Couplings slip determination of the threadbar of strength class 500 N/mm2

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Abstract

The authors present the results of R&D on the topic of coupling slip of threadbar of class Av500P. The aim of the work was to obtain experimental data to study the effect of the threadbar coupling on the slip (deformability) of the joint and taking into account the characteristics of the joint in the design of structures. The strength and deformability of coupling samples of threadbar with a diameter of 16, 25 and 40 mm with an innovative four-sided (four-row) thread profile of class Av500P have been studied in accordance with the methodology of international and Russian standards. The samples were made with different tightening torques of the lock nuts and anchor-adhesive compositions inside the coupling. Along with the results of the study, it can be concluded that these couplings of innovative four-row threadbar of class Av500P meet the requirements of international and Russian standards when applying a certain tightening torque to the tightened lock nuts, depending on the diameter of the fittings to be joined and the use of anchor-adhesive compositions on large and medium diameters of the threadbar to be joined. The diagrams of thread joints obtained during the experiment can be used in design practice when design reinforced concrete structures according to the deformation model. Together, this makes it possible to introduce thread joints into the Russian construction regulatory code.

About the authors

Grigorii E. Grishin

JSC “SIC ‘Construction’”, NIIZHB named after A.A. Gvozdev

Author for correspondence.
Email: gegrishin95@mail.ru
ORCID iD: 0000-0003-4646-7514

postgraduate student, design engineer of the Center No. 21, main specialist

6 2-ya Institutskaya St, bldg 5, Moscow, 109428, Russian Federation

Georgy I. Tikhonov

JSC “SIC ‘Construction’”, NIIZHB named after A.A. Gvozdev; Peoples’ Friendship University of Russia (RUDN University)

Email: 1042190020@pfur.ru
ORCID iD: 0000-0002-7010-4118

design engineer of the center No. 21, JSC “SIC ‘Construction’”, NIIZHB named after A.A. Gvozdev; postgraduate student, Department of Architecture, Academy of Engineering, Peoples’ Friendship University of Russia (RUDN University)

6 2-ya Institutskaya St, bldg 5, Moscow, 109428, Russian Federation; 6 Miklukho-Maklaya St, Moscow, 117198, Russian Federation

Ivan P. Savrasov

JSC “SIC ‘Construction’”, NIIZHB named after A.A. Gvozdev

Email: savrasov@cstroy.ru
ORCID iD: 0000-0002-3877-0460

Candidate of Technical Sciences, Deputy Director

6 2-ya Institutskaya St, bldg 5, Moscow, 109428, Russian Federation

Galina E. Okolnikova

Peoples’ Friendship University of Russia (RUDN University)

Email: okolnikova-ge@rudn.ru
ORCID iD: 0000-0002-8143-4614

Candidate of Technical Sciences, Associate Professor of the Department of Civil Engineering, Academy of Engineering

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Copyright (c) 2022 Grishin G.E., Tikhonov G.I., Savrasov I.P., Okolnikova G.E.

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