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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

The influence of concrete joints on the structural behavior

Vestnik MGSU 3/2014
  • Koyankin Aleksandr Aleksandrovich - Siberian Federal University (SibFU) Candidate of Technical Sciences, Associate Professor, Department of Building Structures and Control Systems, Siberian Federal University (SibFU), 79 Svobodny Avenue, Krasnoyarsk, 660041, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Beletskaya Valeriya Igorevna - Siberian Federal University (SFU) Master Degree student, Department of Engineering Structures and Controlled Systems, Siberian Federal University (SFU), 79 Svobodnyy Prospekt, Krasnoyarsk, 660041, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Guzhevskaya Anastasiya Igorevna - Siberian Federal University (SFU) Master Degree student, Department of Engineering Structures and Controlled Systems, Siberian Federal University (SFU), 79 Svobodnyy Prospekt, Krasnoyarsk, 660041, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 76-81

The buildings made of monolithic reinforced concrete currently enjoy great popularity. Along with a great number of advantages of monolithic building, which are repeatedly listed in the works of many authors, there are many unexplored issues which require detailed consideration. The technological concrete joints are among them. The joints are inevitable in the process of construction of almost any monolithic building and their quality affects the reliability of buildings and structures. Despite regular use of the concept of cold joint and clear instructions in building standards on the technology of joint production, most organizations do not follow the correct technology of concreting the elements. As a result, the strength and stiffness characteristics of the construction deteriorate, because the linkage value of new concrete with the old one is significantly lower than in monolith. In order to conduct experimental studies the reinforced concrete beams of rectangular section were produced. As a result of testing, it was determined that the presence of a concrete joint significantly reduces the stiffness and carrying capacity of the structures. It is confirmed by the fact that the received deflections of solid beams without joint are significantly lower than the deflections of beams with cold joint. It also noted that the deflections of the beams manufactured following the normative technology are lower, than the deflections of the beams, manufactured with violation of the rules. Basing on the obtained results, it was concluded, that more detailed study of the work of a construction with cold joints in concrete is required. The reason for it is in the changing for the worse of the strength and stiffness characteristics of structural element, which is made produced with a joint, while in the process of real designing, the monolith buildings are calculated as solid monolithic, without joints.

DOI: 10.22227/1997-0935.2014.3.76-81

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