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    Tytuł:
    Stress-strain state of damaged reinforced concrete bended elements at operational load level
    Autorzy:
    Kopiika, Nadiia
    Vegera, Pavlo
    Vashkevych, Rostyslav
    Blikharskyy, Zinoviy
    Powiązania:
    https://bibliotekanauki.pl/articles/23967534.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    korozja
    pręt stalowy
    belki o rzeczywistych wymiarach
    uszkodzone belki
    corrosion
    steel rebar
    real size beams
    damaged beams
    Opis:
    Each structure is exposed to different influences during operation. As a result, there are various defects and damages of these elements that affect their safe operation. The article presents the results of experimental studies of reinforced concrete beams with damages to stretched reinforcement made with and without initial load application. As the damages were accepted one or five Ø5.6 mm holes. In one case, the damage was made until the beam destruction (up to the 8.4 mm opening) Control samples of both series were destroyed due to crushing of the compressed zone of concrete. Samples that were damaged without initial loading collapsed due to rupture of the stretched reinforcement. The same type of failure was identified for damages at the operational load level.
    Źródło:
    Production Engineering Archives; 2021, 27, 4; 242--247
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison crack resistance of RC beams with and without transverse reinforcement after shear testing
    Autorzy:
    Vegera, Pavlo
    Khmil, Roman
    Vashkevych, Rostyslav
    Blickharskyy, Zinoviy
    Powiązania:
    https://bibliotekanauki.pl/articles/104011.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    RC beam
    crack resistant
    shear
    composite material
    FRCM
    belka RC
    odporność na pękanie
    ścinanie
    materiał kompozytowy
    Opis:
    Main parameters, which characterize shear strength, are crack distribution, width of diagonal crack opening and angle of inclined crack. There are in this article, comparison crack resistant of testing reinforced concrete (RC) beams on the shear with such variable parameters like presence or absence internal reinforcement, different shear span, and presence or absence external composite reinforcement. Shear span (relative span to effective depth ratio) was acquired the following values: a/d=2, 1.5, 1. For internal reinforcement, rebar’s A240C with diameter 8 mm and steps 100 mm was chosen. The composite FRCM system was like external reinforcement with three stripe of composite fabric with width 70 mm and step 100 mm. Eight RC beams were tested. After testing, we discovered that the most influenced on the serviceability capacity was shear span. Internal transverse reinforcing increased shear strength on the same level and it was independent from shear span and other factors. Only quantity of reinforcing determine level of increasing shear capacity. FRCM system is efficient strengthening system, which significant increase shear crack resistant for RC beams. External FRCM reinforcing increase shear crack resistance on the same percentage and independent from presence or absence internal reinforcement.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 342-349
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement method of calculation reinforced concrete beams on the shear strengthened FRCM system
    Autorzy:
    Blikharskyy, Zinoviy
    Vegera, Pavlo
    Vashkevych, Rostyslav
    Khmil, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/88486.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    reinforced concrete beam
    shear
    shear span
    FRCM strengthening
    calculation
    belka żelbetowa
    ścinanie
    system FRCM
    zbrojenie kompozytowe
    nośność konstrukcji
    trwałość konstrukcji
    Opis:
    Determination of shear-load-bearing capacity of reinforced concrete beams (according to the current normative documents), comprises particular recommended values, which do not depend on the parameters of the sample or load. This article de-scribes the methodology for determination the shear strength with suggestions for calculation the coefficient CRd,c and compressed element tilt angle Ѳ while reinforced concrete elements` calculation with the use of “truss model”. In order to confirm the methodology 4 reinforced concrete beams were tested. Tests were performed in order to investigate each particular inclined section separately. Variable parameter was the relative shear span a/d, with its values a/d=2, a/d=1,5 and a/d=1. Another parameter was the usage of composite strengthening system, made for relative shear span a\d=2. Samples were tested as single-span beams subjected to short-term loading. The calculation with the use only the values, given in norms showed significant divergence of results. Using the refined parameter values provided the convergence of results within 16-29% toward overestimation of the experimental data. The composite reinforcement system calculation showed the overestimation of 23%, which is within the same limits as for the control samples.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 215-222
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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