• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 57 Issue 4
Jul.  2022
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Article Contents
MEI Hanyu, WANG Qi, LIAO Haili, ZHANG Yan. Flutter Derivative Prediction of Flat Box Girder Based on Ensembled Neural Network[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 894-902. doi: 10.3969/j.issn.0258-2724.20200408
Citation: MEI Hanyu, WANG Qi, LIAO Haili, ZHANG Yan. Flutter Derivative Prediction of Flat Box Girder Based on Ensembled Neural Network[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 894-902. doi: 10.3969/j.issn.0258-2724.20200408

Flutter Derivative Prediction of Flat Box Girder Based on Ensembled Neural Network

doi: 10.3969/j.issn.0258-2724.20200408
  • Received Date: 04 Sep 2020
  • Rev Recd Date: 10 Nov 2020
  • Publish Date: 11 Nov 2020
  • Flat box girder has been used in most long-span bridge because of its excellent flutter performance. To facilitate bridge designers to quickly evaluate the flutter performance of flat box girders in the preliminary design stage of long span bridges, a deep neural network model based on ensemble learning was proposed for quickly predicting flutter derivatives of flat box girders. Firstly, the flutter derivatives of 15 typical flat box girders were obtained by forced vibration wind tunnel tests, and the accuracy of flutter derivatives was verified by combining the free vibration wind tunnel test and two-dimensional flutter analysis. Then, a flutter derivative dataset with the size of 525 was constructed based on wind tunnel testing data. The proposed ensemble deep neural network model was trained and tested based on the dataset. The results show that the proposed ensemble deep neural network model can accurately and quickly predict the 8 flutter derivatives at different reduced wind speeds by relying only on the box geometry properties of the flat box girder, and only using 60% of the training dataset for training can obtain acceptable prediction results with enough precision. Compared with the traditional polynomial regression model and the single artificial neural network model, the ensemble deep neural network model proposed in this paper has higher prediction accuracy and can be directly applied to the geometry selection and flutter prediction procedure in the preliminary design stage of bridges.

     

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