Fatigue Considerations in the Design of Cable-Stayed Road-Rail Bridges with Orthotropic Steel Deck

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Fatigue Considerations in the Design of Cable-Stayed Road-Rail Bridges with Orthotropic Steel Deck

Chen, Xiaohu / Yin, Delan / Lai, Yaping / Liu, Xiaofei

With China's nationwide development of urban rail transit, several dual purpose road-rail major bridges have been or are being built in metropolitan areas and many more are yet to come. Most of these major bridges will be cable-stayed long-span structures with orthotropic steel deck. However, it has been lack of well recognized criteria and code specifications to fully accommodate their design process. Furthermore, fatigue considerations have not been clearly addressed in many cases because of the complexity to determine both fatigue load and resistance. Taking one such bridge currently under construction as an example, this paper proposes a practical fatigue design approach for dual purpose cable-stayed steel bridges by combining results from fatigue load definition, fatigue detail categorization, global and local structural analysis, fatigue strength determination, and its comparison to European standards.