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Wyszukujesz frazę "Kamiński, M. M." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    The least squares stochastic finite element method in structural stability analysis of steel skeletal structures
    Autorzy:
    Kamiński, M.
    Szafran, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/265364.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    weighted least squares method
    stochastic finite element method
    generalized stochastic perturbation technique
    stability problems
    steel skeletal structures
    technika zaburzeń
    konstrukcja szkieletowa
    analiza stabilności
    Opis:
    The main purpose of this work is to verify the influence of the weighting procedure in the Least Squares Method on the probabilistic moments resulting from the stability analysis of steel skeletal structures. We discuss this issue also in the context of the geometrical nonlinearity appearing in the Stochastic Finite Element Metod equations for the stability analysis and preservation of the Gaussian probability density function employed to model the Young modulus of a structural steel in this problem. The weighting procedure itself (with both triangular and Dirac-type) shows rather marginal influence on all probabilistic coefficients under consideration. This hybrid stochastic computational technique consisting of the FEM and computer algebra systems (ROBOT and MAPLE packages) may be used for analogous nonlinear analyses in structural reliability assessment.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 299-318
    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
    Tytuł:
    FEM study of a steel corrugated web plate girder subjected to fire
    Autorzy:
    Sokołowski, D.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839880.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konstrukcja stalowa
    symulacja pożaru
    metoda elementów skończonych
    steel structures
    finite element method
    corrugated web plate girders
    fire simulation
    Opis:
    The main aim of this work is a computational nonlinear analysis of a high strength steel corrugated-web plate girder with a very detailed and realistic mesh including vertical ribs, all the fillet welds and supporting areas. The analysis is carried out to verify mechanical structural response under transient fire temperature conditions accounting for an efficiency and accuracy of three various transient coupled thermo-elastic models. All the resulting stress distributions, deformation modes and their time variations, critical loads and eigenfrequencies as well as failure times are compared in all these models. Nonlinearities include material, geometrical and contact phenomena up to the temperature fluctuations together with temperature-dependent constitutive relations for high strength steel. They result partially from steady state and transient experimental tests or from the additional designing rules included in Eurocodes. A fire scenario includes an application of the normative fire gas temperature curve on the bottom flange of the entire girder for a period of 180 minutes. It is computed using sequentially coupled thermo-elastic Finite Element Method analyses. These account for heat conductivity, radiation and convection. The FEM model consists of a combination of 3D hexahedral and tetrahedral solid finite elements and uses temperature-dependent material and physical parameters, whose values are taken after the experiments presented in Eurocodes. Numerical results presented here demonstrate a fundamental role of the lower flange in carrying fire loads according to this scenario and show a contribution of the ribs and of the welds to the strength of the entire structure.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 201-218
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Various response functions in lattice domes reliability via analytical integration and finite element method
    Autorzy:
    Pokusiński, B.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265441.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konstrukcja kratowa
    analiza niezawodności
    metoda najmniejszych kwadratów
    response function method
    semi-analytical probabilistic technique
    lattice dome structures
    reliability analysis
    weighted least squares method
    Opis:
    The main aim of this work is to verify an influence of the response function type in direct symbolic derivation of the probabilistic moments and coefficients of the structural state variables of axisymmetric spherical steel dome structures. The second purpose is to compare four various types of domes (ribbed, Schwedler, geodesic as well as diamatic) in the context of time-independent reliability assessment in the presence of an uncertainty in the structural steel Young modulus. We have considered various analytical response functions to approximate fundamental eigenfrequencies, critical load multiplier, global extreme vertical and horizontal displacements as well as local deformations. Particular values of the reliability indices calculated here can be of further assistance in the reliability assessment by comparing the minimal one with its counterpart given in the Eurocode depending upon the durability class, reference period and the given limit state type.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 445-469
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic critical moment for bisymmetric steel profiles and its sensitivity by the finite difference method
    Autorzy:
    Kamiński, M.
    Supeł, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/265535.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    moment krytyczny
    konstrukcja murowana
    metoda elementów skończonych
    critical moment
    finite difference method
    sensitivity analysis
    thin walled structures
    finite element method
    Opis:
    It is widely known that lateral-torsional buckling of a member under bending and warping restraints of its cross-sections in the steel structures are crucial for estimation of their safety and durability. Although engineering codes for steel and aluminum structures support the designer with the additional analytical expressions depending even on the boundary conditions and internal forces diagrams, one may apply alternatively the traditional Finite Element or Finite Difference Methods (FEM, FDM) to determine the so-called critical moment representing this phenomenon. The principal purpose of this work is to compare three different ways of determination of critical moment, also in the context of structural sensitivity analysis with respect to the structural element length. Sensitivity gradients are determined by the use of both analytical and the central finite difference scheme here and contrasted also for analytical, FEM as well as FDM approaches. Computational study is provided for the entire family of the steel I- and H - beams available for the practitioners in this area, and is a basis for further stochastic reliability analysis as well as durability prediction including possible corrosion progress.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 37-59
    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:
    Coupled finite volume and finite element method analysis of a complex large-span roof structure
    Autorzy:
    Szafran, J.
    Juszczyk, K.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264364.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Finite Volume Method
    CFD simulation
    finite element method
    wind engineering
    metoda elementów skończonych
    inżynieria wiatrowa
    metoda objętości skończonych
    Opis:
    The main goal of this paper is to present coupled Computational Fluid Dynamics and structural analysis for the precise determination of wind impact on internal forces and deformations of structural elements of a longspan roof structure. The Finite Volume Method (FVM) serves for a solution of the fluid flow problem to model the air flow around the structure, whose results are applied in turn as the boundary tractions in the Finite Element Method problem structural solution for the linear elastostatics with small deformations. The first part is carried out with the use of ANSYS 15.0 computer system, whereas the FEM system Robot supports stress analysis in particular roof members. A comparison of the wind pressure distribution throughout the roof surface shows some differences with respect to that available in the engineering designing codes like Eurocode, which deserves separate further numerical studies. Coupling of these two separate numerical techniques appears to be promising in view of future computational models of stochastic nature in large scale structural systems due to the stochastic perturbation method.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 995-1017
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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