The Optimization Analysis Of Dynamic Characteristics And Stability Of Long-span Concrete-filled Steel Tube Arch Bridge

In our country, concrete filled steel tube arch bridge is a bridge to the development of the new bridge in recent years. As a kind of bridge has a broad prospect, concrete-filled steel tube arch bridge become the focus of our country in recent years the development of bridge structure. In our country in the field of highway, railway and urban bridge, the bridge of concrete filled steel tube arch bridge in the form of development very fast, not only on the number of increase year by year, across the ability has been improved. Structure of this kind of structure is more complex, however, can influence the internal force of structure, stability and dynamic performance has many aspects of factors, and compared with concrete filled steel tubular arch bridge engineering practice, its design theory research, especially the dynamic theory is lag, which is blocking the bridge of concrete filled steel tube arch bridge a further promoting factors cannot be ignored.In the design of concrete-filled steel tube arch bridge, due to its large number of design parameters, and mutual coupling relations between each parameter, in the process of plan adjustment will attend. Bridge should not only meet the requirements of static and dynamic performance and stability, and reasonable to do stress, the economic cost of target is very difficult.At present, the domestic and foreign scholars for the concrete-filled steel tube arch bridge is the main research direction for the shape optimization of arch axis, and the optimization of the main arch ring section is not a lot. In practical engineering, the arch rib section(steel tube diameter, steel tube wall thickness) mostly depends on the size of the engineering experience to choose, and the related department has not yet published in view of the special specification of concrete filled steel tube arch bridge, the structure is conservative when the design problem is widespread, it will cause the waste of resources. Based on the collected about the stability of the arch structure and dynamics theory, on the basis of the stability of the arch bridge was deduced and the solving steps of dynamic finite element numerical analysis method in the engineering background of Wang Po ditch occurrence, using the finite element analysis software ANSYS to establish a space model of bridge calculation of bridge span structure has carried on the analysis of dynamic characteristics and stability of the bridge arch axis, the arch rib section form, arrangement of lateral braces and quantity adjustment, design parameters, such as different design parameters on the structure of the influence of natural frequency of vibration and stability. On this basis, the optimization design of concrete filled steel tube arch bridge is discussed some ideas and methods, the design of this kind of bridge has a certain reference significance.