Orthotropic steel deck (OSD) structures are widely used in the bridge deck system of rail transit bridges. Reducing the amplitude of the stress intensity factor is the most effective method to improve the fatigue life of OSD structures. In order to explore the fatigue crack propagation of the OSD structure and the factors affecting the amplitude of the structural stress intensity factor, linear elastic fracture mechanics and Paris’ law is used for theoretical support in this paper. Firstly, a cable-stayed bridge of urban rail transit is taken as the research object, a full-scale segment model of the OSD structure is designed and static and fatigue tests are carried out. Based on the test data, the fatigue life of the structure is simulated and predicted. Finally, ABAQUS and Franc3D are used to analyze the influence of parameters, such as U-rib thickness, roof thickness and diaphragm thickness, of the OSD structure on the amplitude of the stress intensity factor. The test and FEM analysis results show that the thickness of diaphragm and the height of the U-rib have little effect on the fatigue life of the OSD structure, appropriately increasing the thickness of the top plate and U-rib has a positive significance for prolonging the fatigue life of the structure. In addition, it is also of reference value to the application of sustainability and the science of sustainable development.
Orthotropic steel deck (OSD) structures are widely used in the bridge deck system of rail transit bridges. Reducing the amplitude of stress intensity factor is the most effective method to improve the fatigue life of OSD structures. In order to explore the fatigue crack propagation of OSD structure and the factors affecting the amplitude of structural stress intensity factor, linear elastic fracture mechanics and paris law is used for theoretical support in this paper. Firstly, a cable-stayed bridge of urban rail transit is taken as the research object, and a full-scale segment model of OSD structure is designed and static and fatigue tests are carried out. Based on the test data, the fatigue life of the structure is simulated and predicted. Finally, ABAQUS and Franc3D are used to analyze the influence of parameters, such as U-rib thickness, roof thickness and diaphragm thickness of OSD structure, on the amplitude of stress intensity factor. The test and FEM analysis results show that, the thickness of diaphragm and the height of U-rib have little effect on the fatigue life of OSD structure, appropriately increasing the thickness of top plate and U-rib has a positive significance for prolonging the fatigue life of the structure.
In order to study the fatigue failure behavior and fatigue strength of orthotropic steel deck of urban rail transit steel bridge, a full-scale test model of orthotropic steel deck was established based on the main span beam of a cable-stayed bridge of urban rail transit. During the test, the stress values and the cracking condition of the structure was observed to evaluate the fatigue strength. The results show that there is no crack during 2 million external load cycles, the main tensile stress values of each key test point before and after each cycle have little difference. It shows that there is no obvious redistribution of stress, and the fatigue performance of the model under 2 million external load cycles meets the requirements, and has a certain safety reserve. The load amplitude was increased and another 1.5 million cycles were carried out. When the external load cycles to 3.25 million times, cracks appear at the joint of the plate and U-rib. When the external load cycles to 3.5 million times, cracks are found at the symmetrical position of the first crack, and the test is terminated. The paper provides theoretical and experimental basis for the same type of bridge.
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