DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

DESIGN OF STRUCTURAL ELEMENTS IN THE EVENT OF THE PRE-SET RELIABILITY, REGULAR LOAD AND BEARING CAPACITY DISTRIBUTION

Vestnik MGSU 10/2012
  • Tamrazyan Ashot Georgievich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, full member, Russian Engineering Academy, head of the directorate, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe Shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 109 - 115

Accurate and adequate description of external influences and of the bearing capacity of the structural material requires the employment of the probability theory methods. In this regard, the characteristic that describes the probability of failure-free operation is required. The characteristic of reliability means that the maximum stress caused by the action of the load will not exceed the bearing capacity.
In this paper, the author presents a solution to the problem of calculation of structures, namely, the identification of reliability of pre-set design parameters, in particular, cross-sectional dimensions. If the load distribution pattern is available, employment of the regularities of distributed functions make it possible to find the pattern of distribution of maximum stresses over the structure.
Similarly, we can proceed to the design of structures of pre-set rigidity, reliability and stability in the case of regular load distribution. We consider the element of design (a monolithic concrete slab), maximum stress which depends linearly on load . Within a pre-set period of time, the probability will not exceed the values according to the Poisson law.
The analysis demonstrates that the variability of the bearing capacity produces a stronger effect on relative sizes of cross sections of a slab than the variability of loads. It is therefore particularly important to reduce the coefficient of variation of the load capacity. One of the methods contemplates the truncation of the bearing capacity distribution by pre-culling the construction material.

DOI: 10.22227/1997-0935.2012.10.109 - 115

References
  1. Lychev A.S. Sposoby vychisleniya veroyatnosti otkaza v kompozitsii raspredeleniy prochnosti i nagruzki [Methods of Calculation of the Probability of Failure within the Framework of the Distribution of Strength and Load]. Trudy mezhdunarodnoy nauchno-tekhnicheskoy konferentsii [Collected works of the international scientific and technical conference]. Samara, 1997, pp. 33—37.
  2. Tichy M. In the Reliability Measure. Struct. Safety. 1988, vol. 5, pp. 227—232.
  3. Araslanov A.S. Raschet elementov konstruktsiy zadannoy nadezhnosti pri sluchaynykh vzaimodeystviyakh [Calculation of Structural Elements with the Pre-set Reliability If Exposed to Random Interactions]. Moscow, 1986, 268 p.
  4. Tamrazyan A.G. Otsenka riska i nadezhnosti nesushchikh konstruktsiy i klyuchevykh elementov — neobkhodimoe uslovie bezopasnosti zdaniy i sooruzheniy [Assessment of Risk and Reliability of Bearing Structures and Key Elements as the Necessary Condition of Safety of Buildings and Structures]. Vestnik TsNIISK [Bulletin of Central Research and Development Institute of Building Structures]. 2009, no. 1, pp. 160—171.
  5. JSO/TK 98 ST 2394. General Principles on Reliability for Structures. 1994, pp. 50.
  6. Rayzer V.D. Teoriya nadezhnosti v stroitel’nom proektirovanii [Theory of Reliability in Structural Design]. Moscow, ASV Publ., 1998, 304 p.

Download

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

Download

Results 1 - 2 of 2