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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of the percentage of reinforcement by un-stressed rebar on the deformability of pre-stressed RC beams
    Autorzy:
    Blikharskyy, Yaroslav
    Selejdak, Jacek
    Bobalo, Taras
    Khmil, Roman
    Volynets, Myhailo
    Powiązania:
    https://bibliotekanauki.pl/articles/23965519.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wzmocnienie
    belka RC
    próbki w rzeczywistym rozmiarze
    wyniki eksperymentalne
    pre-stressed
    reinforcement
    RC beam
    real size samples
    experimental results
    Opis:
    This article presents the materials of deformability studies of pre-stressed steel-concrete beams reinforced with a package of reinforcement with different ratio of tape and rebar in the pure bending moment zone. The aim of the research was determination of the reinforcement percentage influence, for pre-stressed reinforced concrete beams reinforced with a package of reinforcement on their deformability. Also, the aim was to evaluate the effectiveness of using pre-stressed rebar in combined reinforcement. The practical significance of the experimental research is to study the deformability in pre-stressed bending elements with external tape and rebar reinforcement, taking into account the influence of different ratios of reinforcement areas within the combined reinforcement and development of proposals for such structures` calculation and design. The scientific novelty of the research is in obtaining the deformability characteristics of reinforced concrete beams reinforced with a package of reinforcement (tape and steel bars with periodic profile) with different ratios in the case of static loads` action.
    Źródło:
    Production Engineering Archives; 2021, 27, 3; 212--216
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crack Resistance of RC Columns Strengthened by CFRP under 30% of Uls Loading
    Autorzy:
    Blikharskyy, Yaroslav
    Khmil, Roman
    Selejdak, Jacek
    Katunský, Dušan
    Tytarenko, Roman
    Blikharskyy, Zinoviy
    Powiązania:
    https://bibliotekanauki.pl/articles/27323568.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    CFRP strip
    crack resistance
    strengthening
    initial load level
    RC column
    Pasek CFRP
    odporność na pękanie
    wzmacnianie
    początkowy poziom obciążenia
    Kolumna RC
    Opis:
    Nowadays, among many existing reinforced concrete (RC) columns, it is impossible to find samples that work only as centrally compressed members – their vast majority work as eccentrically compressed members. On the other hand, the significant volumes of reconstruction in Ukraine will require studies of the work of various RC structures strengthened under different load levels. In addition to choosing the method of strengthening itself, the relevant tasks will be studies of bearing capacity, crack resistance, reliability (including residual resource) of structures, etc. This article presents the method of crack resistance experimental study of eccentrically compressed RC members. The proposed method was tested on unstrengthened (ordinary) and strengthened (in a stretched zone) RC columns; the results of experimental studies for ordinary and strengthened samples were also obtained. The columns were strengthened with a composite material (from many carbon-fiber-reinforced polymers) – the Sika Carbodur S512 strip. The feature of the crack resistance study of columns was that they were strengthened under the initial load level of 30 %. As a result of experimental research on the samples strengthened under load, we stated that the width of the crack decreased on average by about 36 % (at the comparable values of the active load). In turn, the average maximum length of cracks decreased to about 50 % of the height of the cross-section (for unstrengthened samples, this value was approximately 80 %), and the eccentric compressive ultimate load was increased by about 33 %.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2023, 5, 1; 36-45
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of stress-strain state of steel-concrete beams with combined reinforcemenent
    Autorzy:
    Selejdak, Jacek
    Bobalo, Taras
    Blikharskyy, Yaroslav
    Dankevych, Iryna
    Powiązania:
    https://bibliotekanauki.pl/articles/26081279.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wzmocnienie łączone
    pręty zbrojeniowe o wysokiej wytrzymałości
    konstrukcje stalowo-betonowe
    projektowanie konstrukcji żelbetowych
    wzmocnienie zewnętrzne
    combined reinforcement
    high-strength rebar
    steel-concrete structures
    design of RC structures
    external reinforcement
    Opis:
    Most of the modern computer software for the building structures` calculation is based on mathematical dependencies which make it possible to analyse rather complex stress-strain state of structures subjected to loading. As a rule, the calculation is based on the finite element method and is reduced to the calculation of deformations arising in structures due to the action of external forces with the use of real strain diagrams of materials, σ-ε diagrams for concrete and reinforcement. Modern normative regulations for reinforced concrete structures` calculation are also based on the deformation model using material deformation diagrams, which are as close to the real ones, as possible. Therefore, this study was aimed to investigate in more detail the stress-strain state and the physical essence of the processes occurring in reinforced concrete structures with combined reinforcement according to mathematical approaches and regulations of DBN B.2.6-98:2009 and DSTU B. In 2.6-156:2010. Namely, in the research is analysed the combined reinforcement of S245 steel tapes and A1000 rebar, which is used in the production of reinforced concrete elements. The results of mathematical modelling were compared with the calculation results, according to DBN B.2.6-98: 2009 and DSTU B. B 2.6-156:2010, as well as with field experimental data. Therefore, the conclusion could be made, whether it is possible to use this technique with sufficient accuracy to calculate reinforced concrete structures with combined reinforcement.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 108--115
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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