Study Of Fatigue Behaviour On Structural Details Of Orthotropic Steel Bridge Deck On High-speed Railway Bridges

Because of its complex configurations, the direct action of wheel load, the orthotropic steel bridge deck of highway bridges is prone to crack. The orthotropic steel bridge deck is widely applied in long-span bridges in Germany, Japan, the United States and other developed countries from the1960s. However, the fatigue craeks appeared since the bridges had been completed, many scholars have a lot of research on the fatigue problem of the orthotropic steel bridge deck, and achieved much progress and results in this field, the most of the fatigue crack have been avoided.Orthotropic steel bridge deck with light weight, good wholenes is used not only to highway bridges, but also to more and more high-speed railway bridges in recent years in China. Because of the different loads and structural details between highway bridges and high-speed railway bridges, the fatigue problems on orthotropic steel bridge deck of high-speed railway bridges need further research, the following contents are the ones that this thesis focuses on:①The related theories and methods about fatigue design of orthotropic steel bridge deck are introduced;②This thesis is studied on the fatigue behavior of Nanjing Dashengguan Yangtze River Bridge, by establishing ansys finite element models of orthotropic steel bridge deck to calculate the stress history of key struetural details under moving ioad of trains, the research of fatigue behavior is determined by using S-N curve method based on Miner norm;③Because of the shear studs between concrete solid plate and the bridge deck may be failure, if the composite deck structure is damaged, it will be very difficult to replace, and in the process of manufacture and installation the precision of steel bridge deck is hard to control, this thesis establish three finite element models of different structural details of orthotropic steel bridge deck, in order to calculate the stress history of key structural details under moving load of trains in the different situations, and analyz the fatigue behavior.