Structural Engineering and Mechanics

  • 제84권5호
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  • Pages.605-618
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  • 2022
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Form-finding of lifting self-forming GFRP elastic gridshells based on machine learning interpretability methods

  • Soheila, Kookalani (Department of Civil Engineering, Shanghai Jiao Tong University) ;
  • Sandy, Nyunn (Department of Civil Engineering, Shanghai Jiao Tong University) ;
  • Sheng, Xiang (Department of Civil Engineering, Shanghai Jiao Tong University)
  • 투고 : 2022.04.15
  • 심사 : 2022.11.04
  • 발행 : 2022.12.10
⟨ 이전 논문 다음 논문 ⟩

초록

Glass fiber reinforced polymer (GFRP) elastic gridshells consist of long continuous GFRP tubes that form elastic deformations. In this paper, a method for the form-finding of gridshell structures is presented based on the interpretable machine learning (ML) approaches. A comparative study is conducted on several ML algorithms, including support vector regression (SVR), K-nearest neighbors (KNN), decision tree (DT), random forest (RF), AdaBoost, XGBoost, category boosting (CatBoost), and light gradient boosting machine (LightGBM). A numerical example is presented using a standard double-hump gridshell considering two characteristics of deformation as objective functions. The combination of the grid search approach and k-fold cross-validation (CV) is implemented for fine-tuning the parameters of ML models. The results of the comparative study indicate that the LightGBM model presents the highest prediction accuracy. Finally, interpretable ML approaches, including Shapely additive explanations (SHAP), partial dependence plot (PDP), and accumulated local effects (ALE), are applied to explain the predictions of the ML model since it is essential to understand the effect of various values of input parameters on objective functions. As a result of interpretability approaches, an optimum gridshell structure is obtained and new opportunities are verified for form-finding investigation of GFRP elastic gridshells during lifting construction.

키워드

과제정보

The research work was supported by the National Natural Science Foundation of China (project No. 51978400) and the National Key Research and Development Program of China (project No. 2021YFE0107800). The support is gratefully acknowledged.

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