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WANG Shi-chao, WANG Chun-sheng, DUAN Lan, SHEN Jian-cheng, WANG Qian. Flexural behavior experiment of full-scale PC box girder strengthened by composite technique[J]. Journal of Traffic and Transportation Engineering, 2018, 18(5): 56-65. doi: 10.19818/j.cnki.1671-1637.2018.05.006
Citation: WANG Shi-chao, WANG Chun-sheng, DUAN Lan, SHEN Jian-cheng, WANG Qian. Flexural behavior experiment of full-scale PC box girder strengthened by composite technique[J]. Journal of Traffic and Transportation Engineering, 2018, 18(5): 56-65. doi: 10.19818/j.cnki.1671-1637.2018.05.006
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Flexural behavior experiment of full-scale PC box girder strengthened by composite technique

doi: 10.19818/j.cnki.1671-1637.2018.05.006
  • 1.

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

  • 2.

    Laboratory of Maintenance and Safety of Structures, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Vaud, Switzerland

  • 3.

    Ningxia Highway and Bridge Corporation, Yinchuan 750016, Ningxia, 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: 2018-06-13
  • Publish Date: 2018-10-25
    Abstract
  • In order to solve the problem of declining structural performance of old concrete girder bridges, a full-scale test was conducted to investigate the flexural behavior of small PC box girders strengthened by the steel plate-concrete composite strengthening (SPCCS) technology.Two full-scale 20 m-span small PC box girders strengthened by the SPCCS technique were tested to research their bending properties, the test result was compared with the full-scale test results of an unstrengthened girder and a prestressed CFRP (carbon fiber reinforce plastic) strengthened girder, the flexural behavior of full-scale SPCCS box girders was analyzed, and the straindistributions of strengthening steel plates, major reinforcements of original girder, concrete and reinforcements at the top flange, and connection sturctures at the mid-span section in the whole loading process were studied.Based on the full-scale test results, the simplified calculation formulas of flexural capacity of SPCCS full-scale small PC box girder was established.Research result shows that the SPCCS girders fail in the plastic flexural mode.Compared with the unstrengthened girder, the measured ultimate flexural capacity of SPCCS full-scale test beam increases by more than 76%, and the stiffness in normal usage stage increases by more than1 time, therefore, the composite strengthening can obviously improve the flexural capacity of PC box girder.The strain distribution of mid-span section for test girder is in accordance with the plane cross-section assumption.The longitudinal relative slip between the composite strengthened part and the web of concrete box girder is less than 0.6 mm, therefore, the SPCCS girder has good integral working performance.The ratios of the measured and calculated ultimate flexural capacities of 2 full-scale test girders are 1.06 and 1.01, respectively, so the simplified formulas are reliable and can be used to calculate and analyze the bearing capacity of PC box girder strengthened by the composite strengthening.

     

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