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    Wyświetlanie 1-7 z 7
    Tytuł:
    Concentric Vs. Eccentric Loading on Different Shapes of CFST Columns: A Theoretical Investigation on Axial Compressive Strength According to AISC Guidelines
    Autorzy:
    Rubieyat, Bin Ali
    Islam, Md. Mofizul
    Powiązania:
    https://bibliotekanauki.pl/articles/1177805.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Confinement effect
    bearing capacity and axial compressive strength
    Opis:
    The Steel-concrete composite column can be an effective solution for any type of civil engineering construction instead of bare concrete or bare steel column because of having a good confinement effect between steel and concrete. Four types of shapes (square, rectangular, circular and elliptical) are chosen to find out their bearing capacity and axial compressive strength according to AISC (2010) guidelines. It is tried to make differences between these shapes. And it is also tried to keep the same cross-sectional dimension in the area of each shape. The main features which are found from this investigation are that circular shape has a good confinement effect and cost-effective than other shapes. Though the capacity of the square shape of CFST column is better than circular but it loses its confinement effect because of having sharp edges. And a square type of shape is suitable for easy connection. On the other hand, rectangular shape is better than elliptical shape.
    Źródło:
    World Scientific News; 2018, 99; 119-132
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand
    Autorzy:
    Gupta, Sujata
    Mital, Anupam
    Powiązania:
    https://bibliotekanauki.pl/articles/1845170.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    eccentric loading
    load inclination
    ultimate bearing capacity
    UBC
    rectangular footing
    geogrid
    Opis:
    This study presents the behaviour of model footing resting over unreinforced and reinforced sand bed under different loading conditions carried out experimentally. The parameters investigated in this study includes the number of reinforced layers (N = 0, 1, 2, 3, 4), embedment ratio (Df/B = 0, 0.5, 1.0), eccentric and inclined ratio (e/L, e/B = 0, 0.05, 0.10, 0.15) and (a = 0°, 7°, 14°). The test sand was reinforced with bi-axial geogrid (Bx20/20). The test results show that the ultimate bearing capacities decrease with axial eccentricity and inclination of applied loads. The test results also show that the depth of model footing increase zero to B (B = width of model footing), an increase of ultimate bearing capacity (UBC) approximated at 93%. Similarly, the multi-layered geogrid reinforced sand (N = 0 to 4) increases the UBC by about 75%. The bearing capacity ratio (BCR) of the model footing increases with an increasing load eccentricity to the core boundary of footing; if the load eccentricities increase continuity, the BCR decreases. The tilt of the model footing is increased by increasing the eccentricity and decreases with increasing the number of reinforcing layers.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 2; 74-89
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Properties of Concrete Composite Panels under Eccentric Compression Loading Tests
    Autorzy:
    Magalhaes, M.
    Silva, R. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176872.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic analysis
    composite panels
    in-plane loading
    pre-stressed panels
    Opis:
    The main aim of this paper is to examine the variability of some dynamic properties of concrete composite panels to in-plane eccentric compression loads via static and dynamic impact testing. First, experimental tests were performed in order to obtain the dynamic and static properties of concrete composite panels. In-plane eccentric loads were statically applied to a couple of panels in ten uniform steps. For each step, dynamic impact testing was performed and the modal damping, peak amplitude and natural frequencies obtained. Second, a ‘hybrid’ model, based on the concepts of modal analysis and the Finite Element Method, was developed in order to obtain the natural frequencies and corresponding normal modes of the composite panels within the frequency range 0–200 Hz. For this model, an initial warp of the panel middle surface was incorporated into the formulation in order to represent the applied flexural moment provoked by the eccentric in-plane loads. The accuracy of the ‘hybrid’ model was verified by comparison with the experimental results. Third, comparison is made between predictions (using on the ‘hybrid’ model) and experimental results.
    Źródło:
    Archives of Acoustics; 2015, 40, 2; 169-181
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dyskusja i kalibracja hipotezy Meyerhofa
    Discussion and calibration of the Meyerhof hypothesis
    Autorzy:
    Brząkała, W.
    Blanc, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/350370.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fundament bezpośredni
    nośność
    obciążenie mimośrodowe
    cząstkowe współczynniki bezpieczeństwa
    shallow foundation
    bearing capacity
    eccentric loading
    partial safety factors
    Opis:
    Hipoteza Meyerhofa dotyczy nośności mimośrodowo obciążonych fundamentów bezpośrednich. Stosując tzw. efektywną szerokość fundamentu, sprowadza się obliczenia nośności ław fundamentowych do przypadku obciążenia centralnego, bez mimośrodu. Kontrolne obliczenia sprężysto-plastyczne z wykorzystaniem programu PLAXIS(R) potwierdzają dopuszczalność i dobrą jakość tego uproszczenia. W drugiej części pracy poddano weryfikacji tzw. cząstkowe współczynniki bezpieczeństwa wprowadzane przez Eurokod EC7 oraz współczynniki generowane przez losowy mimośród obciążenia. Kalibracji dokonano za pomocą metody Hasofera-Linda, stwierdzając, że generalnie wartości współczynników w Eurokodzie EC7 są właściwie dobrane.
    The Meyerhof hypothesis deals with the bearing capacity of eccentrically loaded shallow foundations. It uses an effective foundation width thus addresses the bearing capacity calculation to the one for centrally loaded strip foundations of the reduced width. Testing elasto-plastic analyses based on the PLAXIS(R) code confirm good accuracy of such a simplification. In the second part, the paper focuses on partial safety factors proposed by the Eurocode EC7. A special attention is also paid to the role of random eccentricity. Making use of the Hasofer-Lind calibration, it is found that the values of partial safety factors proposed by EC7 are reasonable.
    Źródło:
    Górnictwo i Geoinżynieria; 2009, 33, 1; 75-83
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental evaluation of eccentric mechanism power loading of movable pressure plate in die-cutting press
    Autorzy:
    Knysh, Oleh
    Rehei, Ivan
    Kandiak, Nazar
    Ternytskyi, Serhij
    Ivaskiv, Bohdan
    Powiązania:
    https://bibliotekanauki.pl/articles/2204585.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    die cutting press
    cutting
    cardboard
    linear cutting effort
    cutting rule
    torque
    eccentric
    Opis:
    The paper reports experimental research on torques during cardboard cutting in the die-cutting press with eccentrics in the drive of the movable pressure plate. To conduct the research, an experimental bench with eccentrics in the drive of the die-cutting press is designed and manufactured. The manufactured experimental device for the research on cardboard blanks provides the possibility of getting dependencies of loadings at different parameters of the die-cutting process. The experimental approach envisages the use of the strain gauge measurement method and the wireless module for data collecting, as well as the software for its processing, for getting trustworthy results with minimum faults. The method gives an opportunity to study the torque values during the cardboard-cutting efforts on the drive shaft. The paper shows changes in the torque value on the drive shaft during the kinematic cycle with and without the use of cardboard blank. The angle of the drive shaft rotation during the cutting process was evaluated at selected values of the cardboard thickness. The relationship between the linear cutting efforts and the cardboard thickness, its fibre direction, cutting rule type and rotational speed of the drive shaft is elaborated. This kind of data is approximated by a logarithmic function (logarithmic curve), at R2 from 0.90 to 0.98. The thickness of the cardboard significantly influences the value of the linear cutting effort at all the studied parameters.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 266--273
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric analysis of the whole loading process of translation-torsion coupled vibration characteristics of the multi-layer bi-directional eccentric frame structure
    Autorzy:
    Kuang, Yuping
    Liu, Yanshan
    Powiązania:
    https://bibliotekanauki.pl/articles/2104768.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    eccentric structure
    translation-torsion coupled
    vibration characteristics
    eccentricity
    uncoupled torsion to lateral frequency ratio
    Opis:
    Earthquake investigations confirm that irregular structures suffer more damage than their symmetric counterparts. The vibration mode of irregular structures is affected by the cou- pling of lateral and torsional vibration characteristics. The analysis of the lateral-torsional coupling effect is mainly limited to unidirectional eccentric structure or single-layer eccentric design. To fill this gap, this paper presents a parametric study of the whole loading pro- cess, exploring lateral-torsional coupling vibration characteristics of multi-layer bi-directional eccentric structures. The performed nonlinear static analysis revealed that the natural fre- quency of eccentric frames with different layers exhibited a general pattern with a three-stage evolution from elastic to elastic-plastic stages. Accordingly, three different elastic-plastic de- velopment stages of parametric analysis were defined. The effects of the uncoupled torsion-to- -lateral frequency ratios Ω and stiffness eccentricities on the translation-torsion coupled vi- bration characteristics in the above three stages were simulated via self-compiled programs on the MATLAB platform. The results obtained show that the range of Ω controlling the vibration characteristics was related to the eccentricities. Therefore, it was proposed to set different limit values of Ω in designing and analyzing the structures with different bi- directional eccentric degrees. At Ω = 1.1 ∼ 1.2, the coupling effect between bi-directional eccentricities led to transformation between the first- and second-order vibration modes, while the direction with the lowest lateral stiffness could not be directly judged as the structure first-order principal vibration direction. In the third stage, when the bi-directional eccentricities reached or even exceeded 0.3, the second and third modes transformed into each other.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 479--494
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soveršensvovanie processa zagruzki transportnykh sredstv kormouorocnym kombajnom pri urobke trav na silos
    Improvement of the process of loading vehicles with a forage harvester when harvesting grasses for silage
    Autorzy:
    Milev, Aleksandr D.
    Otroshko, Sergej A
    Shevtsov, Aleksey V.
    Kosolapov, Vladimir M.
    Sharikov, Nikolay D.
    Tseyko, Vitaliy I.
    Romaniuk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/338115.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    feed
    forage harvester
    silo line
    active visor
    working stroke
    drive
    eccentric
    flexible connection
    element roboczy
    napęd
    pasza
    proces załadunku
    przyczepa paszowa
    sieczkarnia zbierająca
    Opis:
    When harvesting plant mass by forage harvesters for haylage, maize of high ripeness for silage, etc., one of the tasks is to increase the efficiency of the use of vehicles by increasing the quantity of transported growing mass, which is achievable with proper compaction and uniform distribution of the vehicle bunker. This is facilitated by the use of an active visor with a return movement located on the silo line of the forage harvester. The results of theoretical studies on optimization of operation modes and improving the design of active visor are presented. The options for a smooth and continuous control of the working stroke of the active visor located on the silo line of forage harvester are developed. When harvesting vegetable mass with forage harvesters for haylage, corn of wax ripeness for silage, etc.one of the tasks is to increase the efficiency of using vehicles by increasing the amount of transported plant mass, which is achievable if it is properly compacted and evenly distributed over the vehicle body. This is facilitated by the use of an active visor, i.e. a visor with a return movement on the silo of the forage harvester. Theoretical studies on optimizing operating modes and improving the design of the active visor on the silo of the forage harvester were carried out in accordance with the provisions of classical mechanics. Four basic schemes for controlling the working stroke of the visor are structurally justified. The use of the proposed control concepts and active visor designs allows you to control the process of uniform and homogeneous loading of vehicles when harvesting grasses for silage by forage harvesters.
    Podczas zbioru kukurydzy na kiszonkę w stadium dojrzałości woskowej za pomocą sieczkarni do sianokiszonki jednym z zadań jest zwiększenie wydajności użytkowania pojazdów przez zwiększenie ilości transportowanej masy roślinnej. Można to osiągnąć w warunkach odpowiedniego zagęszczenia i równomiernego rozłożenia masy na nadwoziu pojazdu. Ułatwia to użycie elementów roboczych sieczkarni. Teoretyczne badania dotyczące optymalizacji trybów pracy i poprawy konstrukcji elementów roboczych sieczkarni przeprowadzono zgodnie z zasadami mechaniki klasycznej. Cztery podstawowe schematy kontroli udaru elementu roboczego są strukturalnie uzasadnione. Zastosowanie proponowanych obwodów sterowania i konstrukcji elementu roboczego pozwala kontrolować proces równomiernego ładowania pojazdów podczas zbioru masy roślinnej.
    Źródło:
    Woda-Środowisko-Obszary Wiejskie; 2019, 19, 3; 15-24
    1642-8145
    Pojawia się w:
    Woda-Środowisko-Obszary Wiejskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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