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Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (6): 1061-1070    DOI: 10.3785/j.issn.1008-973X.2023.06.001
    
Prediction model of axial bearing capacity of concrete-filled steel tube columns based on XGBoost-SHAP
Xi-ze CHEN1(),Jun-feng JIA1,*(),Yu-lei BAI1,Tong GUO2,Xiu-li DU1
1. Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China
2. School of Civil Engineering, Southeast University, Nanjing 211189, China
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Abstract  

To reliably and accurately predict the axial bearing capacity of concrete-filled steel tube (CFST) columns, a prediction model of CFST column axial bearing capacity with ensemble machine learning was developed and explained. The quality of the CFST column database was evaluated using the Mahalanobis distance, the prediction model of CFST column axial bearing capacity was established by the extreme gradient boosting (XGBoost) algorithm, and the optimal hyperparameter combination of the model was found using the K-Fold cross-validation (K-Fold CV) and the tree-structured Parzen estimator (TPE) algorithms. The predicted values of the optimized XGBoost model were compared with the calculated values of the existing methods and the unoptimized XGBoost model using different evaluation metrics. The Shapley additive explanations (SHAP) approach was used to produce both global and local explanations for the predictions of XGBoost model. Results show that, after hyperparameter tuning, the XGBoost model’s performance surpasses performance of relevant standards and empirical formulas, and the SHAP approach can effectively explain the XGBoost model’s output.



Key wordsconcrete-filled steel tube (CFST) column      axial bearing capacity      extreme gradient boosting (XGBoost)      hyperparameter optimization      Shapley additive explanations (SHAP)      interpretation     
Received: 10 June 2022      Published: 30 June 2023
CLC:  TU 375  
Fund:  国家重点研发计划项目(2019YFE0119800); 国家自然科学基金资助项目(52178449); 北京市自然科学基金资助项目(8202002)
Corresponding Authors: Jun-feng JIA     E-mail: chenxize@emails.bjut.edu.cn;jiajunfeng@bjut.edu.cn
Cite this article:

Xi-ze CHEN,Jun-feng JIA,Yu-lei BAI,Tong GUO,Xiu-li DU. Prediction model of axial bearing capacity of concrete-filled steel tube columns based on XGBoost-SHAP. Journal of ZheJiang University (Engineering Science), 2023, 57(6): 1061-1070.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.06.001     OR     https://www.zjujournals.com/eng/Y2023/V57/I6/1061


基于XGBoost-SHAP的钢管混凝土柱轴向承载力预测模型

为了可靠、准确地预测钢管混凝土(CFST)柱的轴向承载力,建立和解释集成机器学习的CFST柱轴向承载力预测模型. 使用马氏距离评估CFST柱数据库质量,通过极限梯度提升(XGBoost)算法建立CFST柱轴向承载力预测模型,使用K折交叉验证(K-Fold CV)和树结构概率密度估计(TPE)算法寻找模型的最优超参数组合. 采用不同评价指标将优化后XGBoost模型的预测值与已有方法和未优化XGBoost模型的计算值比较. 使用SHAP方法给出XGBoost模型预测结果的整体和局部的解释. 结果表明,经过超参数调整优化的XGBoost模型的性能超越了相关规范和经验公式的性能,且SHAP方法能够有效地解释XGBoost模型的输出.


关键词: 钢管混凝土(CFST)柱,  轴向承载力,  极限梯度提升(XGBoost),  超参数优化,  SHAP,  可解释性 
数据类型 Nu/kN D/mm δ/mm fy/MPa fc/MPa L/mm L/D
最小值 210.700 76.000 1.400 200.200 14.440 508.000 4.52
最大值 11460.000 355.600 12.800 604.670 106.000 5400.000 50.00
平均值 1188.439 135.971 4.554 343.590 42.629 1722.351 13.75
标准差 1163.190 48.673 2.389 64.394 15.745 963.988 8.672
Tab.1 Statistical information on parameters of concrete-filled steel tube column database
Fig.1 Parameter frequency distribution diagram for concrete-filled steel tube column database
Fig.2 Pearson correlation coefficient matrix for input and output parameters
Fig.3 Mahalanobis distance for sample of concrete-filled steel tube column database
Fig.4 Schematic description of K-Fold CV
Fig.5 Searching for optimal hyperparameter ranges of model by 10-Fold CV
Fig.6 Searching for optimal hyperparameter combinations of model by tree-structured Parzen estimator
Fig.7 Demonstration of XGBoost model performance after hyperparameter optimisation
Fig.8 Comparison between true and predicted values for nine methods at test dataset
模型 R2 RMSE MAE MAPE
文献[43] 0.854 315.651 231.706 27.047
文献[44] 0.768 397.773 323.111 38.605
文献[45] 0.785 382.387 320.920 36.873
文献[46] 0.857 382.387 320.920 36.873
文献[47] 0.854 315.720 244.594 36.944
文献[48] 0.844 325.718 251.056 37.057
文献[11] 0.920 233.976 195.502 24.078
文献[13] 0.922 230.704 176.394 18.555
本研究 0.963 157.958 93.989 10.388
Tab.2 Performance evaluation metrics for nine models
Fig.9 Changes in performance evaluation metrics before and after model optimization
Fig.10 SHAP summary plot of six input parameters
Fig.11 SHAP feature dependence plots of three input parameters
Fig.12 Graph of SHAP prediction interpretation for single sample
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