Study On Design Parameters Of Big Spans Low-pylon Cable-stayed Bridge

Low-pylon cable-stayed bridge is also named partial cable-stayed bridge, which is a novel style bridge between box-girder bridge and cable-stayed bridge. Because of its advantageous structural function and favorable economical index, more and more developmental potential of the Low-pylon cable-stayed bridge is showing. On the basis of the collection, summarize and analysis of this kind of bridge's design datas in the world, according to the cable-stayed bridge's design theory, global design and design parameters of this kind of big spans PC Low-pylon cable-stayed bridge are analyzed in detail.In the first, the development and study of the style bridge is presented. Combined with the design and construction dates of this kind of bridge all over the world, Low-pylon cable-stayed bridge's main contents include of global arrange, structural characteristic, stressed property and its apply foreground in bridge engineering are discussed roundly.In the second, combined with the background engineering, this kind of big spans Low-pylon cable-stayed bridge's parameters affecting to structural internal force and distortion are analysed emphatically by using the big general finite element method software which is named Midas/Civil. The reasonable bound of these parameters include the active height of pagoda, the length of non-stayed cable segment and the ratio between the side span and the main span are found in the paper. What's more, viewed crank strain energy of the girder as object function, the optimal pagoda is founded through the analysis of the Low-pylon cable-stayed bridge's pagoda.In addition, according to the stable theory of the big spans bridge, the pagoda's height to the pagoda and girder's stability affection are discussed briefly. The conclusion that the pagoda and girder's bucking were not take place in the rensonable bound' of the radio between the pagoda heighe and the main span through the stability analysis of the pagoda and girder.At last, through the numerical analysis of the double thin-wall flexible pier of the Low-pylon cable-stayed bridge, the paper discusses the influence of the structural force and stability caused by the main design parameters. What's more, the Mathematics calculate programe is applied to get the protocol formula of these parameters.