| 摘要 | 第5-6页 |
| Abstract | 第6-7页 |
| Chapter 1 Introduction | 第10-20页 |
| 1.1 Research background | 第10-11页 |
| 1.2 Research status in China and abroad | 第11-15页 |
| 1.2.1 A brief background on fatigue life of metal structures | 第11-12页 |
| 1.2.2 State of research on fatigue issues and fatigue reliability of steel bridges abroad | 第12-13页 |
| 1.2.3 Research status of fatigue issues and fatigue reliability of steel bridges in China | 第13-15页 |
| 1.2.4 State of research on stochastic traffic flow | 第15页 |
| 1.3 Research content and significance of this thesis | 第15-18页 |
| 1.4 Organizational structure of thesis | 第18-20页 |
| Chapter 2 Statistical analysis and simulation of stochastic traffic flow based on weigh-in-motion system | 第20-40页 |
| 2.1 Weigh-in-motion system | 第20-22页 |
| 2.1.1 Overview of weigh-in-motion system | 第20-22页 |
| 2.1.2 WIM system of a highway bridge | 第22页 |
| 2.2 Statistical analysis of traffic flow parameters | 第22-34页 |
| 2.2.1 Statistics and classification of vehicle category | 第23-25页 |
| 2.2.2 Statistics of lanes | 第25-26页 |
| 2.2.3 Statistics of the vehicle weights | 第26-32页 |
| 2.2.4 Statistics of the vehicle velocity and vehicle gap | 第32-34页 |
| 2.3 Prediction of traffic flow | 第34-36页 |
| 2.4 Simulation of the stochastic traffic flow | 第36-38页 |
| 2.5 Summary | 第38-40页 |
| Chapter 3 Finite element analysis for fatigue reliability based on stochastic traffic flow | 第40-72页 |
| 3.1 Orthotropic decks | 第40-42页 |
| 3.1.1 Overview of orthotropic decks | 第40-41页 |
| 3.1.2 Fatigue issues of orthotropic decks | 第41-42页 |
| 3.2 Finite element model for the analysis of fatigue reliability | 第42-51页 |
| 3.2.1 Parameters of an orthotropic deck | 第42-43页 |
| 3.2.2 The finite element model | 第43-44页 |
| 3.2.3 Category of fatigue details | 第44页 |
| 3.2.4 Stress response characteristics of the steel deck subjected to the vehicular load | 第44-47页 |
| 3.2.5 The influences of loading cases on details | 第47-51页 |
| 3.3 Methods of fatigue analysis | 第51-59页 |
| 3.3.1 Rainflow-counting algorithm to extract stress cycle | 第51-52页 |
| 3.3.2 S-N curve and Miner's rule | 第52-53页 |
| 3.3.3 Discussion and selection of S-N curves | 第53-59页 |
| 3.4 Equivalent fatigue stress range of different vehicle categories | 第59-62页 |
| 3.5 Fitting between axle weights and equivalent stress range | 第62-65页 |
| 3.6 Fatigue damage model of an orthotropic deck subjected to stochastic traffic loads | 第65-70页 |
| 3.6.1 Daily equivalent stress range S_(Deq) of orthotropic decks | 第65-69页 |
| 3.6.2 Daily fatigue damage of orthotropic decks | 第69-70页 |
| 3.7 Summary | 第70-72页 |
| Chapter 4 Fatigue reliability assessment of an orthotropic deck subjected to stochastic traffic loads | 第72-90页 |
| 4.1 Fatigue reliability of structures | 第73-77页 |
| 4.1.1 Structural reliability and failure probability | 第73-76页 |
| 4.1.2 Structural reliability and reliability index | 第76-77页 |
| 4.2 Theoretical foundation for fatigue reliability analysis of orthotropic decks | 第77-80页 |
| 4.2.1 Limit state function of fatigue failure subjected to traffic loads | 第77-78页 |
| 4.2.2 Monte Carlo methods | 第78-80页 |
| 4.3 Fatigue reliability analysis of orthotropic decks subjected to stochastic traffic loads | 第80-87页 |
| 4.3.1 Fatigue reliability index without considering the increment of traffic flow and loads | 第80页 |
| 4.3.2 Fatigue reliability index with considering the increment of traffic flow | 第80-83页 |
| 4.3.3 Fatigue reliability index with considering the increment of traffic loads | 第83-86页 |
| 4.3.4 Fatigue reliability index based on the prediction of traffic flow | 第86-87页 |
| 4.4 Fatigue life assessment of orthotropic decks under target reliability index | 第87-88页 |
| 4.4.1 Selection of the target fatigue reliability index | 第87-88页 |
| 4.4.2 Fatigue life assessment under target fatigue reliability index | 第88页 |
| 4.5 Summary | 第88-90页 |
| Chapter 5 Conclusions and recommendations | 第90-94页 |
| 5.1 Conclusions | 第90-91页 |
| 5.2 Recommendations | 第91-94页 |
| Acknowledgements | 第94-96页 |
| References | 第96-99页 |
