Smart Structures and Systems

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Dynamic deflection monitoring method for long-span cable-stayed bridge based on bi-directional long short-term memory neural network

  • Yi-Fan Li (Department of Civil Engineering, Hefei University of Technology) ;
  • Wen-Yu He (Department of Civil Engineering, Hefei University of Technology) ;
  • Wei-Xin Ren (College of Civil and Transportation Engineering, Shenzhen University) ;
  • Gang Liu (China Design Group) ;
  • Hai-Peng Sun (China Design Group)
  • Received : 2022.06.03
  • Accepted : 2023.10.20
  • Published : 2023.11.25
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Abstract

Dynamic deflection is important for evaluating the performance of a long-span cable-stayed bridge, and its continuous measurement is still cumbersome. This study proposes a dynamic deflection monitoring method for cable-stayed bridge based on Bi-directional Long Short-term Memory (BiLSTM) neural network taking advantages of the characteristics of spatial variation of cable acceleration response (CAR) and main girder deflection response (MGDR). Firstly, the relationship between the spatial and temporal variation of the CAR and the MGDR is described based on the geometric deformation of the bridge. Then a data-driven relational model based on BiLSTM neural network is established using CAR and MGDR data, and it is further used to monitor the MGDR via measuring the CAR. Finally, numerical simulations and field test are conducted to verify the proposed method. The root mean squared error (RMSE) of the numerical simulations are less than 4 while the RMSE of the field test is 1.5782, which indicate that it provides a cost-effective and convenient method for real-time deflection monitoring of cable-stayed bridges.

Keywords

Acknowledgement

The paper is supported by National Natural Science Foundation of China (52378298), and Natural Science Fund for Distinguished Young Scholars of Anhui Province (2208085J20).

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