Volume 24 Issue 6
Dec.  2024
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2024  >  24(6): 92-105
LIN Shang-shun, JI Bang-chong, LIU Jun-ping, LIN Jian-fan, ZHAO Jin-bing. Calculation method of instantaneous stiffness of steel reinforced ultra-high performance concrete beams with rectangular section[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 92-105. doi: 10.19818/j.cnki.1671-1637.2024.06.006
Citation: LIN Shang-shun, JI Bang-chong, LIU Jun-ping, LIN Jian-fan, ZHAO Jin-bing. Calculation method of instantaneous stiffness of steel reinforced ultra-high performance concrete beams with rectangular section[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 92-105. doi: 10.19818/j.cnki.1671-1637.2024.06.006
shu

Calculation method of instantaneous stiffness of steel reinforced ultra-high performance concrete beams with rectangular section

doi: 10.19818/j.cnki.1671-1637.2024.06.006
  • 1.

    School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China

  • 2.

    College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, Jiangsu, China

  • 3.

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

  • 4.

    Fujian Province Traffic Academy Co., Ltd., Fuzhou 350004, Fujian, China

  • 5.

    Haoyao Times (Fujian) Group Co., Ltd., Fuzhou 350002, Fujian, China

Funds:

National Natural Science Foundation of China 52078136

Traffic Science and Technology Project of Fujian Province 202024

More Information
  • Author Bio:

    LIN Shang-shun(1972-), male, professor, PhD, linshangshun@fjut.edu.cn

  • Corresponding author: JI Bang-chong(1995-), male, doctoral student, Jibangchong@163.com
  • Received Date: 2024-07-18
  • Publish Date: 2024-12-25
    Abstract
  • To study the instantaneous stiffness and calculation method of steel reinforced ultra-high performance concrete (SRUHPC) beams with rectangular section, five SRUHPC beam specimens and one reinforced ultra-high performance concrete (reinforced UHPC) beam specimen were fabricated. The reinforcement rates of the specimens ranged from 0.8% to 1.1%. The built-in structural steel was in the shapes of I-beam, inverted T-beam, and H-beam, with steel content ranging from 8.7% to 15.6%. The flexural test was carried out. The deformation patterns of SRUHPC beam specimens with rectangular section and reinforced UHPC beam specimen, and the effect of the change of design parameters on the stiffness of SRUHPC beam specimens, were analyzed. Based on the test result and the stiffness analysis method, the simplified calculation method for the instantaneous stiffness of SRUHPC beams with rectangular section was proposed. Under service loads, the maximum deflections of 13 SRUHPC beam specimens, including 8 specimens from literature, were calculated, and the calculated results were compared with the test values. Analysis results show that, under the same load, compared with the reinforced UHPC beam specimen, the deflections of SRUHPC beam specimens with rectangular section reduce by 16%-72%. The stiffnesses of SRUHPC beam specimens with rectangular section decrease by up to 7% due to section cracking, which is not obvious. Similar to the longitudinal tensile reinforcement, the tensile side portion of structural steel can also resist some tensile force when the SRUHPC beam specimens with rectangular section are loaded, thus inhibiting crack development in the beams and reducing the loss of stiffness due to cross-section cracking. The proposed method for the instantaneous stiffness yields an average ratio of 1.041 for deflection calculation values to test values, and the ratio variance is 0.017. Therefore, these calculated values are in good agreement with the test values, and the proposed method has higher accuracy than the existing calculation methods in literature.

     

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