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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2017  >  17(4): 55-65
LIN Shang-shun, HUANG Qing-wei, CHEN Bao-chun, CHEN Yang-hong. Design of U-RC composite pier of sea-crossing bridge[J]. Journal of Traffic and Transportation Engineering, 2017, 17(4): 55-65.
Citation: LIN Shang-shun, HUANG Qing-wei, CHEN Bao-chun, CHEN Yang-hong. Design of U-RC composite pier of sea-crossing bridge[J]. Journal of Traffic and Transportation Engineering, 2017, 17(4): 55-65.
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Design of U-RC composite pier of sea-crossing bridge

  • 1.

    Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China

  • 2.

    School of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

More Information
  • Author Bio:

    LIN Shang-shun(1972-), male, associate professor, PhD, +86-591-22863252, midas2008@126.com

    HUANG Qing-wei(1982-), male, associate researcher, PhD, +86-591-22865349, 9380226@qq.com

  • Received Date: 2017-03-22
  • Publish Date: 2017-08-25
    Abstract
  • In order to solve the construction and anti-corrosion problems of pier of sea-crossing bridge, a new structure of composite pier of ultra-high performance concrete (UHPC) and reinforced concrete (RC) (short for U-RC composite pier) was designed, and UHPC cylinder was taken as permanent cylinder to cast core reinforced concrete. The Pingtan Strait Bridge was taken as project background, the structure design and calculation of U-RC composite pier were carried out, and the workload and cost of U-RC composite pier were compared with the ones of original design scheme. The ultimate bearing capacity tests of three core reinforced concrete columns, three UHPC cylinders and three U-RC composite piers were carried out, the longitudinal andtransverse strains of concrete for the specimens were measured, the failure modes and the developments of cracks were observed, the test values of ultimate bearing capacities were obtained, and the mechanical properties of U-RC composite pier were analyzed. Research result indicates that the bearing capacity of U-RC composite pier is greater than the design value of internal force, which meets the current specification requirement. The design scheme that adopts UHPC cylinder to replace steel template, can save about 2 410 tof steel, and the total cost saves nearly 30%. The average bearing capacities of three UHPC cylinders and three RC columns are1 342 kN and 1 370 kN, respectively, and their sum is less than the average bearing capacity of three U-RC composite piers (3 033 kN), which indicates that the UHPC cylinder has certain confinement effect for core concrete, and it is feasible and conservative to calculate the ultimate bearing capacity of U-RC pier under axial compression with simple superposition method. In the axial compression experiment, the failure mode of U-RC composite pier is that the lateral deformation of core concrete leads to the vertical fracture of UHPC cylinder and the separation of UHPC and core concrete at the interface. At the ultimate load, the coating UHPC layers have vertical cracks that grow with the increase of the load, and the flaking and spalling phenomena of concrete appear. But when the U-RC composite pier is damaged, the longitudinal strain of coating UHPC does not reach the ultimate compressive strain.

     

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