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ZHU Zhi-wen, HUANG Yan, LI Jian-peng, RUAN Shi-peng. Fatigue assessment of floorbeam cutout in orthotropic steel bridge deck based on hot-spot stress method[J]. Journal of Traffic and Transportation Engineering, 2018, 18(5): 25-34. doi: 10.19818/j.cnki.1671-1637.2018.05.003
Citation: ZHU Zhi-wen, HUANG Yan, LI Jian-peng, RUAN Shi-peng. Fatigue assessment of floorbeam cutout in orthotropic steel bridge deck based on hot-spot stress method[J]. Journal of Traffic and Transportation Engineering, 2018, 18(5): 25-34. doi: 10.19818/j.cnki.1671-1637.2018.05.003
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Fatigue assessment of floorbeam cutout in orthotropic steel bridge deck based on hot-spot stress method

doi: 10.19818/j.cnki.1671-1637.2018.05.003
  • 1.

    School of Engineering, Shantou University, Shantou 515063, Guangdong, China

  • 2.

    Engineering Management Center, Bureau of Public Works of Shenzhen Municipality, Shenzhen 518031, Guangdong, China

  • 3.

    School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China

More Information
  • Author Bio:

    ZHU Zhi-wen(1968-), male, professor, PhD, Zhuzw@stu.edu.cn

  • Received Date: 2018-05-02
  • Publish Date: 2018-10-25
    Abstract
  • Based on finite element analysis and stress monitoring data at fatigue details under random traffic flows, stress time histories for an area close to a floorbeam cutout of orthotropic steel bridge deck were obtained to analyze the peak stress distribution.Fatigue assessment at a floorbeam cutout was carried out based on the hot-spot stress obtained through the extrapolation formulas specified by the International Institute of Welding and the Det Norske Veritas, respectively.Suitable extrapolation formulas for hot-spot stress at floorbeam cutout were also investigated.Research result shows that under the passage of vehicles on deck, stress responses at floorbeam cutout are compressive, and the peak stress is high. A significant stressconcentration occurs at the free edge of floorbeam cutout, and an obviously nonlinear stress distribution appears in a small range along the critical section of floorbeam cutout.When using the hot-spot extrapolation formulas provided by the International Institute of Welding and the Det Norske Veritas, the hot-spot stress is overestimated and the estimated fatigue life is conservative due to their stress extrapolation points falling into the nonlinear distribution zone.All the stress extrapolation points of the proposed two-point linear extrapolation formula and three-point quadratic extrapolation formula are located on the linear distribution zone of the construction details stress.The first extrapolation point is located on one thickness of floorbeam away from the free edge of the cutout.The fatigue life at floorbeam cutout evaluated by this method agrees well with the observed cracking life of floorbeam cutout on a real bridge.When the hot-spot stress is employed to evaluate the fatigue life of floorbeam cutout of orthotropic steel bridge deck, the fatigue category of FAT90 and the proposed three points quadratic extrapolation formula are suggested.

     

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