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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2013  >  13(6): 20-27
YIN Guan-sheng, LIU Xiao-wei, HOU Xiu-hui. Fatigue analysis of steel bar in box girder under vehicle load spectrum[J]. Journal of Traffic and Transportation Engineering, 2013, 13(6): 20-27.
Citation: YIN Guan-sheng, LIU Xiao-wei, HOU Xiu-hui. Fatigue analysis of steel bar in box girder under vehicle load spectrum[J]. Journal of Traffic and Transportation Engineering, 2013, 13(6): 20-27.
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Fatigue analysis of steel bar in box girder under vehicle load spectrum

  • 1.

    School of Science, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    School of Civil Engineering, Chang'an University, Xi'an 710064, Shaanxi, China

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  • Author Bio:

    YIN Guan-sheng (1958-), male, professor, PhD, +86-29-82334135, yings@chd.edu.cn

  • Received Date: 2013-07-18
  • Publish Date: 2013-12-25
    Abstract
  • The vehicle load spectrum was obtained by using traffic survey. The forces of traveling vehicle tires on the ground could be taken as instantaneous half-sine impact loads. Based on the pressure distribution change curve in the longitudinal direction of tire on the ground, a theoretical formula of vehicle dynamic amplification factor (DAF) was deduced. Combining the transient analysis method, the dynamic response was calculated when vehicles with different axles passed through bridge, the cyclic axial stress curves of steel bars in box girder were achieved, and these curves were classified by using rain-flow counting method.S-N curve of steel bar was got through tests, and bridge service life was calculated by using linear cumulative damage theory. Numerical simulation result shows that without considering the roughness degree of pavement, dynamic amplification factor fluctuates near zero before resonance point, and it reaches the maximum at resonance point, then it decreases with the increase of speed. There are no adverse effects on bridge service life under non-overloading traffic.

     

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