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研究生: 朱文漢
JUSIEANDRA - PRIBADI PAMPANG
論文名稱: Predicting Tensile Loads in Reinforcement for Geosynthetic-Reinforced Soil Structures by Evolutionary Metaheuristic Intelligence Model
Predicting Tensile Loads in Reinforcement for Geosynthetic-Reinforced Soil Structures by Evolutionary Metaheuristic Intelligence Model
指導教授: 周瑞生
Jui-Sheng Chou
口試委員: 楊立人
Li-Ren Yang
葛宇甯
Yu-Ning Ge
周建成
Chien-Cheng Chou
楊國鑫
Kuo-Hsin Yang
學位類別: 碩士
Master
系所名稱: 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年: 2014
畢業學年度: 102
語文別: 英文
論文頁數: 181
中文關鍵詞: Reinforcement loadsgeosynthetic reinforced soil structuresmachine learningoptimizationevolutionary metaheuristic intelligence.
外文關鍵詞: Reinforcement loads, geosynthetic reinforced soil structures, machine learning, optimization, evolutionary metaheuristic intelligence.
相關次數: 點閱:251下載:3
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Accurately estimating reinforcement tensile loads is crucial for evaluating the internal stabilities of geosynthetic-reinforced soil (GRS) structures. This study developed an evolutionary metaheuristic intelligence model for efficiently and accurately estimating reinforcement loads. The proposed model improves the prediction capability of the firefly algorithm (FA) by integrating intelligent components, namely chaotic maps, adaptive inertia weight, and Lévy flight. The enhanced FA is then used to optimize the hyperparameters for support vector regression (SVR) model. The proposed model was validated using a database of 15 wall case studies (totally 94 data points) via cross-validation algorithm and hypothesis test. The method was then compared with conventional prediction methods in terms of accuracy in predicting reinforcement tensile loads in GRS structures. The validation results showed that the proposed model had superior accuracy and mean absolute percentage errors below 7%. Moreover, comparison with the baseline models and prior literature indicated that the evolutionary metaheuristic intelligence model had a significant improvement of 26.15% to 96.90% in root mean square errors. This study validates the effectiveness of the proposed model of reinforcement tensile loads and its feasibility for facilitating early designs of construction structures.


Accurately estimating reinforcement tensile loads is crucial for evaluating the internal stabilities of geosynthetic-reinforced soil (GRS) structures. This study developed an evolutionary metaheuristic intelligence model for efficiently and accurately estimating reinforcement loads. The proposed model improves the prediction capability of the firefly algorithm (FA) by integrating intelligent components, namely chaotic maps, adaptive inertia weight, and Lévy flight. The enhanced FA is then used to optimize the hyperparameters for support vector regression (SVR) model. The proposed model was validated using a database of 15 wall case studies (totally 94 data points) via cross-validation algorithm and hypothesis test. The method was then compared with conventional prediction methods in terms of accuracy in predicting reinforcement tensile loads in GRS structures. The validation results showed that the proposed model had superior accuracy and mean absolute percentage errors below 7%. Moreover, comparison with the baseline models and prior literature indicated that the evolutionary metaheuristic intelligence model had a significant improvement of 26.15% to 96.90% in root mean square errors. This study validates the effectiveness of the proposed model of reinforcement tensile loads and its feasibility for facilitating early designs of construction structures.

TABLE OF CONTENTS ABSTRACT i ACKNOWLEDGEMENTS ii LIST OF FIGURES vii LIST OF TABLES viii ABBREVIATIONS AND SYMBOLS ix CHAPTER 1 INTRODUCTION 1 1.1. Research background 1 1.2. Research objectives 5 1.3. Research process 6 CHAPTER 2 LITERATURE REVIEW 7 2.1. Current practice in prediction of reinforcement tension loads 7 2.2. Data mining and artificial intelligence-based approaches 8 2.3. Hybrid computational model 9 CHAPTER 3 METHODOLOGY 11 3.1. Regression-based models 11 3.1.1. Classification and regression tree 11 3.1.2. Generalized linear regression 12 3.1.3. Support vector regression 12 3.1.4. Ensemble regression models 16 3.2. Evolutionary metaheuristic regression model 17 3.2.1. Firefly algorithm 17 3.2.2. Smart components 19 3.2.2.1. Chaotic maps 19 3.2.2.2. Adaptive inertia weight 19 3.2.2.3. Lévy flights 20 3.2.2.4. Combination of smart components with firefly algorithm 21 3.2.2.5. Benchmark functions 23 3.2.3. Smart firefly algorithm in optimization of support vector regression 28 3.3. Prediction performance and evaluation methods 31 3.3.1. Cross fold validation 31 3.3.2. Performance measures 31 3.3.3. Hypothesis testing 33 CHAPTER 4 DATA ANALYSIS AND RESULTS 34 4.1. Data description and pre-processing 34 4.2. Model construction 34 4.3. Comparisons of models and conventional methods 40 4.3.1. Analytical results 40 4.3.2. Discussion 44 CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS 49 5.1. Conclusions 49 5.2. Future research and recommendations 50 REFERENCES 51 APPENDIX A. Analytical results of benchmark functions 64 APPENDIX B. Original dataset from literature. 73 APPENDIX C. Performance measure via cross-fold for dataset using baseline AI models and ensemble models – validation dataset. 75 APPENDIX D. Performance measure via cross-fold for original data using SFA-SVR model. 76 APPENDIX E. Performance measure via cross-fold for dataset with 8 new sample data using baseline AI models and ensemble models – test dataset. 77 APPENDIX F. Performance measure via cross-fold for dataset with 8 new sample data using SFA-SVR. 78 APPENDIX G. Typical modeling in IBM SPSS Modeler (Clementine 12.0) via cross-fold. 79 APPENDIX H. The generation of fireflies in 10-cross fold of SFA-SVR for 8 new datapoints. 80 APPENDIX I. Interface of SFA-SVR algorithm analysis process in MATLAB. 81 APPENDIX J. MATLAB Code. 82 APPENDIX K. Tutorial PPT 99 LIST OF FIGURES Figure 1 1. Design model of GRS structure. 2 Figure 3 1. Architecture of a regression machine constructed by support vector algorithm. 14 Figure 3 2. The contour of bukin function No. 6. 26 Figure 3 3. Framework of the SFA-SVR model. 30 Figure 3 4. Ten-fold cross-validation method. 32 Figure 4 1. Flowchart of modeling stream for baseline models. 37 Figure 4 2. The SFA-SVR schemes and partial algorithms. 38 Figure 4 3. Performance comparison of baseline and ensemble models. 43 Figure 4 4. Cross section of GRS test wall. 45 Figure 4 5. Performance comparison of the proposed models and prior prediction methods in predicting Tmax at reinforcement layer 3 based on 8 new data samples. 48 LIST OF TABLES Table 3 1. Numerical benchmark functions 23 Table 3 2. Hypothesis testing results of optimum for the SFA model. 28 Table 4 1. Sources of datasets reported in the literature. 35 Table 4 2. Statistical attributes of GRS dataset. 36 Table 4 3. Default parameter settings in baseline models. 36 Table 4 4. Parameters settings for SFA-SVR algorithm. 40 Table 4 5. Summary of cross-fold modeling performance for baseline, ensemble and proposed models. 41 Table 4 6. Optimal values of C and σ for ten folds. 43 Table 4 7. The 8 new sample datasets from GRS test wall. 44 Table 4 8. Hypothesis testing for prediction models improvement in 8 new data points. 47

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