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Wyszukujesz frazę "Gremza, G." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Analiza efektywności wzmocnienia ściskanego pręta z kątownika drugim kątownikiem
    Analysis of the strengthening effectiveness of angle member by addition of the second one
    Autorzy:
    Gremza, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2067980.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    konstrukcje stalowe
    wzmocnienie
    imperfekcje
    nośność
    steel structures
    strengthening
    imperfections
    bearing capacity
    Opis:
    W artykule przeanalizowano efektywność wzmocnienia kątownika przez dodanie dodatkowego elementu, mocowanego do elementu wzmacnianego w wybranych punktach. Siłę w węzłach końcowych przykładano do pręta wzmacnianego, co wynika z rozwiązań często stosowanych w praktyce. Pojedynczy pręt z imperfekcją łukową obciążano przed wzmocnieniem siłą osiową mniejszą od jego nośności. W analizie nośności pręta złożonego powstałego na skutek dodania dodatkowej gałęzi uwzględniono wspomniane obciążenie wstępne w chwili wzmocnienia, mimośrodowość przyłożenia obciążenia, podatność połączeń oraz możliwość uwzględnienia uplastycznienia przekroju w kątowniku pierwotnym (wzmacnianym). Oszacowane wartości nośności porównano z nośnością pręta wykonanego od początku jako złożony i obciążony mimośrodowo. Określono wstępnie proponowany obszar prac badawczych w omawianym w artykule zakresie.
    In this article effectiveness of strengthening of angle member by use of additional “new” member that is attached to the “old” member in selected points was analysed. The loading force was applied at the end points of “old” member intended to be strengthened. This way of load application is a result of the solutions commonly used in practice. Single bar with initial bow imperfection was loaded before strengthening with axial force lower than its load capacity. In the presented analysis of built-up member formed thanks to new branch addition, the aforementioned initial loading force was included as well as load eccentricity, joint flexibility and plasticization of cross-section of strengthened angle. Estimated load capacities were compared with load capacity of a member that was initially prefabricated as a built-up member, eccentrically loaded. An experimental research program including problems mentioned in this article was initially mentioned.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2017, 23 (173); 86-102
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of load capacity of roof trusses with imperfections and the issue of equivalent load adoption
    Problem właściwego przyjmowania obciążenia zastępczego w dachu z imperfekcjami
    Autorzy:
    Gremza, G.
    Zamorowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084028.pdf
    Data publikacji:
    2020
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    truss imperfections
    equivalent load
    2nd order analysis
    limit state
    Opis:
    The internal forces and stresses were analyzed and utilization of the design resistance in selected members of the roof structure with local and global geometrical imperfections was evaluated. Values of these imperfections were based on the information given in the standards EN 1090-2 and EN 1993-1-1. Besides the basic reference model with imperfections, models without imperfections, with different equivalent load arrangements by the authors’ own concept and comparatively according to the standard EN 1993-1-1 were analyzed. The calculations were made using the 1st and the 2nd order analysis. Conclusion concerning accuracy of the internal forces estimation and limit states check by use the equivalent load system proposed in the standard EN 1993-1-1 are presented. Deficiencies in the provisions of this standard in terms of adopting equivalent loads in roof structures with imperfections, resulting in underestimation of the stresses in the bottom chords of the roof trusses, has been demonstrated.
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2021, 20, 1; 65-76
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Design of a Steel End-Plate Beam-to-Column Bolted Joint According to PN-EN 1993-1-8
    Autorzy:
    Zamorowski, J.
    Gremza, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/104835.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    component method
    equivalent T-stub
    joint capacity
    joint stiffness
    Opis:
    Considering joints with unstiffened columns, the load capacity of an inner bolt-row being a part of bolts group defined by a flange capacity is directly proportional to a distance between bolts. In turn, a flexibility of the column flange in the inner bolt-row area depends not only on that distance but also on a flexibility of other basic joint components. Hence, that situation may occur, when internal forces in inner bolt-row will be greater than its capacity estimated as an equivalent of T-stub. This possibility has been taken into account in the standard [3] - see the rule in the point 6.2.4.2 (3). In practice, this rule is not implemented in calculations of this kind of joints. In this work, a simplified algorithm of these joints calculation as well as an example, where the need for force reduction in the inner bolt-row to the value of bolt resistance has occurred, were presented. Moreover, the influence of the aforementioned reduction on the joint stiffness was estimated.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 187-196
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Damage Analysis of the Blade to the Rotor Hub Connection in the Wind Turbine
    Autorzy:
    Gremza, G.
    Zamorowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/104789.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    undersized bolts
    mechanical properties
    bolts
    wind turbine
    blade failures
    model of joint
    Opis:
    The paper analyzes possible causes of bolts fracture in the connection of the blade to the hub of the wind turbine rotor. This failure has been growth shortly after the wind turbine was started, a few days after the storm. During the storm, electric power was turned off in the whole surrounding area for many hours, therefore it was impossible to control the device. After an initial analysis of failure modes in other wind turbines, it was found, that the bolts failure in the analysed case may be regarded as quite rare. Due to the fact that a significant part of bolts was broken brittle (flat fracture surfaces and lack of permanent elongation), it was decided to analyse the structure of the material in the direction of stress corrosion and hydrogen embrittlement. Among others, microscope analysis of fracture surfaces after their proper cleaning from corrosion products was carried out. The broken bolts were made as undersized, what is mainly used in fasteners intended for hot-dip galvanizing. On the basis of the purchase documentation analysis, it was presumed that the bolts were not galvanized by their manufacturer, which is obliged to perform the routine inspection in production process preventing the introduction of the hydrogenated bolts into the market. Besides the bolts examination, the scenarios of connection loads in extreme situations, in particular the impact of wind with high energy in the most unfavourable direction relative to the blade and nacelle, as well as the force resulting from the impact of the rotating blade on the tower that preceded the collapse of the whole structure, were considered. Conclusions from the performed tests and calculations by use of two calculation models of the connection were presented.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 55-67
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A system consists of lifted steel tank and four assembly supports with variable assembly conditions
    Autorzy:
    Zamorowski, J.
    Gremza, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/178929.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tank
    method of erection
    hydraulic jacking
    disaster
    Opis:
    In the method of steel tank erection, consisting in assembling the roof and the next courses (segments) of the shell at the ground level, starting from the top one (the so-called hydraulic jacking-up method), the assembled part of the tank is lifted using assembly supports (towers, trestles), hydraulic jacks and ropes. Supports are located inside or outside the tank, and their bases are usually not anchored. During the assembly work, numerous contaminations can appear under the bases of the supports; therefore, boundary conditions of the system consisting of the elevated tank and assembly supports may change, influencing the field of displacements and stresses in the elements of this system. This article presents the results of numerical tests of an exemplary mounted tank – mounting support system – at various possible coefficients of friction between the bases of the supports and the ground. The influence of the support conditions on the effort of the essential elements of the system was assessed. Calculation difficulty was noted to determine the directions of horizontal responses of the supports. It was assumed that these directions did not change after exceeding the values of the friction forces. The analysed tank collapsed during its erection.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 4; 263-269
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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