Analysis On Spatial Stability And Dynamic Characteristics Of Fly-bird-type Tied-arch Bridge With Steel Box

The fly-bird-type arch bridge has attracted Widespread Attention of the bridge designer for its strong ability to adapt address conditions and its Beautiful appearance.In recent years,along with the use of new materials in Bridge field and the advancement of bridge construction technology,the span of this type of bridge has increased rapidly.At present,people have carried on a lot of research Thoroughly and comprehensiveil.But in the view of the stability is a prominent problems between Construction process,besides,there is no Specific provision about the impact coefficient in the Current design specification.this paper use the jiangcheng bridge as the background, do the following research on the two aspects:1. By reading a number of literature,have knowledge about the development course of the tied-arch bridge, Analysis the bridge case to state the mechanism of the kind of bridge. Summary related calculation theory in order to lay a solid foundation for the later research.2. Use the large finite element software of midas/civil to establish3D finite element model of the jiangcheng bridge. Modified to the related parameters of the bridge model,analysis the affection of these parameters’variations on the overall stability of this bridge. To ensure the smooth construction,analysis the stability of some main construction prosess.In addition,analysis the stability of the bridge under different decorate forms of moving load.3. In the present conditions, there is no Specific provision about the impact coefficient in the Current design specification. This article also do lots of work on the bridge’s dynamic response under the action of mobile load,it has simulate the situation of moving load at different speeds, different weight and different crane space. Analysis the time-history of curves and datas, Summarize the impact on the coefficient.In the same time,do some further analysis of the Impact load.