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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect of Link Beam Length of the Eccentric Bracing System on Seismic Rehabilitation of Weak Reinforced Concrete Frames
    Autorzy:
    Niknam, Touraj
    Saberi, Hamid
    Saberi, Vahid
    Sadeghi, Abbasali
    Noroozinejad Farsangi, Ehsan
    Powiązania:
    https://bibliotekanauki.pl/articles/27314702.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    reinforced concrete frame
    link beam length
    renovation
    rama żelbetowa
    belka łącząca
    renowacja
    Opis:
    In this study, a reinforced concrete (RC) reference specimen with compressive strength of 250 kg/cm2 and the weak RC specimen for seismic rehabilitation with compressive strength of 150 kg/cm2 were examined in two types of structures with 6 and 12-stories. The link beam lengths of 50, 80, and 100 cm have been used in 6 and 12-stories prototypes under the effect of 7 earthquake records. The nonlinear dynamic analyses are performed. Then, The behavior of the link beam depends on its length. For short link beam lengths, shear behavior is serious, then for medium lengths, shear-flexural behavior is important, and finally, long lengths will have flexural behavior for the beam. In eccentrically braced frames, the details of the link beam and the fit of the other members must be done in such a way as to ensure its proper ductility. According to the obtained results, the performance of short link beams is much better than long link beams, and short link beams provide more energy dissipation and, at the same time, more ductility. Therefore, in the design of the link beam, mainly the shear of the link beam is considered as a ductile component. The axial force in the link beam, which is due to the application of lateral load to the structure, reduces both the bending capacity and the inelastic deformation capacity of the link beam, so it can be explained that in steel eccentric braces, the link beam is symmetrical between the two main components of the brace and it can affect the strength of the structure against lateral loads.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 1; 152--175
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shakedown of composite frames taking into account plastic and brittle fracture of elements
    Przystosowanie ram zespolonych z uwzględnieniem plastycznego i kruchego zniszczenia elementów
    Autorzy:
    Alawdin, P.
    Bulanov, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/396067.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    composite frame
    steel-and-concrete frame
    elastic-plastic elements
    destruction of elements
    limit load optimization
    mathematical model
    ramy zespolone
    ramy stalowo-betonowe
    elementy sprężysto-plastyczne
    zniszczenie elementów
    optymalizacja nośności granicznej
    model matematyczny
    Opis:
    In the paper the mathematical model of the optimization problem of limit and shakedown analysis for composite plane frames, containing elastic-plastic and brittle elements under low-cyclic loading, is proposed. It is assumed that the load varies randomly within the specified domain, and limited plastic redistribution of forces in such structures occurs. An example of the shakedown analyses of the composite frame is given.
    W pracy przedstawiono model matematyczny optymalizacji nośności granicznej i przystosowania płaskich ram zespolonych stalowo-betonowych, zawierających sprężysto-plastyczne i kruche elementy. Przyjęto, że obciążenie zmienia się w dowolny sposób w określonym obszarze. W takich konstrukcjach po obciążeniu niskocyklowym występuje ograniczone plastyczne wyrównanie sił wewnętrznych. Podano przykład analizy przystosowania ramy zespolonej.
    Źródło:
    Civil and Environmental Engineering Reports; 2014, 15; 5-21
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic behavior of a high-rise building under seismic loads for different bearing frame types
    Dynamiczne zachowanie się budynku wysokiego pod obciążeniem sejsmicznym dla różnych typów szkieletu budynku
    Autorzy:
    Sakharov, V.
    Lytvyn, O.
    Pidlutskyi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/395785.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bearing frame
    girder frame
    dynamic response
    seismic load
    modal analysis
    numerical methods
    soil base
    foundation
    high-rise building
    rama nośna budynku
    konstrukcja szkieletowa
    odpowiedź dynamiczna
    obciążenie sejsmiczne
    analiza modalna
    metody numeryczne
    podłoże gruntowe
    fundament
    budynek wysoki
    Opis:
    Paper presents the results of dynamic behavior analysis of a high-rise building under seismic loads as part of the “base-foundation-building” system. Analysis covers different types of reinforced concrete construction with girder frame and non-girder frame. Using modal analysis, paper presents differences in mode shapes and frequencies caused by the presence or absence of girders. Paper also demonstrates variations in the stress-strain state for the vertical bearing structures under the seismic load for different frame types.
    W artykule zostały przedstawione wyniki analizy dynamicznej zachowania się wielokondygnacyjnego budynku wysokiego pod obciążeniem sejsmicznym jako układu "podłoże gruntowe – fundament – budynek". Analiza obejmuje różne rodzaje konstrukcji szkieletowych z betonu zbrojonego o ramie nośnej z belkami wzmocnienia i bez nich. Wykorzystując analizę modalną, w artykule podane różnice we własnych formach i częstotliwościach dla różnych rodzajów szkieletu budynku. W prace również zostały wykazane zmiany w rozkładzie naprężeń w pionowych konstrukcjach nośnych budynku pod obciążeniem sejsmicznym w zależności od rodzaju szkieletu budynku.
    Źródło:
    Civil and Environmental Engineering Reports; 2018, No. 28(4); 180-189
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of buckling restrained braces to upgrade vertical stiffness of existing RC frames
    Autorzy:
    Niyonyungu, Ferdinand
    Noroozinejad Farsangi, Ehsan
    Powiązania:
    https://bibliotekanauki.pl/articles/395995.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    frame structure
    retrofitting
    vertical stiffeners
    restrained braces
    nonlinear analysis
    ramy żelbetowe
    modernizacja
    usztywnienie pionowe
    klamry
    analiza nieliniowa
    Opis:
    In this paper, based on the RC frame structure of an industrial building, the finite element model of the structure is developed, according to the Chinese code for seismic design of buildings [9]. Considering the lack of seismic performance, the buckling restrained brace (BRB) is adopted for seismic retrofitting, and various configurations of buckling restrained support are considered for reinforcement. The elastic response spectrum analysis (RSA) and direct integration nonlinear time history analyses (NL-TH) are carried out for the frame structure before and after reinforcement using ETABS finite element software. From the joints displacement, inter-story displacement, inter-story shear force, acceleration, energy dissipation, and other aspects of the seismic response of the strengthened structure and the non-strengthened structure, the comparison has been made. The effect of buckling restrained support and common support on the existing building structure is verified through analytical modeling. After reinforcement, there is a 40%, 39.3%, 40%, 36.4%, and 38.3% reduction in the first period of vibration after the building is strengthened by inverted BRB, V BRB, two-story BRB, single BRB, and ordinary steel braces, respectively. Strengthening of the structure by buckling restrained braces and ordinary steel braces both decrease the original building displacement by more than 50% from the first to the fourth floor. Under severe earthquakes, the use of BRB reduced the column shear by 46.6%; similarly, the incorporation of ordinary steel braces reduced the column shear by 4.72%. It is concluded that using buckling restrained braces will increase the vertical stiffness of the structure to a very high extent.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 3; 68-93
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Hall effect on MHD 2-fluid unsteady heat transfer flow of plasma in a rotating system via a straight channel between conducting plates
    Autorzy:
    Raju, T. Linga
    Rao, B. Venkata
    Powiązania:
    https://bibliotekanauki.pl/articles/2174207.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wymiana ciepła
    efekt Halla
    plazma
    unsteady flow
    MHD
    immiscible flow
    heat transfer
    Hall effect
    plasma
    rotating frame
    conducting plate
    Opis:
    Hall currents are used to investigate MHD unsteady two fluid flows and heat transport of plasma along a straight channel of conducting plates. In the two liquid zones, the velocity and temperature fields for the case of conducting side plates are obtained by solving the governing equations using a two-term series under the specified conditions. The distribution profiles are graphically resolved and examined. The distributions are thought to be dependent on the electron-to-total pressure ratio. The flow and heat transfer factors are also influenced by other parameters such as the Hartmann number, Hall parameter, rotation parameter, thermal conductivity and viscosity ratio.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 137--162
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A federated approach to parallel and distributed simulation of complex systems
    Autorzy:
    Sikora, A.
    Niewiadomska-Szynkiewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/911251.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie równoległe
    symulacja rozproszona
    modelowanie sieci komputerowych
    sieć rozległa
    parallel simulation
    distributed simulation
    federated simulators
    computer networks simulation
    frame relay
    Opis:
    The paper describes a Java-based framework called ASimJava that can be used to develop parallel and distributed simulators of complex real-life systems. Some important issues associated with the implementation of parallel and distributed simulations are discussed. Two principal paradigms for constructing simulations today are considered. Particular attention is paid to an approach for federating parallel and distributed simulators. We describe the design, performance and applications of the ASimJava framework. Two practical examples, namely, a simple manufacturing system and computer network simulations are provided to illustrate the effectiveness and range of applications of the presented software tool.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 99-106
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electro-magnetohydrodynamic two fluid flow of ionized-gases with hall and rotation effects
    Autorzy:
    Linga Raju, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174161.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    pole elektryczne
    plazma
    wymiana ciepła
    magnetic field
    electric field
    immiscible flow
    plasma
    Hall effect
    rotating frame
    heat transfer
    insulating plate
    Opis:
    An electro-magnetohydrodynamic (EMHD) two fluid flow and heat transfer of ionized gases through a horizontal channel surrounded by non-conducting plates in a rotating framework with Hall currents is investigated. The Hall effect is considered with an assumption that the gases are completely ionized and the strength of the applied transverse magnetic field is strong. The governing equations are solved analytically for the temperature and velocity distributions in two fluid flow regions. The numerical solutions are demonstrated graphically for various physical parameters such the Hartmann number, Hall parameter, rotation parameter, and so on. It was noticed that an increment is either due to the Hall parameter or the rotation parameter reduces the temperature in the two regions.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 128--144
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady electro-magneto hydrodynamic flow and heat transfer of two ionized fluids in a rotating system with Hall currents
    Autorzy:
    Raju, T. Linga
    Rao, B. Venkat
    Powiązania:
    https://bibliotekanauki.pl/articles/2174167.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transfer ciepła
    przepływ nieustalony
    plazma
    pole magnetyczne
    pole elektryczne
    unsteady flow
    magnetic field
    electric field
    immiscible flow
    plasma
    Hall effect
    rotating frame
    heat transfer
    insulating plate
    Opis:
    An unsteady flow and heat transmission of ionized gases via a horizontal channel enclosed by non-conducting plates in a rotating framework with Hall currents is examined using electro-magnetohydrodynamic (EMHD) two-fluid heat flow. The Hall current impact is taken into account by assuming that the gases are totally ionized, the applied transverse magnetic field is very strong. For temperature and velocity distributions in two-fluid flow regions, the governing equations are solved analytically. For numerous physical parameters such as the Hartmann number, Hall parameter, rotation parameter, viscosity ratio, and so on, numerical solutions are visually displayed. It was discovered that an increase in temperature in the two regions is caused by the thermal conductivity ratio. It was also realized that an increase in rate of heat transfer coefficient at the plates is caused by either the Hartman number or the Hall parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 125--145
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic performance evaluation of a proposed buckling-restrained brace for RC-MRFS
    Autorzy:
    Ebanesar, Arunraj
    Cruze, Daniel
    Noroozinejad Farsangi, Ehsan
    Seenivasan, Vinscent Sam Jebadurai
    Mohammad, Adil Dar
    Abdul Rashid, Dar
    Gladston, Hemalatha
    Powiązania:
    https://bibliotekanauki.pl/articles/396426.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    disasters seismic
    disasters mitigation
    buckling restrained brace
    EPS
    local buckling
    load test
    RC frame
    OpenSees
    katastrofy sejsmiczne
    skutki katastrof
    stabilizator zwalniający
    wyboczenie
    test obciążenia
    Rama RC
    Opis:
    This paper presents a novel buckling-restrained brace (BRB) where the inner core is restrained by a concrete infilled Expanded Polystyrene Sheet (EPS) instead of the conventional concrete infilled tube section, to resist inner core buckling. It serves two purposes, firstly, the EPS is a ductile material, which is favourable in terms of seismic performance and, secondly, the outer construction material has better corrosion resistance. Thus, the life of the steel core can be prolonged. In this study, 6 BRB specimens were prepared, of which 3 BRB specimens were infilled with concrete and the remaining 3 BRB specimens with concrete and EPSs, in order to study their performance under cyclic loading. Three different core heights, all with the same core thickness, were adopted. The test results indicate that the load-carrying capacity of this novel BRB is higher than the conventional BRB. Further, the length of the steel tube also affects the strength of the seismic disaster mitigation system. Lastly, a numerical study on a single bay RC frame, with and without BRB subjected to time history analysis, was conducted to check the global performance of this novel system. It was found that the structural responses had substantially decreased.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 164-173
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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