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    Wyświetlanie 1-9 z 9
    Tytuł:
    Pullout tests of geogrids embedded in non-cohesive soil
    Autorzy:
    Duszyńska, A.
    Bolt, A. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/241500.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    pullout
    geogrid
    laboratory research
    testing
    Opis:
    A source of essential information regarding the behaviour of the soil-reinforcement system can be laboratory pullout tests. In this paper, basic aspects of such testing concerning the equipment used (designed and constructed in the Geotechnical Laboratory of Gdańsk University of Technology) and procedures applied are described. The pullout tests carried out for biaxial polypropylene geogrids embedded in coarse sand are presented. Finally basing on the test results the interpretation procedure for the estimation of elasto-plastic interaction between geogrid and soil is proposed. The method proposed enables determining soil-geogrid interface: stiffness modulus responsible for elastic behaviour of the system in the range of permissible loads, as well as maximum pullout resistance corresponding to limit state.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 135-147
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pullout capacity of cylindrical block embedded in sand
    Autorzy:
    Sternik, K.
    Dołżyk-Szypcio, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/178630.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    block anchors
    pullout capacity
    FE analysis
    plastic limit analysis
    Opis:
    Calculation of pullout capacity of anchoring concrete cylindrical block by finite element method is carried out. 3D model of the block assumes its free rotation. Alternative solutions with one and two pulling forces attached at different heights of the block are considered. Dependency of the ultimate pulling force on the points of its application, the block’s embedment depth as well as contact friction are investigated. Results of FE analysis and simple engineering estimations are compared. The maximum pullout resistance results from FE analysis when the rotation of the block is prevented.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 1; 30-37
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Skirted Foundation in Sand Subjected to Rapid Uplift
    Autorzy:
    Kulczykowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1837763.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    skirted foundation
    suction caisson
    pullout resistance
    rapid uplift
    model investigations
    Opis:
    This paper reports results from 1g model tests carried out under single gravity on a skirted foundation installed in sand and subjected to a rapid uplifting force. The effects of displacement rates ranging from 5 mm/s to 450 mm/s on the ultimate capacity, suction pressure inside the skirt compartment, and time of extraction were investigated. Test results indicate that the displacement rate significantly affected the magnitude of uplift resistance, as well as the magnitude of suction under the foundation lid, but had little effect on the relationship between stress and the displacement of the foundation. The shapes of the uplift capacity-displacement curve and the suction-displacement curve were similar for all experimental displacement rates.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2020, 67, 1-4; 17-34
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of pullout strength in different designs of pedicle screws for osteoporotic bone quality using finite element analysis
    Autorzy:
    Yang, Shih-Chieh
    Liu, Pao-Hsin
    Tu, Yuan-Kun
    Powiązania:
    https://bibliotekanauki.pl/articles/306201.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osteoporoza
    cement
    FEM
    osteoporosis
    cement augmentation
    pedicle screw
    pullout strength
    finite element analysis
    Opis:
    The purpose of this study was to investigate pullout strength of three types of pedicle screws with and without cement augmentation in osteoporotic bone using finite element analysis. Methods: Twelve 3D finite element models were created to investigate the effect of pullout strength when comparing between pedicle screw types and bone cement clouds. The bottom side of bone block model was constrained and U-shape head was applied 1 mm in direction of longitudinal axis of pedicle screw to perform pullout resistance. The material properties of the FEA was set as linear elastic, homogenous, isotropic condition. The element sensitivity of convergence testing has been performed and variation of the sequential analytical results was less than 3%. Results: The results showed that the maximum total reaction force (133.8 N) was detected in the model of cannulated pedicle screw combined with a central pin with 4 ml cement augmentation, but, in contrast, the minimum total reaction force (106.8 N) was discovered in the model of cannulated pedicle screw without cement. A strong relationship (r = 0.9626) is found in comparison with the biomechanical results between pullout strength of sawbone testing and reaction forces of the FEA. Conclusions: The study concludes that the cannulated pedicle screw can not only provide an inner guider for cement flow and increase bending resistance (deflection effect) when a central pin is selected, but also can improve the pullout strength in the osteoporotic bone to add cement augmentation. The design of the cannulated pedicle screw is suggested for poor bone quality to change pullout failure.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 57-66
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pullout behavior of steel reinforcements used for mechanically stabilized earth structures
    Autorzy:
    Meddah, Abdelaziz
    Sahli, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2016522.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    soil reinforcement
    pullout behavior
    static loading
    repeated loading
    MSE structure
    mechanically stabilized earth
    Opis:
    The pullout behavior of mechanically stabilized earth (MSE) structures is very complicated and depends on many parameters which related to the backfill soil properties, the reinforcement characteristics and the interaction between them. This paper investigates the pullout behavior of many soil reinforcements under static and repeated loading. Four types of steel reinforcements were studied: Strip, W-shaped, ribbed and punched. The results obtained show that the change of the shape of reinforcement may improve the pullout resistance of MSE structures. Therefore, the best performance was obtained by the ribbed and the punched reinforcements, under static loading as well as repeated loading.
    Źródło:
    Mining Science; 2021, 28; 47-58
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pullout evaluation of sawbone experiment in different types of pedicle screws combined with bone cement augmentation for severe osteoporotic spine
    Autorzy:
    Yang, S.-C.
    Liu, P.-H.
    Tu, Y.-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307271.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osteoporoza
    kości
    wytrzymałość
    osteoporosis
    bone cement augmentation
    cannulated pedicle screw
    sawbone
    pullout strength
    Opis:
    Purpose: The conventional screw is unable to provide enough screw-bone interface strength for osteoporotic cencellous bone, and complications resulting from loosening or failure of the implants remain a significant clinical problem. Hence, the purpose of this study is to investigate pullout strength and energy in three types of the pedicle screws, including conventional solid pedicle screw, cannulated pedicle screw, and cannulated pedicle screw with a central pin, using osteoporotic sawbone test block with different bone cement volumes through pullout force testing. Methods: The control group (n = 15) of the osteoporotic sawbone test block includes groups A, B, and C to reflect three types of the pedicle screws without bone cement augmentation. The cemented group (n = 45) of the osteoporotic sawbone test block includes groups D1, D2, D3, E1, E2, E3, F1, F2, and F3 to reflect three types of the pedicle screws with PMMA bone cement of 2, 3, and 4 mL augmentation. Results: The results showed that the pullout strength and energy in the cemented group were significantly larger than that in the control group. Moreover, the best performances of the pullout strength and energy in the cemented group were evidenced obviously in the case of cannulated pedicle screw with a central pin with 4 mL bone cement augmentation. Conclusions: This study concludes that cement argumentation in the cannulated pedicle screw with a central pin can increase a pullout strength of pedicle screw for severe osteoporotic patients while bone cement of injective volume is limited.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 55-64
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Atmospheric Pressure Oxygen Plasma treatment on Bonding Characteristics of Basalt Fibre Reinforced Concrete
    Wpływ obróbki plazmą pod ciśnieniem atmosferycznym na właściwości wiązania betonu zbrojonego włóknem bazaltowym
    Autorzy:
    Nandagopal, K. R.
    Selvakumar, A.
    Raja, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1857666.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    basalt fibre
    plasma treatment
    pullout strength
    debonding energy
    włókno bazaltowe
    obróbka plazmowa
    siła wyrywająca
    energia odklejania
    Opis:
    In this research work, the bonding characteristics of plasma treated basalt fibres were analysed by employing the fibre pull-out test. 80 samples were prepared with two different spans of basalt fibres (such as 25 mm and 50 mm) and four levels of embedded length (10, 15, 20 and 25) inside standard M20 grade concrete. Debonding and bonding characteristics of the plasma treated fibres were compared with raw basalt fibres through the fibre pull-out test. The plasma treated and raw basalt fibres were characterised through Field emission scanning electron microscope (FESEM) and Fourier transform infrared (FTIR) analysis. It was observed that confirmation of the presence of hydroxyl groups on the basalt fibre surface was realised through the FTIR test and that there was higher adsorption of concrete particles by the plasma treated basalt fibres through FESEM. The de bonding and fibre pull-out energy of the plasma treated basalt fibres were improved by about 9% and 10% compared with 25 mm and 50 mm raw basalt fibres. From the observation above, it can be stated that the Surface modification of basalt fibre may lead to a change in the debonding and pull-out energy level.
    W pracy zostały przeanalizowane właściwości wiązania włókien bazaltowych poddanych obróbce plazmowej. Przygotowano 80 próbek dwóch różnych rodzajów włókien bazaltowych: 25 mm i 50 mm z czterema poziomami zatopionej długości (10, 15, 20 i 25) wewnątrz standardowego betonu klasy M20. Charakterystyki odklejania i wiązania włókien poddanych obróbce plazmowej porównano z surowymi włóknami bazaltowymi w teście wyciągania włókien. Obrobione plazmowo i surowe włókna bazaltowe scharakteryzowano za pomocą skaningowego mikroskopu elektronowego z emisją polową (FESEM) i analizy w podczerwieni z transformacją Fouriera (FTIR). Potwierdzenie obecności grup hydroksylowych na powierzchni włókna bazaltowego uzyskano za pomocą testu FTIR. Na podstawie wyników analizy FESEM stwierdzono, że nastąpiła większa adsorpcja cząstek betonu przez poddane obróbce plazmowej włókna bazaltowe. Rozwarstwianie i energia wyciągania włókien bazaltowych poddanych obróbce plazmowej uległy poprawie o około 9% i 10% w porównaniu z surowymi włóknami bazaltowymi 25 mm i 50 mm. Na podstawie przeprowadzonej obserwacji stwierdzono, że modyfikacja powierzchni włókna bazaltowego może prowadzić do zmiany poziomu energii odklejania i wyciągania.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 4 (148); 90-93
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tests of selected elements of building components in the light of compulsory requirements
    Autorzy:
    Szweda, Stanisław
    Wojtaszczyk, Marek
    Krenicky, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/27324326.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    steel reinforcement bars
    strength tests
    composite reinforcement bars
    pullout test of bars
    bar adhesion test to concrete
    Opis:
    A procedure of standard strength tests of reinforcement bars conducted at present at the ITG KOMAG is discussed. Taking advantage of the bibliographic review, concerning tests of reinforced concrete with steel reinforcement bars, a possibility of using the KOMAG testing infrastructure to broaden the scope of tests of reinforcement bars was analyzed. Due to a more and more common use of composite bars for reinforcing and strengthening concrete structures, the methods of testing their strength properties are discussed. The conditions enabling to conduct strength tests of composite reinforced concrete bars at the ITG KOMAG are determined.
    Źródło:
    Mining Machines; 2022, 40, 3; 130--140
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The experimental instrumented bolt with fibre bragg grating force sensors
    Autorzy:
    Wang, Tuo
    Chang, Jucai
    Gong, Peng
    Shi, Wenbao
    Li, Ning
    Cheng, Shixing
    Powiązania:
    https://bibliotekanauki.pl/articles/219784.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    siatka światłowodowa
    system kotwienia
    wspornik śruby
    fiber Bragg grating
    pullout testing
    anchorage systems
    pre-tightening torque
    bolt support
    Opis:
    Monitoring the stress change of bolt and knowing the anchoring condition in a reasonable and effective way, accurately, can effectively prevent tunnel accident from breaking out. The stress of rock mass around the roadway is usually transferred to the anchor rod in the form of axial load, so it is of great significance to study the axial load of the bolt. In this paper, a full size anchoring and drawing experiment system was designed and established, innovatively, which realized the pull-out test of 2.5 m prestressed end Anchorage and the full-length Anchorage by using the new resin anchorage agent under vertical and horizontal loads. Through the application of fiber Bragg grating (FBG) sensing technology to the test of full-scale anchor rod, the axial force distribution characteristics of the end Anchorage and the full-length Anchorage anchor rod were obtained under the action of pre-tightening torque and confining rock pressure. The comparison indicates that the proportion of high stress range accounts for only 17.5% and the main bearing range is near the thread end of anchor rod, the proportion of main bearing range of end Anchorage is 83.3%, and the feasibility of FBG force-measuring anchor rod is verified in the field. The research results have certain reference value.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 1; 179-194
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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