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Wyszukujesz frazę "stochastic finite element" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Computer analysis of dynamic reliability of some concrete beam structure exhibiting random damping
    Autorzy:
    Bredow, R.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839888.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza niezawodności
    metoda elementów skończonych
    drgania wymuszone
    reliability analysis
    spectral stochastic finite element method
    generalized stochastic perturbation technique
    forced vibrations
    Runge-Kutta-Fehlberg method
    Opis:
    An efficiency of the generalized tenth order stochastic perturbation technique in determination of the basic probabilistic characteristics of up to the fourth order of dynamic response of Euler-Bernoulli beams with Gaussian uncertain damping is verified in this work. This is done on civil engineering application of a two-bay reinforced concrete beam using the Stochastic Finite Element Method implementation and its contrast with traditional Monte-Carlo simulation based Finite Element Method study and also with the semi-analytical probabilistic approach. The special purpose numerical implementation of the entire Stochastic perturbation-based Finite Element Method has been entirely programmed in computer algebra system MAPLE 2019 using Runge-Kutta-Fehlberg method. Further usage of the proposed technique to analyze stochastic reliability of the given structure subjected to dynamic oscillatory excitation is also included and discussed here because of a complete lack of the additional detailed demands in the current European designing codes.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 45-64
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bridges for pedestrians with random parameters using the stochastic finite elements analysis
    Autorzy:
    Szafran, J.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/266214.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bridges for pedestrians
    eigenfrequencies
    stochastic finite element method
    response function method
    generalized stochastic perturbation technique
    reliability analysis
    mosty dla pieszych
    metoda elementów skończonych
    analiza niezawodności
    Opis:
    The main aim of this paper is to present a Stochastic Finite Element Method analysis with reference to principal design parameters of bridges for pedestrians: eigenfrequency and deflection of bridge span. They are considered with respect to random thickness of plates in boxed-section bridge platform, Young modulus of structural steel and static load resulting from crowd of pedestrians. The influence of the quality of the numerical model in the context of traditional FEM is shown also on the example of a simple steel shield. Steel structures with random parameters are discretized in exactly the same way as for the needs of traditional Finite Element Method. Its probabilistic version is provided thanks to the Response Function Method, where several numerical tests with random parameter values varying around its mean value enable the determination of the structural response and, thanks to the Least Squares Method, its final probabilistic moments.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 175-197
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilistic buckling analysis of the beam steel structures subjected to fire by the stochastic finite element metho
    Autorzy:
    Świta, P.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/266160.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza stabilności
    symulacja pożaru
    metoda elementów skończonych
    analiza niezawodności
    stability analysis
    linearized buckling
    stochastic perturbation method
    stochastic finite element method
    response function method
    reliability analysis
    Opis:
    The main purpose is to present the stochastic perturbation-based Finite Element Method analysis of the stability in the issues related to the influence of high temperature resulting from a fire directly connected with the reliability analysis of such structures. The thin-walled beam structures with constant cross-sectional thickness are uploaded with typical constant loads, variable loads and, additionally, a temperature increase and we look for the first critical value equivalent to the global stability loss. Such an analysis is carried out in the probabilistic context to determine as precisely as possible the safety margins according to the civil engineering Eurocode statements. To achieve this goal we employ the additional design-oriented Finite Element Method program and computer algebra system to get the analytical polynomial functions relating the critical pressure (or force) and several random design parameters; all the models are state-dependent as we consider an additional reduction of the strength parameters due to the temperature increase. The first four probabilistic moments of the critical forces are computed assuming that the input random parameters have all Gaussian probability functions truncated to the positive values only. Finally, the reliability index is calculated according to the First Order Reliability Method (FORM) by an application of the limit function as a difference in-between critical pressure and maximum compression stress determined in the given structures to verify their durability according to the demands of EU engineering designing codes related to the fire situation.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 485-510
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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