DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Estimation of seismic resistanceof an industrial building: probabilistic approach

Вестник МГСУ 11/2013
  • Zolina Tat’yana Vladimirova - Astrakhan Institute of Civil Engineering (AICI) Candidate of Technical Sciences, Professor, vice-rector, Astrakhan Institute of Civil Engineering (AICI), 18 Tatishchev str., 414056, Astrakhan, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Sadchikov Pavel Nikolaevich - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Associate Professor, Department of Automated Design and Modeling Systems, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 42-50

This article represents the results of the research of general approaches and methods of risk evaluation for further exploitation of industrial buildings under seismic loads. Algorithms, developed or adopted by the authors of the article are designed for evaluating strength and stability of an industrial building, considered as a three-dimensional two-mass system, where the calculation points are located at the nodes of intersection of columns and brake structures of frames and the longitudinal axis of coating.Solving the problem of integral reliability and durability of buildings and structures as well as well-balanced design and strength under extreme conditions means to perform quantitative assessment of risk and to minimize it. Most existing analysis and risk evaluation methods are qualitative and estimate the probability of an emergency situation.Algorithm, offered by the authors of this article, includes assessment of seismic vulnerability risk of a construction in case of an earthquake of certain intensity. Problems, arising due to the complexity of probabilistic calculations, are solved by using automated control systems.Using classic methods of statistic dynamics and reliability theory, the authors offer a probability calculation, including the following:• Cop has aland quarter phase spectraldensity components of seismic movements;• entrance and exit spectrums;• dispersion of generalized coordinatesfor each natural frequency of a building;• waveform factor matrix;• effective oscillation period of a con-struction under seismic load;• failure frequencies at significancevalue;• total dispersion for all waveforms;• conventional, external and full seismicrisk.The given method of evaluating resistance of buildings and constructions to seismic loads is a probabilistic method and can be used as a basis for algorithms to automatize corresponding calculations during engineering design and exploitation of buildings and constructions.

DOI: 10.22227/1997-0935.2013.11.42-50

Библиографический список
  1. Lychev A.S. Veroyatnostnye metody rascheta stroitel’nykh elementov i sistem [Probabilistic Methods for Calculating Construction Components and Systems]. Moscow, Assotsiatsiya stroitelnyih vuzov Publ., 1995, 143 p.
  2. Esteva L., Rosenblueth E. Espectros de Tembloles a Distancians Moderadas y Grandes. Bol. Soc. Mex. Ing. Sism., 1964, no. 2(1), pp. 1—18.
  3. Rayzer V.D. Teoriya nadezhnosti v stroitel’nom proektirovanii: monografiya [The Theory of Reliability in Construction Design: monograph]. Moscow, ASV Publ., 1998, p. 304.
  4. Tichy M. On the reliability measure. Structural Safety. 1988, vol. 5, pp. 227—235.
  5. Tamrazyan A.G. Otsenka riska i nadezhnosti konstruktsiy i klyuchevykh elementov — neobkhodimoe uslovie bezopasnosti zdaniy i sooruzheniy [Risk and Reliability Assessment of Structures and Key Elements as a Necessary Factor for the Safety of Buildings and Structures]. Vestnik TsNIISK [Proceedings of Central Research Institute of Construction Structures Named after V.A. Kucherenko]. 2009, no. 1, pp. 160—171.
  6. Zolina T.V. Veroyatnostnyy raschet odnoetazhnogo promyshlennogo zdaniya, oborudovannogo mostovym kranom, s uchetom prostranstvennoy raboty ego karkasa [The Probabilistic Calculation of One Storey Industrial Building Equipped with a Bridge Crane, Taking into Account the Spatial Work of its Carcass]. Vestnik VolgGASU. Seriya Stroitel’stvo i arkhitektura [Proceedings of Volgograd State University of Architecture and Civil Engineering. Construction and Architecture Series]. 2012, no. 28 (47), pp. 7—13.
  7. Pshenichkina V.A., Belousov A.S., Kuleshova A.N., Churakov A.A. Nadezhnost’ zdaniy kak prostranstvennykh sostavnykh sistem pri seysmicheskikh vozdeystviyakh [Reliability of buildings as spatial composite systems under seismic effects]. Volgograd, VolgGASU Publ., 2010, 224 p.
  8. Barshteyn M.F. Prilozhenie veroyatnostnykh metodov k raschetu sooruzheniy na seysmicheskie vozdeystviya [The Application of Probabilistic Methods to the Analysis of Structures for Seismic Effects]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Calculation of Structures]. 1960, no. 2, pp. 6—14.
  9. Tamrazyan A.G. Raschet elementov konstruktsiy pri zadannoy nadezhnosti i normal’nom raspredelenii nagruzki i nesushchey sposobnosti [Calculation of Structural Elements at a Given Reliability and the Normal Load Distribution and Bearing Capacity]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2012, no. 10, pp. 109—115.
  10. Zolina T.V., Sadchikov P.N. Avtomatizirovannaya sistema rascheta promyshlennogo zdaniya na kranovye i seysmicheskie nagruzki [The Automated System of Calculation of an Industrial Building on the Crane and Seismic Loads]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2012, no. 8, pp. 14—16.

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MODELING OF THE SNOW LOAD ON THE ROOFS OF INDUSTRIAL BUILDINGS

Вестник МГСУ 8/2016
  • Zolina Tat’yana Vladimirovna - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Professor, First Vice-rector, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Sadchikov Pavel Nikolaevich - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Associate Professor, Department of Automated Design and Modeling Systems, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 25-33

When designing load-bearing framework structures using the method of limiting states it is necessary to determine the maximum possible value of snow load for the entire period of operation of an industrial building for the possibility of transition. The magnitude of the snow load is randomly changed over the time, and therefore the most appropriate form of its display is a probabilistic model of random process. The authors have identified the most preferable approach to modeling of snow load. It consists in presenting a selective sequence of the year maximums in the form of a continuous random variable distributed according to the Gumbel law. Its parameters are expressed through the mathematical expectation and the standard sample set of meteorological observations. According to the calculated values of the parameters the authors have built a graphic interpretation of the law of distribution of this random variable. When building a model of the total snow load on the roof of a building the influence of various factors should be considered, such as: • snow shedding at a given roof slope; • snow movement caused by wind; • distribution of snow depending on the roof shape; • snow melting depending on the thermal characteristics of the roof; • the ability to drain meltwater from the surface of the roof. The resulting model of snow load is adapted for implementation using software complex “DINCIB-new” developed by the authors. The proposed approach to the modeling of the snow load on the roof of an industrial building allows correlating the repeatability period of its limit calculated value with the residual life of the research object. This has become possible due to the multiple implementation of an automated algorithm for calculating an industrial building, which was developed by the authors, with account of the varying values of snow load in relation to the corresponding mathematical expectation, with registering the quantities of other components of the generalized load.

DOI: 10.22227/1997-0935.2016.8.25-33

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INVESTIGATION OF RANDOM WIND LOAD IMPACTS ON THE FRAMEWORK OF A SINGLE STOREY INDUSTRIAL BUILDING

Вестник МГСУ 9/2016
  • Zolina Tat’yana Vladimirovna - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Professor, First Vice-rector, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Sadchikov Pavel Nikolaevich - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Associate Professor, Department of Automated Design and Modeling Systems, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 15-25

Geometrical characteristics of obstacles on the ground, which determine the roughness of the terrain, cause the air flow turbulence. The friction level of air flow on the surface depends on the height and density of the location of obstacles, which determines the magnitude and direction of the load on a corresponding specific object. Any obstacle located in the way of the turbulent flow experiences a corresponding wind load. In the given study we have considered a multi-span one-storey industrial building as an obstacle. In order to estimate the load on the object of study caused by the wind, we decomposed the corresponding load into two components: middle and fluctuating. The first one shows the static wind load characteristics estimated according to the territorial division into districts of the Russian Federation, where the areas of calculated values of wind pressure are exhibited. Their distribution is the result of the implementation of the probabilistic model presented in the form of non-stationary random field of wind flow speeds. In order to obtain calculated values and automated processing of the value of wind load on the surface of an industrial building under blow the profiles of wind flow velocities at different heights were approximated. The resulting functional dependency on the heights is of a distinct power character. In order to describe the dynamic parameters of the process, presented in the form of the fluctuating component of wind load and the resulting reactions of structural elements of the building, we considered the random functions according to the time parameter. They represent the energy spectrum of the proportion of the wind flow power, attributable to an infinitesimal frequency band. The set of reciprocal spectral densities when selecting the points in space, each of which determines the correlation degree between the states of a random process, has allowed establishing the magnitude of the correlation coefficient of wind pressure pulsations to the entire surface of the building. When studying wind load impact on the operation of an industrial building framework, the corresponding response elements of the system are defined separately from the effects of the average and the sum of pulsation components. The combined effect which corresponds to the most unfavorable load value is achieved in case of coincidence of their signs. The present approach to the assessment of the forces caused by wind and the response to them on the part of the object became the basis of the calculation methodology as one of the components of the generalized load on the object of study.

DOI: 10.22227/1997-0935.2016.9.15-25

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STRUCTURAL RELIABILITY IN EUROCODES

Вестник МГСУ 11/2012
  • Holický Milan - Czech Technical University in Prague (CTU) Ph.D., Prof., Deputy Director, Klokner Institute, +420 2 2435 3842, Czech Technical University in Prague (CTU), Solinova 7, 166 08 Prague 6, Czech Republic; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 117 - 124

The structural reliability recommended in Eurocodes and other international documents vary
within a broad range, while the reference to the failure consequences and design working life is
mentioned only very vaguely. In some cases the target reliability indexes are indicated for one or
two reference periods (in Eurocodes for 1 year and 50 years), however no explicit link to the design
working life is usually provided. This article attempts to clarify the relationship between the target
reliability levels, failure consequences, the design working life and the discount rate. The theoretical
study based on probabilistic optimization is supplemented by recommendations useful for code
makers and required by practicing engineers. It appears that the optimum reliability indices depend
primarily on the ratio of the cost of structural failure to the cost per unit of structural parameter, and
less significantly on the design working life and on the discount rate.

DOI: 10.22227/1997-0935.2012.11.117 - 124

Библиографический список
  1. EN 1990 (2002), “Eurocode — Basis of structural design”, CEN/TC 250, 2002.
  2. ISO 2394 (1998), “General principles on reliability for structures”, ISO, 1998.
  3. JCSS (2001) “Probabilistic Model Code”, http://www.jcss.ethz.ch/.
  4. Diamantidis D. (2009), “Reliability differentiation”, In.: Holicky et al.: Guidebook 1, Load effects on Buildings, CTU in Prague 2009.
  5. Holicky M, Schneider J. (2002), “Structural Design and Reliability Benchmark Study”, In.: Safety, Risk and Reliability — Trends in Engineering. IABSE International Conference, Malta.

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