Parameter Analysis And Dynamic Study Of Cable-Stayed Bridge With Oblique Pylon And Composite Beam

It is necessary to know the performance of a structure under static actions before its design. In order to reduce the project cost and decide the structure layout correctly, it is supposed to understand the changing trend of the structure performance when several selected parameters changed .This is called structure parameter analysis.In the first part of the dissertation, several parameters including dip angle of the oblique pylon, stiffness ratio of beam and pylon, non-cable area length at side-bearing of the main span are selected based on the characteristics of practical project. With these parameters, large sized finite element general program MIDAS CIVIL is used to analyze a practical bridge. The main contents include: the influence of the dip angle of the oblique pylon on internal force and displacements of structure and cable sag; the influence of the stiffness ratio of beam and pylon on structure internal force and displacements; the influence on structure internal force and displacements caused by the non-cable area length.In the Second part of the dissertation, starting with the basic principle of structure dynamic analysis, numerical methods of solution to dynamic characteristics together with simulation methods for the pylon, cable and beam of cable-stayed bridge in finite element program are introduced briefly. Besides, this part puts emphasis on discussing the accuracy of different elements in element stiffness and mass simulation, and the dynamic model for one practical bridge is utilized through large sized finite element general program MIDAS CIVIL. The dynamic characteristics of the practical bridge as well as the influence induced by the setting of auxiliary piers in the side span are analyzedIn the third part of the dissertation, seismic analysis methods are introduced first. Then, the dynamic model for one practical bridge is utilized through finite element general program MIDAS CIVIL. And response spectrum method is used in the calculation of the seismic response of Maxin bridge.