Steel and Composite Structures

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Vibrational energy flow in steel box girders: Dominant modes and components, and effective vibration reduction measures

  • Derui Kong (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Xun Zhang (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Cong Li (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Keer Cui (Department of Bridge Engineering, Southwest Jiaotong University)
  • Received : 2023.03.21
  • Accepted : 2023.11.14
  • Published : 2024.02.10
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Abstract

Controlling vibrations and noise in steel box girders is important for reducing noise pollution and avoiding discomfort to residents of dwellings along bridges. The fundamental approach to solving this problem involves first identifying the main path of transmission of the vibration energy and then cutting it off by using targeted measures. However, this requires an investigation of the characteristics of flow of vibration energy in the steel box girder, whereas most studies in the area have focused on analyzing its single-point frequency response and overall vibrations. To solve this problem, this study examines the transmission of vibrations through the segments of a steel box girder when it is subjected to harmonic loads through structural intensity analysis based on standard finite element software and a post-processing code created by the authors. We identified several frequencies that dominated the vibrations of the steel box girder as well as the factors that influenced their emergence. We also assessed the contributions of a variety of vibrational waves to power flow, and the results showed that bending waves were dominant in the top plate and in-plane waves in the vertical plate of the girder. Finally, we analyzed the effects of commonly used stiffened structures and steel-concrete composite structures on the flow of vibration energy in the girder, and verified their positive impacts on energy regionalization. In addition to providing an efficient tool for the relevant analyses, the work here informs research on optimizing steel box girders to reduce vibrations and noise in them.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China [grant No. 51978580].

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