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| Fatigue crack stochastic growth assessment of the orthotropic steel bridge deck based on Nonhomogeneous compound Poisson process model |
| Received:March 13, 2021 Revised:April 21, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210313001 |
| KeyWord:bridge engineering orthotropic steel deck overload nonhomogeneous Poisson process model stochastic fatigue |
| Author | Institution |
| 张海萍 |
湖南工业大学 土木工程学院, 株洲 |
| 刘扬 |
湖南工业大学 土木工程学院, 株洲 |
| 罗媛 |
湖南工业大学 土木工程学院, 株洲 |
| 郑辉 |
湖南工业大学 土木工程学院, 株洲 |
| 邓扬 |
北京建筑大学 土木与交通工程学院, 北京 |
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| Abstract: |
| The traditional fatigue damage assessment of orthotropic steel decks (OSD) commonly used deterministic and reliability analysis methods.The effect of stochastic fatigue crack propagation was ignored.For this reason,the article proposed a new stochastic fatigue crack propagation analysis method for OSD welds.Taking Nanxi Yangtze River Bridge as the project background,the non-homogeneous compound Poisson process model for the vehicle load was established based on the long-term vehicle load monitoring data.The finite element model of a steel bridge deck was established.Then,the OSD fatigue stresses under the vehicle loading were analyzed using a transient analysis.The time-varying differential equations for fatigue crack propagation from U rib to deck were derived based on the linear elastic fracture mechanics theory.Then,the macroscopic relationship fatigue stress amplitude times-fatigue damage was converted to the microscopic relationship stress time series-fatigue damage.The influences of vehicles order and overload on fatigue crack propagation are discussed.The research shows that the nonhomogeneous compound Poisson process model fit the operation state of random traffic flow well.The loading sequence is influential,for example,crack propagated faster when the higher vehicle load was at the front of a vehicle sequence.An overload correction factor of 0.804 is proposed for the Nanxi Yangtze River Bridge. |
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