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http://dx.doi.org/10.12989/sem.2022.84.5.605

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)
Publication Information
Structural Engineering and Mechanics / v.84, no.5, 2022 , pp. 605-618 More about this Journal
Abstract
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.
Keywords
form-finding; gridshell structure; interpretability methods; machine learning; regression;
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