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    Wyświetlanie 1-6 z 6
    Tytuł:
    Limit load solutions for SEN(T) specimens – 2D and 3D problems
    Autorzy:
    Graba, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/266083.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    dopuszczalne obciążenie
    ocena wytrzymałości
    pęknięcia
    SEN(T)
    limit loads
    FEM
    fracture
    Opis:
    This paper deals with the limit load solutions for SEN(T) specimens under plane stress and plane strain conditions. The existing solutions are verified using the Finite Element Method and extended to 3D cases. The numerical results can be used to assess the strength of a structural element with a defect. This paper is a verification and extension of the author’s previous paper.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 569-580
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The fundamental solutions for the stress intensity factors of modes I, II and III. The axially symmetric problem
    Autorzy:
    Rogowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/266303.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    cracks
    Green's functions
    stress intensity factors
    analytical solution
    transversely isotropic
    pęknięcia
    funkcje Greena
    naprężenia
    Opis:
    The subject of the paper are Green’s functions for the stress intensity factors of modes I, II and III. Green’s functions are defined as a solution to the problem of an elastic, transversely isotropic solid with a penny-shaped or an external crack under general axisymmetric loadings acting along a circumference on the plane parallel to the crack plane. Exact solutions are presented in a closed form for the stress intensity factors under each type of axisymmetric ring forces as fundamental solutions. Numerical examples are employed and conclusions which can be utilized in engineering practice are formulated.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 345-372
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Tests of the Vector II Slab in Field Conditions, Slab and Strip Model
    Autorzy:
    Zając, Jakub
    Drobiec, Łukasz
    Jasiński, Radosław
    Wieczorek, Mirosław
    Kisiołek, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1838083.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    crack pattern
    flexural analysis
    interface
    precast
    slab
    short-term load
    pęknięcia
    zginanie
    prefabrykaty
    płyty
    obciążenie krótkotrwałe
    Opis:
    Vector II slab was tested on a natural scale (a slab with a dimension of 6.30 × 6.30 m) and a strip 6.30 m long and 1.20 m wide. The Vector II slab is built by precast panel 60 cm wide, 4 cm thick and 14-20 cm thick concrete overtopping on the construction site. The main purpose of the slab tests on a natural scale was to observe the "faulting" effect and temporary deflections. During the tests, the displacements in the area of the panel joints in the middle of the slab span were recorded. The maximum difference in displacement between adjacent panels of the slab model was 0.16 mm, and the vertical displacement was 1.9 mm. The strip model had no cracks that could indicate a interface cracks between the precast element and the concrete overlay. After completion of the field tests, the load was left on the slab model to verify long-term effects.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 1; 54-69
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Tests of the Vector II Slab in Field Conditions, Slab and Strip Model
    Autorzy:
    Zając, Jakub
    Drobiec, Łukasz
    Jasiński, Radosław
    Wieczorek, Mirosław
    Kisiołek, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1838085.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    crack pattern
    flexural analysis
    interface
    precast
    slab
    short-term load
    pęknięcia
    zginanie
    prefabrykaty
    płyty
    obciążenie krótkotrwałe
    Opis:
    Vector II slab was tested on a natural scale (a slab with a dimension of 6.30 × 6.30 m) and a strip 6.30 m long and 1.20 m wide. The Vector II slab is built by precast panel 60 cm wide, 4 cm thick and 14-20 cm thick concrete overtopping on the construction site. The main purpose of the slab tests on a natural scale was to observe the "faulting" effect and temporary deflections. During the tests, the displacements in the area of the panel joints in the middle of the slab span were recorded. The maximum difference in displacement between adjacent panels of the slab model was 0.16 mm, and the vertical displacement was 1.9 mm. The strip model had no cracks that could indicate a interface cracks between the precast element and the concrete overlay. After completion of the field tests, the load was left on the slab model to verify long-term effects.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 1; 54-69
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predicting changes of the state of a bridge reinforced with concrete superstructures in view of operational changes
    Autorzy:
    Ovchynnykov, Pavlo
    Dubinchyk, Olha
    Tiutkin, Oleksii
    Kildieiev, Vitalii
    Sedin, Volodymyr
    Bikus, Kateryna
    Powiązania:
    https://bibliotekanauki.pl/articles/395920.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bridge
    superstructure
    reinforced concrete
    reinforcement
    concrete creep
    cracks
    corrosion depth
    most
    zbrojenia
    beton wzmocniony
    wzmocnienie
    pełzanie betonu
    pęknięcia
    korozja
    Opis:
    To solve the problem of predicting the service life of superstructures, this work proposes the basis and methodological developments of creep theory with increasing loads as well as regression analysis of the results of laboratory experiments. The main limitation in terms of reinforcement is corrosion in the concrete cracks, which was determined during laboratory experiments. Based on the results, the approximate analytical dependences concerning reinforcement corrosion depth change over time at a constant value of crack width were selected. The paper substantiates the validity of the analytical dependences as a result of regression analysis; it proposes formulae for determining the corrosion rate of rebars in reinforced concrete superstructures. The obtained analytical dependences allowed for the developing of a process for predicting changes to the state of the superstructure in light of operational changes.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 134-152
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative laboratory investigation into the role of geosynthetics in the initial swell control of an expansive soil
    Autorzy:
    James, Jijo
    Vijayasimhan, Sivapriva
    Srinivasan, Hemavathi
    Arulselvan, Javasri
    Purushothaman, Sathya
    Paramasivam, Murali
    Powiązania:
    https://bibliotekanauki.pl/articles/396104.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    swell of soil
    expansive soil
    volume change in soils
    geosynthetic materials
    layering
    comparative investigation
    pęknięcia
    gleba
    zmiana objętości
    materiały geosyntetyczne
    warstwy
    badania porównawcze
    Opis:
    Volume change in expansive soils due to the intervention of water causes swell. A laboratory investigation using two different geosynthetic materials was designed to minimise the swell characteristics. The influence of three parameters, being geosynthetic material [Secutex (ST) and Combigrid (CG)], orientation (horizontal and vertical), and number of layers (1, 2, and 3) on the swell of an expansive soil was studied to better understand the potential for geosynthetics in swell control. The study on the immediate swell characteristics (limited to 24 hours) helps in gaining confidence in the use of geosynthetics in the swell control of expansive soils. From the investigation results, it was found that all three parameters, being type of material, orientation, and number of layers influenced the swell control of the soil. When two layers of ST and CG were placed both vertically and crossed, they reduced the swell of the virgin soil by almost 60% and 44%, respectively. It can, therefore, be concluded that geosynthetics can play an effective role in the swell control of expansive soils.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 4; 18-40
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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