Finite Element Modeling And Structural Stiffness For Long-Span Railway Plate-Truss Cable-Stayed Bridge

Truss with orthotropic steel bridge deck is one of the relatively reasonable structural types for long-span bridges of high-speed railways, due to its great rigidty, good integrity, excellent dynamic behavior, making low noise, etc.Firstly, the thesis reviews the development of rail-road steel truss bridge systematically and summarizes the structural and the mechanical properties of plate-truss composite. Also the research status of calculation method was summarized.Secondly, on the basis of finite element method, the thesis introduces the modeling method for plate-truss cable-stayed bridges, and establishs spacial finite element model, and then The analysis is made in detail for mechanical behavior of this model.Then, the thesis makes a dynamic analysis for the plate-shell element model, and put forward a pratically simplified model, and evaluates this model from three aspects including overall stress, bridge floor system stress and dynamic property.Finally, according to these parameters such as beam width, beam depth, bridge floor system, cables, auxiliary pier and concrete slab, the thesis discusses the static and dynamic influence on the structural dynamic property and vehicles-bridge system response. At last, investigating the relevant examples about stiffness parameters value domestic and overseas, partial stiffness parameters are summarizd.