DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

RESEARCH OF RELIABILITY OF A LONG-SPAN STRUCTURE EXPOSED TO RANDOM SEISMIC IMPACTS

Vestnik MGSU 5/2012
  • Mondrus Vladimir L'vovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Head of Department of Structural Mechanics 8 (495) 287-49-14, ext. 3141, Moscow State University of Civil Engineering (MSUCE), 26 Jaroslavskoe shosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Mkrtychev Oleg Vartanovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of Strength of Materials, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Mkrtychev Artur Eduardovich - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Department of Structural Mechanics, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337; Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 56 - 61

The article covers the problem of assessment of structural reliability in the course of random seismic impacts. The authors apply the Monte Carlo method and the method of canonical decomposition to generate accelerograms, and explicit time integration methods, by taking account of physical, geometrical and structural nonlinearities. The research results were subjected to statistical post-processing, and the analysis revealed that the structure demonstrated its high reliability. Therefore, the authors believe that the proposed approaches can be used to solve reliability problems that constitute variable processes.

DOI: 10.22227/1997-0935.2012.5.56 - 61

References
  1. Bolotin V.V. K raschetu stroitel’nykh kotstruktsiy na seysmicheskie vozdeystviya [Calculation of Building Structures Exposed to Seismic Impacts]. Stroitel’naya mehanika i raschet sooruzheniy [Structural Mechanics and Structural Analysis]. Moscow, 1980, no. 1, pp. 9—14.
  2. Bolotin V.V. Nelineynye modeli v raschetakh sooruzheniy na seysmostoykost’ [Nonlinear Models in Seismic Analysis of Structures]. Vestnik RAASN [Proceedings of Russian Academy of Architecture and Building Sciences]. Moscow, 1999, pp. 88—92.
  3. Rzhanitsyn A.R. Teoriya rascheta stroitel’nykh konstruktsiy na nadezhnost’ [Theory of Reliability Analysis of Structures]. Moscow, Stroyizdat Publ., 1978, 239 p.
  4. Rayzer V.D. Teoriya nadezhnosti sooruzheniy [Theory of Reliability of Structures]. Moscow, ASV Publ., 2010, 384 p.
  5. Mkrtychev O.V., Mkrtychev A.E. Raschet bol’sheproletnykh i vysotnykh sooruzheniy na ustoychivost’ k progressiruyushchemu obrusheniyu pri seysmicheskikh i avariynykh vozdeystviyakh v nelineynoy dinamicheskoy postanovke [Analysis of Reliability of High-rise and Long-span Structures Exposed to Seismic and Emergency Impacts based on Nonlinear Dynamic Approach]. Stroitel’naya mehanika i raschet sooruzheniy [Structural Mechanics and Structural Analysis]. Moscow, 2009, no. 4, pp. 43—49.
  6. Mkrtychev O.V. Bezopasnost’ zdaniy i sooruzheniy pri seysmicheskikh i avariynykh vozdeystviyakh [Safety of Buildings and Structures Exposed to Seismic and Emergency Impacts]. Moscow, Moscow State University of Civil Engineering, 2010, 152 p.
  7. Mondrus V.L., Mkrtychev O.V., Mkrtychev A.E. Veroyatnostnyy raschet bol’sheproletnogo sooruzheniya na ekspluatatsionnye nagruzki [Probabilistic Analysis of a Long-span Structure Exposed to Operation Loads]. Promyshlennoe i grazhdanskoe stroitel’stvo [Civil and Industrial Construction]. 2009, no. 3, pp. 21—22.

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ESTIMATES OF PRESTRESS LOSSES AND FORCES SCATTER IN REINFORCEMENT OF SPAN REINFORCED CONCRETE STRUCTURES

Vestnik MGSU 6/2018 Volume 13
  • Ahaieva Olha - Odessa State Academy of Civil Engineering and Architecture (OSACEA) , Odessa State Academy of Civil Engineering and Architecture (OSACEA), 4 Didrikhsona st., Odessa, 65029, Ukraine.
  • Karpiuk Vasyl - Odessa State Academy of Civil Engineering and Architecture (OSACEA) , Odessa State Academy of Civil Engineering and Architecture (OSACEA), 4 Didrikhsona st., Odessa, 65029, Ukraine.

Pages 686-696

Subject: the article is devoted to investigation of prestress losses and force distribution in the reinforcement of span reinforced concrete structures. As the long-term studies have shown, these quantities are very unstable, which should be taken into account in structures design. However, the existing normative documents take into account the possible deviations of losses and forces in prestressed reinforcement from their design values in a fairly general form. Since each of the types of losses, according to the formulas, depends on one or several random factors, they should be considered from a probabilistic point of view. Research objectives: determine the scattering of different losses and acting forces in the prestressed reinforcement to identify the factors affecting its value. Materials and methods: in this work, we used the normative technique of prestress losses calculation and characteristics of the variability of physical and mechanical properties of concrete and reinforcement, obtained from the previous studies. The distribution laws of investigated parameters were assumed to be normal (the Gaussian law). To calculate the coefficients of variation, the method of statistical testing (the Monte-Carlo method) and the linearization method (the Taylor series expansion) implemented in MATLAB software package were applied. Results: in the process of numerical experiment, the values of prestress losses and forces scatter in the reinforcement were obtained for all prestressing methods stipulated by the current design codes. It was established that both values depend significantly on the method of reinforcement tensioning, its type and class, and also on the diameter of wire. Moreover, many concomitant factors affect the variability of the above-mentioned characteristics such as the plant-manufacturer, stability of technological process, qualification of the service staff, etc. Conclusions: the obtained data is recommended to be used to determine the accurate values of strength, deformability and crack resistance of span reinforced concrete structures as well as in probabilistic calculations related to the assessment of their reliability by various limit states. In particular, the described technique was applied in calculating the reliability of bent prestressed elements from the viewpoint of strength of oblique sections.

DOI: 10.22227/1997-0935.2018.6.686-696

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