Mechanical Analysis And Reserch Of Hybrid Girder Cable-Stayed Bridge With Singel Tower

Hybrid girder cable-stayed bridge is a new kind of cable-stayed bridge with pespective future. The girder is composed of two structures along the length direction. The main span is steel girder and the side span is concrete girder.In this dissertation, the thesis based on a hybrid girder cable-stayed bridge with single tower, used rninmum bending energy method which took the minimum stress of girder and tower in the finished dead state as the objective function to decide reasonable finished dead state. Analysis the internal force and displacement in every static load condition of structure, and then, the influence of parameters changs on the internal force and displacement is discussed in detail, which includes the length in the non-cables region closed to the obutment of the main span, the stiffness of the main girder and tower by FEM program MIDAS/CIVIL.The theories of dynamic characteristic and numerical methods are introduced. The three dimension finite element model is built by FEM program ANSYS, simulate the structure's mass and stiffness accurately, and analysis the nature vibration of the structure. At last, compared with theory results and the test results of the load experiment, makes the appraisal to the bridge performance.