Smart Structures and Systems

  • 제28권6호
  • /
  • Pages.827-838
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  • 2021
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Indirect displacement monitoring of high-speed railway box girders consider bending and torsion coupling effects

  • Wang, Xin (School of Transportation Science and Engineering, Harbin Institute of Technology) ;
  • Li, Zhonglong (School of Transportation Science and Engineering, Harbin Institute of Technology) ;
  • Zhuo, Yi (China Railway Design Corporation) ;
  • Di, Hao (China Railway Design Corporation) ;
  • Wei, Jianfeng (China Railway Design Corporation) ;
  • Li, Yuchen (School of Transportation Science and Engineering, Harbin Institute of Technology) ;
  • Li, Shunlong (School of Transportation Science and Engineering, Harbin Institute of Technology)
  • 투고 : 2021.06.01
  • 심사 : 2021.09.17
  • 발행 : 2021.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

The dynamic displacement is considered to be an important indicator of structural safety, and becomes an indispensable part of Structural Health Monitoring (SHM) system for high-speed railway bridges. This paper proposes an indirect strain based dynamic displacement reconstruction methodology for high-speed railway box girders. For the typical box girders under eccentric train load, the plane section assumption and elementary beam theory is no longer applicable due to the bend-torsion coupling effects. The monitored strain was decoupled into bend and torsion induced strain, pre-trained multi-output support vector regression (M-SVR) model was employed for such decoupling process considering the sensor layout cost and reconstruction accuracy. The decoupled strained based displacement could be reconstructed respectively using box girder plate element analysis and mode superposition principle. For the transformation modal matrix has a significant impact on the reconstructed displacement accuracy, the modal order would be optimized using particle swarm algorithm (PSO), aiming to minimize the ill conditioned degree of transformation modal matrix and the displacement reconstruction error. Numerical simulation and dynamic load testing results show that the reconstructed displacement was in good agreement with the simulated or measured results, which verifies the validity and accuracy of the algorithm proposed in this paper.

키워드

과제정보

Financial support for this study was provided by NSFC [51922034, 51678204, and 51638007], Heilongjiang Natural Science Foundation for Excellent Young Scholars [YQ2019E025], and China Railway Design Corporation R&D Program [2020YY240603, 2020YY340619].

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