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    Wyświetlanie 1-12 z 12
    Tytuł:
    Experimental investigation of local scour under two oblong piers of a bridge crossing a sharp bend river
    Autorzy:
    Abdulwahd, Abdulrazaq K.
    Maatooq, Jaafar S.
    Powiązania:
    https://bibliotekanauki.pl/articles/28411623.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    flow intensity
    local scour
    oblong pier
    sharp bend
    Opis:
    Bridges built across a river bend and supported by more than one pier has been experimentally studied regarding the shape and nature of erosion and deposition. For this purpose, a U-shaped laboratory channel was used with two oblong piers installed at different locations. The first one was at the mid-section of the upstream straight reach, whereas in the second site within the bend, the piers have been installed at sections of central angles 0°, 30°, 60°, 90°, 120°, 150°, 170°, and 180°, from the beginning to the end of the bend segment respectively. The studies were conducted under clear water and threshold flow conditions. The results show that the higher and lower values of local scour around the pier positioned close to the outer bank, are 1.803 and 0.623 times the pier width when the bridge was installed at an angle of 90° and 30° respectively. As for the pier close to the inner bank, the deepest local scour was 1.786 times of the pier width when the bridge was installed at 60° of the bend, while the least one was 0.516 times of the pier width when the bridge was located in the 180° sector. It is worth noting that the presence of piers within sector 150 is less affected by local scour than in the other sections.
    Źródło:
    Journal of Water and Land Development; 2023, 58; 129--135
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of T-Splitter on the Laminar Flow Field around Cylinder Pier
    Autorzy:
    Qasim, Rafi Mohammed
    Faisal, Safaa Hameed
    Jabbar, Tahseen Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/2204700.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bridge pier
    hydraulic field
    laminar flow
    T-splitter
    Opis:
    The hydrodynamic pattern, which surrounds the pier near a splitter that has T-shape, is investigated by adopting a numerical method and using ANSYS Fluent Software to achieve computation. The essential objective of this paper refers to revealing the behavior of the hydrodynamic field around the pier due to the existence of the upstream splitter plate. The T-splitter plate has not been used in previous works for controlling the flow field around the cylinder body. The main assumptions adopted in solving the hydrodynamic problem are incompressible, steady, and laminar flow. Reynolds number values are taken from 40 to 200 to guarantee laminar flow with laminar vortex street. The numerical investigation focuses on two main variables. These variables are the horizontal distance between the rear portion of a splitter and the pier center and bubble length. The numerical study comprises pressure contours, water velocity contours, and streamlines. Results reveal that bubbles are generated and developed due to the existence of the splitter. Four bubbles are generated, two of them are formed in the region between the splitter rear portion and pier leading portion and the other two bubbles are formed at the cylindrical pier wake region. The size and length of these four bubbles are dominated by the Reynolds number, these bubbles are non-symmetrical. It is revealed from the solution that with the rise in Reynolds number values then the disturbance will be increased simultaneously. The horizontal distance dominates the hydraulic response, which is described by the streamlines, pressure contours, and water flow contours. Furthermore, the Reynolds number has a significant influence on the pressure contours, water flow contours, and streamlines. Finally, a correlation equation is derived relying on bubble length, horizontal distance, and Reynolds number.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 202--215
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Neural Network for Estimation of Local Scour Depth Around Bridge Piers
    Autorzy:
    Shakir Ali Ali, Ahmed
    Günal, Mustafa
    Powiązania:
    https://bibliotekanauki.pl/articles/2097766.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    artificial neural network
    bridge pier
    hydraulics
    local scour
    Opis:
    Local scour around bridge piers impairs the stability of bridges’ structures. Therefore, a delicate estimation of the local scour depth is vital in designing the bridge piers foundations. In this research, MATLAB software was used to train artificial neural network (ANN) models with four hundred laboratory datasets from different laboratory studies, including five parameters: pier diameter, flow depth flow velocity, critical sediment velocity, sediment particle size, and equilibrium local scour depth. The outcomes present that the ANN model with the Levenberg-Marquardt algorithm and 11 nodes in the single hidden layer gives an accurate estimation better than other ANN models trained with different training algorithms based on the regression results and mean squared error values. Besides, the ANN model accurately provides predicted local scour depth and is better than linear and nonlinear regression models. Furthermore, sensitivity analysis shows that removing pier diameter from training parameters diminishes the reliability of prediction.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2021, 68, 2; 87--101
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of laminar flow passing through a T-splitter plate and bridge pier.
    Autorzy:
    Qasim, Rafi Mohammed
    Jabbar, Tahseen Ali
    Faisal, Safaa Hameed
    Powiązania:
    https://bibliotekanauki.pl/articles/36063658.pdf
    Data publikacji:
    2023
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    hydrodynamic
    laminar flow
    open channel
    pier
    splitter plate
    Opis:
    The present analysis focuses on the investigation of the two-dimensional flow passing a bridge pier nearby a splitter plate in different regimes of a laminar flow. The splitter plate is T-shaped and two different cases have been studied based on the form of the splitter plate relative to the bridge pier. The analysis is implemented for steady and incompressible water flow in an open channel. The current study deals with velocity vectors, drag coefficients, lift coefficients, and skin friction. The analysis of the velocity vector gave a good indicator about the separation process and dissipation, which occurs at the splitter plate before the occurrence of these processes at the front face of the pier, especially the flow separation process. Moreover, the velocity vector gave a good image about the flow direction at two regions, the first region is located between the rear portion of the splitter plate and the frontal face of the pier, while the second region is the wake region, which is located at the downstream of the pier. Negative drag coefficient, lift coefficient, and skin friction coefficient values are obtained from the analysis. This happens due to the existence of the splitter plate that leads to the reduction of these values.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2023, 32, 2; 135-154
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Collapse modes of concrete reinforced square bridge piers under vehicle collision
    Autorzy:
    Zhou, Xiuneng
    Xie, Zhongyou
    Zhao, Zhixian
    Li, Cheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2086980.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    RC square pier
    collapse mode
    vehicle collision
    numerical simulation
    Opis:
    In the field of engineering protection, there is a structural disaster named heavy vehicles impacting column structures. When a heavy truck collides with a reinforced concrete (RC) column at a high velocity, a large impact force generated makes perhaps the column fail and even collapse. Therefore, it is necessary to study the dynamic characteristics during such a disaster, which can provide some reference for structural design, optimization and protection. The RC column impacted by a vehicle could be simplified as a beam fixed at the bottom loaded by a concentrated force, whose deformation is controlled by shearing and bending. In the present work, the ultimate static forces corresponding to shearing and bending collapse are proposed based on theoretical analyses. The model validation is performed using the finite element approach and the theoretical analytical results are in good agreement with the finite element simulation results, which validates the present analytical model. Three cases are simulated by utilizing finite element code ABAQUS, which reveals that the approximate plateau collapse force keeps a long stage beyond the peak failure one. In addition, three collapse modes are observed based on the static force and deformation analysis, validating the present framework which can be used for routine pier design. The work can be extended to estimate collapse modes of building columns under a vehicle collision.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 375--384
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The study of the local scour behaviour due to interference between abutment and two shapes of a bridge pier
    Autorzy:
    Muhsen, Noor A.A.
    Khassaf, Saleh I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174307.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    local scour
    pier shape
    scour interference
    spacing effect
    vertical wall abutment
    Opis:
    Although the complexities and irrevocable consequences associated with bridge scour have attracted researchers interest, their studies scarcely indicated the effect of a bridge pier proximity to an abutment. This research aims to measure maximum scour depth and exhibit the impact of pier-abutment scour interference based on laboratory experiments where vertical-wall abutment and two shapes of a pier (oblong and lenticular) were used at three different spacings (23.5, 16.0, 9.0 cm). The results showed an obvious increase in the scour depth ratio when increasing flow intensity, Froude number, and a decreasing flow depth. They also showed that reduced pier-abutment spacing was accompanied by increase in pier scour for both shapes while decrease in abutment scour. The maximum scour depth that caused by an oblong shape was more than a lenticular shape by about 10.8%. Furthermore, new empirical equations were derived using IBM SPSS Statistics 21 with determination coefficients of 0.969, 0.974, and 0.978 for oblong, lenticular and abutment, respectively. They showed the correlation between predicted and observed data.
    Źródło:
    Journal of Water and Land Development; 2022, 55; 240--250
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Engineering forecasting of the local scour around the circular bridge pier on the basis of experiments
    Inżynierskie prognozowanie rozmyć miejscowych wokół walcowego filara mostowego na podstawie doświadczeń
    Autorzy:
    Bajkowski, Sławomir
    Kiraga, Marta
    Urbański, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1852299.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    filar
    most
    rozmycie
    prognoza
    badania modelowe
    bridge
    pier
    scour
    forecast
    model calculations
    Opis:
    The aim of the study was to indicate the procedure of using laboratory physical model tests of scour around bridge piers for the purposes of determining the potential scour of a riverbed on field bridge crossings. The determination of the uniform modeling scale coefficient according to the criterion of reliable sediment diameter limits the application of the results of tests on physical models to selected types of sediment. The projected depths of scouring of the riverbed at the pier in nature were determined for an object reproduced in the scale of 1:15 determined from the relationship of flow resistance, expressed by hydraulic losses described by the Chézy velocity coefficient, the value of which, in the model and in nature, should be the same. Expressing the value of the Chézy velocity coefficient with the Manning roughness coefficient and introducing the Strickler parameter, it was shown that the coarse sand used in the laboratory bed models the flow resistance corresponding to the resistance generated by gravel in nature. The verification of the calculated size of scouring was based on popular formulas from Russian literature by Begam and Volčenkov [16], Laursen and Toch’s [20] from the English, and use in Poland according to the Regulation ... (Journal of Laws of 2000, No. 63, item 735) [32].
    Celem pracy było wskazanie procedury wykorzystania laboratoryjnych fizycznych badań modelowych rozmyć wokół filarów mostowych dla potrzeb określenia potencjalnego rozmycia koryta rzecznego na terenowych przeprawach mostowych. Wykorzystanie wyników badań laboratoryjnych w prognozowaniu rozmyć wokół filarów nowo projektowanych mostów wymaga uwzględnienia wpływu skali modelu. W warunkach analizowanego zadania skalę modelu ustalono z relacji parametrów granulometrycznych rumowiska wykorzystanego w badaniach modelowych i rumowiska rzecznego w cieku, dla którego prowadzono prognozę rozmyć. Określenie współczynnika nieskażonej skali modelowania według kryterium miarodajnej średnicy rumowiska ogranicza zastosowanie wyników badań na modelach fizycznych do wybranych rodzajów rumowiska rzecznego. Prognozowane głębokości rozmycia dna przy filarze w naturze zostały określone dla obiektu modelowanego w skali 1:15 ustalonej z relacji oporów przepływu, wyrażonych stratami hydraulicznymi opisanymi współczynnikiem prędkości Chezy, którego wartość na modelu i w naturze powinna być taka sama. Wyrażając wartość współczynnika prędkości Chezy, współczynnikiem szorstkości Manninga i wprowadzając parametr Stricklera, wykazano, że piasek gruby zastosowany w korycie laboratoryjnym modeluje opory przepływu odpowiadające oporom jakie generuje żwir w naturze. Do weryfikacji obliczonych wielkości rozmyć wykorzystano popularne wśród projektantów formuły z literatury rosyjskiej Begama i Volčenkova [35], angielskiej Laursena i Tocha [36] oraz zalecane do stosowania w Polsce według Rozporządzenia… [5]. W rezultacie otrzymano wzory opisujące wielkości rozmyć dla badanego obiektu ze wskazaniem zakresów ich stosowania.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 469-488
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of scour depth around bridge piers in tandem arrangement using M5 and ANN regression models
    Autorzy:
    Rahul, M.
    Baldev, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818520.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tandem arrangement
    scour depth
    sediment
    pier
    ANN
    M5 model
    układ tandemowy
    głębokość wymycia
    osad
    pomost
    model M5
    Opis:
    Purpose: Due to an increase in a number of bridges being constructed, scour depth around bridge piers is gradually being recognized as one of the possible reasons for bridge failure. According to [1] about 53% of bridge failures in the US were caused due to floods and corresponding scour in the rivers. Lots of work has been carried out around the single pier but in the case of group piers, the work is very less. Hence, it becomes necessary to calculate the actual scour depth around the bridge piers considering the close location of bridges as well. Design/methodology/approach: Recognizing the need for research in this direction, an experimental study was planned and conducted in the Hydraulics Laboratory of Civil Engineering Department of National Institute of Technology Kurukshetra, India. Experiments were conducted in a standard recirculating tilting bed water flume 15 m long, 0.4 m wide, and 0.60 m deep. The orientation of more than one pier, namely Tandem pattern was employed for the work. Two pier models, 62 mm and 42 mm diameter were used for the experimental study. The mobile bed used in the experiments had an average mean size, d50 = 0.23 mm, 0.30 mm and 0.50 mm. Findings: The outcomes of the ANN function and M5 model analysis have been used to compare with experimental results. From the earlier studies, it was concluded that, when the clear spacing between the pier models was greater than 0D the scour depth around the piers increase with a rapid rate. However, in the case of modelling techniques, M5 models show higher predictive accuracy than ANN models. Research limitations/implications: It is a significant area of research. However, the present study has been a time and facility- constrained study. Therefore, there is a large scope to conduct further studies on the subject, Different pattern i.e. Side by Side; Staggered and Group of piers can be adopted for further investigations. Originality/value: Sufficient work has been done by number of researchers around the single bridge pier. But due to rapid urbanization a number of bridges constructed in close proximity to each other which affects the scour depth of each other. Modelling techniques used in hydraulic engineering are not always effective in practice. The present study discusses the effect of spacing on scouring around piers in a tandem arrangement using experimental as well as modelling techniques. To predict the scour depth of the Tandem arrangement 89 laboratory data sets have been used.
    Źródło:
    Archives of Materials Science and Engineering; 2020, 102, 2; 49--58
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on the process of ship striking the anti-collision pier
    Autorzy:
    Zhao, C.
    Yan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2211921.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    navigational infractructure
    anti-collision
    anti-collision pier
    inland waters
    analysis of ship collision
    collision avoidance
    collision force
    China's shipping industry
    Opis:
    China's extensive inland navigable water system determines that inland navigation must be an important part of China's shipping industry. The collision process of ship striking the anti-collision pier is analyzed through simulation experiment in this paper. The results show that the collision process usually lasts less than 2 seconds, and the peak value of the collision force, friction and resultant force appears 0.5 after the start of the collision.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 3; 501--504
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    “denk an Pasolinis »verzweifelte Leere von Casarsa«” Considerations on the Influence of Spanish Mysticism and of Pasolini’s »Friulian« Poems on Peter Handke’s Noch einmal für Thukydides and Versuch über die Jukebox
    Autorzy:
    Pulimanti, Alessandro
    Powiązania:
    https://bibliotekanauki.pl/articles/2231692.pdf
    Data publikacji:
    2022-10-06
    Wydawca:
    Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
    Tematy:
    Peter Handke
    essay on the Jukebox
    Once Again for Thucydides
    Pier Paolo Pasolini
    poems in Casarsa
    comparative method
    ethno-anthropological perspective
    Opis:
    The aim of this paper is to reflect on Handke’s reception of Spanish and Friulian traditions. The first part of this paper will mention Miguel de Cervantes’, Teresa of Ávila’s and John of the Cross’ influence on Handke’s works, while also focusing on Handke’s fascination with the Spanish tradition and Pasolini’s works through the use of the comparative method. Pasolini’s vision of modern cultural customs is also taken into consideration in Handke’s Essay on the Jukebox, where clear references to Spanish authors also appear. The same occurs in Handke’s Glowworm Epopee, where Pasolini’s critical view of the “vanishing of the fireflies” indirectly shines throughout a tribute to the Poems in Casarsa. In the second section, an anthropological perspective will be employed, seeing as Handke’s ‘mysticism’ can be said to have drawn inspiration from the Romantic motif of “Mother Holle” (Höller 2013). In this regard, Ginzburg’s (1989) and Nardon’s (1999) studies will be used to assume Handke’s attachment to Friulian folk topics dating back to the 17th century. As opposed to Handke’s reception of Pasolini’s critical views and of Spanish mysticism, the influence of Friulian ethno-anthropological aspects on the Carinthian author’s works still needs to be demonstrated and its study improved.
    Źródło:
    Academic Journal of Modern Philology; 2022, 15; 267-277
    2299-7164
    2353-3218
    Pojawia się w:
    Academic Journal of Modern Philology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the resistance of concrete hollow thin-walled high piers to rock collisions
    Autorzy:
    Huang, Yao
    Powiązania:
    https://bibliotekanauki.pl/articles/27312168.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    podpora betonowa
    filar mostowy
    element cienkościenny
    zderzenie
    skała
    siła uderzenia
    uszkodzenie
    odporność na kolizje
    concrete pier
    thin-walled element
    rock
    collision
    collision force
    damage
    collision resistance
    Opis:
    Concrete hollow thin-walled high piers (CHTWHPs) located in mountainous areas may be destroyed by the huge impact force of accidental rocks. The study focuses on analyzing the effects of rock impact on the pier, including its impact force, pier damage, dynamic response, and energy dissipation characteristics. The results show that: (1) Increasing the impact height led to a decrease in the peak impact force. Specifically, 15.5% decrease in the peak collision force is induced when the height of rock collision rises from 10 m to 40 m. (2) The damage mode of the pier’s collision surface is mainly oval damage with symmetrical center, radial damage on the side surface, and corner shear failure on the cross section. (3) The peak displacement of bridge pier increases with the increase of collision height. As the collision height increased from 10 m to 40 m, the bridge pier’s peak displacement also increased, rising by 104.2%. (4) The concrete internal energy gradually decreased with increasing collision height, dropping by 36.9% when the height of rock collision rises from 10 m to 40 m. The reinforcement internal energy showed an increase of 78%. The results of this study may provide reference for the rock collision resistance design of CHTWHPs.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 187--197
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anti-overturning safety performance investigation for single column pier bridge
    Autorzy:
    Ji, Yongcheng
    Liu, Wenchao
    Li, Wei
    Wang, Pixiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2174020.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    podpora jednokolumnowa
    most dźwigarowy
    stateczność przeciwwywrotna
    modelowanie metodą elementów skończonych
    przewrócenie
    obciążenie krytyczne
    obrót
    single column pier
    girder bridge
    anti overturning stability
    finite element modelling
    overturn
    ultimate load
    rotation
    Opis:
    Under eccentric load, a single column pier bridge often overturns. In order to study the anti overturning performance of a single column pier bridge, taking the accident bridge in Wuxi as an example, a finite element model is established based on ABAQUS. According to the model simulation results, the relationship between the ultimate rotational load and overturning load of the accident bridge is obtained, and the ratio of the latter to the former is 1.75. Based on the model, the stress state, displacement state, and support state of the accident bridge under dead load, highway class I vehicle load, and accident vehicle load are obtained. Whether the strength and stability of the accident bridge under each load meet the service requirements is analyzed. In order to explore the differences among China, United States, and Japan specifications, the lateral stability of accident bridges is checked. It is found that the safety of the United States and Japan specifications is conservative, but the utilization rate of bridge traffic capacity is low. The safety of China specifications is slightly lower, but it can maximize the bridge’s traffic capacity and judge the ultimate overturning state of the bridge more accurately. The research results can provide technical references for the design and application of a single-column pier bridge.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 221--240
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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