of a diagrammatic methodology for calculating coupling joints is proposed, taking into account the changes in their deformation modules.

S.N. KARPENKO, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
I.G. CHEPIZUBOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.A. MOISEENKO, Lead Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Research Institute of Building Physics Russian Academy Architecture and Construction sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

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