Construction Simulation Analysis And Shear Lag Analysis Of Main Girder For Xiaoxihu Partial Cable-Stayed Bridge

Partial cable-stayed bridge is a new bridge structure worldwide which enjoys a combination characteristic of the stiffen continuous beam bridge and the flexible cable-stayed bridge. It works with cable intension and main girder in bending and shear. When the girder is stiff enough and has relatively high bearing capacity, fewer cables can be adopted; but more will be required if the girder is delicate and can't provide adequate capacity. Compared with continuous beam, partial cable-stayed bridge is characterized by its novel structur, long pan and simple construction method. And it is also more economical than the continuous beam bridge. Partial cable-stayed bridge has the advantages of less material consumption, easy construction and owning more stiffen main girders over the cable-stayed bridge. Based on the above, it can be concluded that the development of partial cable-stayed bridge will blaze a new path for our research on intermediate bridge structure between stiffen and flexible beam bridges and present more bridge form selection for bridge field overall development.This thesis presents simulation analysis over the construction process of Xiaoxihu Yellow River Bridge. The inner forces and stress of main girder structure under the most unfavorable load condition during construction is obtained. After analysis, it is noticed that concrete shrinkage and creep has a significant influence on the displacement of prestressed concrete bridge by cantilevered construction method and it must be taken into consideration during the main girder camber.Due to its broad deck and long cantilever at cross-section, it's one of problems that the highway prestressed concrete one-side cable-stayed bridge is always concerned by engineers for the cross-sectional shear lag effect. In this thesis, by taking Xiaoxihu partial cable-stayed bridge as the background, finite analysis results of prestressed concrete cable-stayed bridge at the low cable bent tower is established. As soon as internal forces of the important cross-section are known from construction partial result, shear lag analysis is carried out using three bar simulation method and then the shear lag distribution in the controlling cross-section is determined. The results are satisfactory. By comparative analysis and considering its easy operation, it is found that the three bar simulation analysis method is totally complete for the section estimation at primary design stage. The results that it introduces are inclined to conservativeness and can be applied for practical projects. This thesis can provide reference for similar bridge design and building.