Volume 23 Issue 6
Dec.  2023
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ZHOU Yong-jun, XUE Yu-xin, GAO Xu-jun, LI Ran-ran, WANG Ye-lu, ZHAO Yu. Research on dynamic amplification factor of highway simply supported girder bridge based on modal superposition method[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 146-155. doi: 10.19818/j.cnki.1671-1637.2023.06.008
Citation: ZHOU Yong-jun, XUE Yu-xin, GAO Xu-jun, LI Ran-ran, WANG Ye-lu, ZHAO Yu. Research on dynamic amplification factor of highway simply supported girder bridge based on modal superposition method[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 146-155. doi: 10.19818/j.cnki.1671-1637.2023.06.008

Research on dynamic amplification factor of highway simply supported girder bridge based on modal superposition method

doi: 10.19818/j.cnki.1671-1637.2023.06.008
Funds:

National Key Research and Development Program of China 2021YFB2601000

National Natural Science Foundation of China 51978063

Natural Science Basic Research Project of Shaanxi Province 2021JLM-47

Fundamental Research Funds for the Central Universities 300102282108

More Information
  • Author Bio:

    ZHOU Yong-jun(1978-), male, professor, PhD, zyj@chd.edu.cn

  • Received Date: 2023-06-15
  • Publish Date: 2023-12-25
  • To explore the effect of modal orders on analyzing dynamic amplification factors (DAFs) of deflection and bending moment, simply supported T-girder bridges, box girder bridges, and hollow slab bridges with standard spans were selected as the research objects, and based on the modal superposition method, the DAF formula of simply supported girders under the action of three-axle vehicle was derived. The vehicle-bridge coupling vibration analysis program was compiled by using MATLAB software for numerical calculation, and the relationship of the DAFs of the deflection and bending moment with the order of modal truncation was studied under the influence of three factors, such as deck roughness, vehicle speed, and vehicle mass. In addition, the ratio relationship between two DAFs under different modal orders was analyzed and verified by the dynamic field test of a 30 m simply-supported box girder bridge. Research results show that the DAF of deflection is less affected by the modal order, and the contribution rate of the first-order mode to the DAF of deflection is 99%. When the modes at the first five orders are selected, the complete structural response information of the bridge can be obtained. However, the DAF of bending moment is greatly affected by the modal order, and the contribution rate of the first-order mode to the DAF of bending moment is 86%, while the contribution rate of the modes at the first five orders is 90%. Reliable results of DAF of bending moment are obtained when the modes at the first 25 orders or more are considered. The contribution rate of modal orders to the DAFs is affected by vehicle speed to some extent. The influences of deck roughness and vehicle mass on the convergence of the DAFs are not significant. The DAF of bending moment is less than that of deflection. When the first-order mode is selected, the ratio of the two is 0.86. When the modes at the first 15 orders are selected, the ratio of the two is 0.95. It is suggested to use the DAF of deflection under the same test condition. 2 tabs, 10 figs, 29 refs.

     

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