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WANG Shi-chao, WANG Chun-sheng, WANG Qian, TIAN Xiao-feng, DUAN Lan. Flexural behaviors of full-scale prestressed concrete hollow slab girders with composite strengthening[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 31-41. doi: 10.19818/j.cnki.1671-1637.2018.02.004
Citation: WANG Shi-chao, WANG Chun-sheng, WANG Qian, TIAN Xiao-feng, DUAN Lan. Flexural behaviors of full-scale prestressed concrete hollow slab girders with composite strengthening[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 31-41. doi: 10.19818/j.cnki.1671-1637.2018.02.004
shu

Flexural behaviors of full-scale prestressed concrete hollow slab girders with composite strengthening

doi: 10.19818/j.cnki.1671-1637.2018.02.004
  • 1.

    Shaanxi Provincial Major Laboratory for Highway Bridge and Tunnel, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Tongchuan Transport Bureau, Tongchuan 727031, Shaanxi, China

More Information
  • Author Bio:

    WANG Shi-chao(1989-), male, doctoral student, lhywsc@gmail.com

    WANG Chun-sheng(1972-), male, professor, PhD, wcs2000wcs@163.com

  • Received Date: 2017-10-26
  • Publish Date: 2018-04-25
    Abstract
  • The flexural behavior experiments of three full-scale prestressed concrete hollow slab beams were carried out, including unreinforced girder, steel plate-concrete composite strengthening (SPCCS) girder, and steel plate-prestressed concrete composite strengthening (SPPCCS) girder.The strain, slip, crack distribution, bearing capacity, stiffness, and ductility at the critical position of each full-scale test girder were analyzed.According to the plastic failure characteristics of test girders, the effect of secondary loading was taken into account, and the calculation formulas of ultimate flexural capacities of full-scale test beams were proposed.Testresult shows that the failure modes of strengthened girders are plastic bending failure, and the deformations of mid-span cross-sections satisfy the plane cross-section assumption.The relative slips between the strengthening steel plate and the new concrete, the strengthening part and the original structure are less than 0.05 mm, all parts of test girders after strengthening can cooperatively work.Compared with the unreinforced girder, the ultimate flexural capacity of SPCCS concrete hollow slab girder increases by 1.08 times, and the value of SPPCCS concrete hollow slab girder increases by 1.43 times.Therefore, the composite strengthening can obviously improve the ultimate bearing capacity of test girder.Compared with the unreinforced girder, the ductility coefficients of 2 strengthening test girders increase by 21%, and when test load is 200 kN, the stiffnesses increase by 1.55 times and 3.07 times, respectively.Therefore, the composite strengthening can obviously improve the stiffness and ductility of test girder.Compared with SPCCS technology, SPPCCS technology can significantly improve the bearing capacity and stiffness of test girder in the service stage.For 2 strengthening test girders, the ratios of ultimate flexural capacities computed by using the proposed simplified formulas to the experimental values are 0.94 and 0.96, respectively.Therefore, the formulas can be used to accurately calculate and analyze the flexural behaviors of prestressed concrete hollow slab beams strengthened by SPCCS technology.

     

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