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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Calculation of reinforced concrete beam reliability on operation stage by crack length criterion

Vestnik MGSU 1/2016
  • Utkin Vladimir Sergeevich - Vologda State University (VStU) Doctor of Technical Sciences, Professor, Department of Industrial and Civil Engineering, Vologda State University (VStU), 15 Lenina str., Vologda, 16000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Solov’ev Sergey Aleksandrovich - Vologda State University (VStU) postgraduate student, Assistant Lecturer, Department of Industrial and Civil Engineering, Vologda State University (VStU), 15 Lenina str., Vologda, 16000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 68-79

The mechanical (structural) reliability of a building, safety of people and continuity of the technological processes in buildings and structures depend on the reliability of the bearing structures on operation stage, including reinforced concrete beams. One of the measures to provide safety and reliability is the probability of no-failure operation of structural elements or systems of elements. For reliability calculation the Russian State Standard recommends to apply probability and statistical methods when possessing enough data on variability of the controlled parameters in the mathematical model of the limit state, in particular, when the amount of data allows conducting its statistical analysis. In the current time there appear the works pointing, that the future advancing of calculation methods for building structures requires the wide use of reliability theory. The article describes the methods for calculating the reliability of a reinforced concrete beam according to the criterion of crack length with the limited statistical information about controlled parameters. The authors illustrate the application of the theory of evidence to determine the statistical mathematical expectation of reliability in the presence of a subset of reliability intervals. Each design case is followed by numerical examples. The article underlines the importance of applying fracture mechanics for the further development of the methods of calculation of reinforced concrete structures.

DOI: 10.22227/1997-0935.2016.1.68-79

References
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STRESS-STRAIN STATE IN EMBEDMENT OF REINFORCEMENT IN CASE OF REPEATED LOADINGS

Vestnik MGSU 5/2016
  • Mirsayapov Ilshat Talgatovich - Kazan State University of Architecture and Engineering (KSUAE) Candidate of Technical Sciences, Associate Professor, Department of Architecture, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya str., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 28-38

The author offer transforming the diagram of ideal elastic-plastic deformations for the description of the stress-strain state of embedment of reinforcement behind a critical inclined crack at repeatedly repeating loadings. The endurance limit of the adhesion between concrete and reinforcement and its corresponding displacements in case of repeated loadings are accepted as the main indicators. This adhesion law is the most appropriate for the description of physical and mechanical phenomena in the contact zone in case of cyclic loading, because it simply and reliably describes the adhesion mechanism and the nature of the deformation, and greatly simplifies the endurance calculations compared to the standard adhesion law. On the basis of this diagram the author obtained the equations for the description of the distribution of pressures and displacements after cyclic loading with account for the development of deformations of cyclic creep of the concrete under the studs of reinforcement.

DOI: 10.22227/1997-0935.2016.5.28-38

References
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