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Wyszukujesz frazę "Li, Yanfeng" wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Determination of force in single cable plane prestressed concrete polygonal line tower cable-stayed bridge based on minimum bending energy
    Autorzy:
    Li, Yanfeng
    Guo, Tianyu
    Bao, Longsheng
    Wang, Fuchun
    Powiązania:
    https://bibliotekanauki.pl/articles/1852393.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The cable force of a cable-stayed bridge plays a vital role in its internal force state. Different cable forces on both sides of the main tower make the force characteristics of the polygonal-line tower quite different from those of the straight-line tower. Therefore, the determination of the cable force of the polygonal-line tower cable-stayed bridge is a crucial aspect of any evaluation of its mechanical characteristics. A single-cable plane prestressed concrete broken-line tower cable-stayed bridge is taken as a case study to conduct a model test and theoretical cable force determination. The reasonable cable force of the bridge is determined by the minimum bending energy method combined with false load and internal force balance methods. analysis includes a comparison between cable force calculation results, model test results, and the design value of the actual bridge. The distribution law of the dead load cable force of the completed bridge is determined accordingly.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 565-579
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and theoretical research on large-diameter rock-socketed pile embedded depth
    Autorzy:
    Li, Yanfeng
    Zhao, Jihe
    Xiong, Ying
    Wang, Qinghe
    Powiązania:
    https://bibliotekanauki.pl/articles/1852536.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    badanie obciążeniowe
    obciążenie poziome
    model elementów skończonych
    przenoszenie obciążenia
    nośność graniczna
    głębokość
    gniazdo skalne
    pal fundamentowy
    pal wielkośrednicowy
    horizontal load
    loading test
    finite element model
    load transfer
    ultimate bearing capacity
    rock socket
    depth
    foundation pile
    large diameter pile
    Opis:
    A theoretical formula for large-diameter rock-socket depth is developed to support pail embedding in a large bridge pile foundation project. There is a horizontal additional stress concentration at the place where the soil around the rock-socketed pile meets the soil layer under the horizontal load. When the rock-socketed tip stress and bending moment of the pile are relatively small, the pile shows favourable embedment effect and the pile foundation can be considered safe. The function curve of soil resistance around the pile under the action of horizontal force was obtained by finite element analysis. The force characteristics reveal the depth of the largediameter rock-socketed pile under the horizontal load. As the rock-socketed pile rotates under the action of horizontal force, the rock mass resistance around the pile changes according to the cosine. The distribution of pileside soil resistance is proportional to the displacement and distributed according to the sine. A comprehensive correction coefficient of pile shaft resistance β is introduced to deduce the theoretical formula of the depth hr of the large-diameter rock-socketed pile embedded in the bedrock. It is verified through both experiments and numerical analysis.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 537-550
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate
    Autorzy:
    Liu, Liwei
    Li, Guofeng
    Zhao, Libing
    Li, Jinpeng
    Li, Yanfeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2146847.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vanadium-titanium magnetite concentrate
    selective reduction
    magnetic separation
    Fe separation
    V separation
    Opis:
    With the aim of separating Fe and V, a vanadium-titanium magnetite concentrate was selectively reduced, followed by magnetic separation. The processes accompanying reduction of the vanadium-titanium magnetite concentrate were investigated using thermodynamic simulation, experiments, scanning electron microscopy, and electron probe microanalysis. Appropriate reduction conditions and controlling the amount of CaCO3 promoted the reduction of Fe-containing minerals to metallic Fe. V was released from magnetite, ilmenite, and titanomagnetite, and was inhibited to reduce to metallic V, leading to V enrichment in the non-magnetic products in the form of oxides. Moreover, the Fe particles wrapped the slag phase when the amount of CaCO3 exceeded 8%, which is unfavourable for the magnetic separation of Fe and V. Magnetic products with an Fe content of 87.19%, Fe recovery of 82.62%, V content of 0.09% and non-magnetic products with a V content of 1.00% and a V recovery of 85.49% were obtained when the vanadium-titanium magnetite concentrate was reduced for 100 min at 1623 K with a C/O molar ratio of 2.5 and 8% CaCO3, followed by separating at a magnetic field strength of 85 mT.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 50--62
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and theoretical research on spatial shear lag effect of self-anchored suspension bridge steel box girder
    Autorzy:
    Li, Yanfeng
    He, Ying
    Bao, Longsheng
    Sun, Baoyun
    Wang, Qinghe
    Powiązania:
    https://bibliotekanauki.pl/articles/1852505.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    most samozakotwiony
    most wiszący
    dźwigar skrzynkowy
    dźwigar stalowy
    efekt opóźnienia ścinania
    analiza elementów skończonych
    self-anchored bridge
    suspension bridge
    steel box girder
    shear lag effect
    finite element analysis
    Opis:
    The shear lag effect of the steel box girder section in a self-anchored suspension bridge was investigated in this study. Finite element analysis software Midas Civil was used to discretize the girder under analysis into space plate elements and establish a plate element model. The law of shear lag in the longitudinal direction of the girder in the construction and completion stages was determined accordingly. The shear lag coefficient appears to change suddenly near the side support, middle support, side cable anchorage area, and near the bridge tower support of the steel box girder under the imposed load. The most severe shear lag effect is located near the side support and near the side cable anchorage area. Steel box girder sections are simulated before and after system conversion to analyze the shear lag coefficient in the bridge construction stage. The results show that the shear lag coefficient markedly differs before versus after system conversion due to the different stress mechanisms. The finite element analysis results were validated by comparison with the results of an analysis via analogous rod method.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 631-651
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on reinforcement technology of existing double-way curved arch bridge
    Autorzy:
    Zhang, Kexin
    Qi, Tianyu
    Xue, Xingwei
    Li, Yanfeng
    Zhu, Zhimin
    Powiązania:
    https://bibliotekanauki.pl/articles/1852535.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wzmocnienie
    most dwukierunkowy
    most łukowy
    most zakrzywiony
    zwiększenie przekroju
    efekt wzmocnienia
    croscross-section increasing
    reinforcement
    two-way bridge
    curved bridge
    arch bridge
    reinforcement effect
    Opis:
    Two-way curved arch bridges inherit the fine tradition of masonry structures, making full use of the advantages of prefabricated assembly, it adapts to the situation of no support construction and no large lifting machine and tools, and has the characteristics of convenient construction method and saving material consumption. In appearance, the two-way curved arch bridge has strong national cultural characteristics. The prefabricated components of the two-way curved arch bridge are fragmentary, complicated in bearing and poor in integrity. Most of the two-way curved arch bridges in service have been built for a long time and lack of maintenance and management. Increasing the cross-section reinforcement method is one of the two-way curved arch reinforcement methods. It has a significant effect, convenient construction, good rigidity and stability characteristics after the reinforcement. Through theoretical analysis, combined with a static load test results of the assessment of the bridge reinforcement effect. Through load test, it is found that the deflection of the arch rib after reinforcement is reduced by 9%~19% and the strain of the arch rib is reduced by 12%~22%. Through finite element calculation, the crack width of the reinforced arch rib decreases by 8.3%~14.2%. The results show that the stress and deflection are greatly improved by the method of increasing section.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 581-595
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing capacity and seismic performance of Y-shaped reinforced concrete bridge piers in a freeze-thaw environment
    Autorzy:
    Li, Yanfeng
    Li, Jialong
    Guo, Tianyu
    Zhao, Tongfeng
    Bao, Longsheng
    Sun, Xinglong
    Powiązania:
    https://bibliotekanauki.pl/articles/2203435.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    A quantitative study is performed to determine the performance degradation of Y-shaped reinforced concrete bridge piers owing to long-term freeze-thaw damage. The piers are discretized into spatial solid elements using the ANSYS Workbench finite element analysis software, and a spatial model is established. The analysis addresses the mechanical performance of the piers under monotonic loading, and their seismic performance under low-cycle repeated loading. The influence of the number of freeze-thaw cycles, axial compression ratio, and loading direction on the pier bearing capacity index and seismic performance index is investigated. The results show that freeze-thaw damage has an adverse effect on the ultimate bearing capacity and seismic performance of Y-shaped bridge piers in the transverse and longitudinal directions. The pier peak load and displacement ductility coefficient decrease with increasing number of freeze-thaw cycles. The axial compression ratio is an important factor that affects the pier ultimate bearing capacity and seismic performance. Upon increasing the axial compression ratio, the pier peak load increases and the displacement ductility coefficient decreases, the effects of which are more significant in the longitudinal direction.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 367--384
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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