Structural Analysis Of Light Track Cable-stayed Bridge With Hybrid Girder And Detailed Stressanalysis Of Cable-Girder Anchorage

In this thesis,the development process of cable-stayed bridge and hybrid girder cablestayed bridge is briefly introduced,then the characteristics of hybrid girder cable-stayed bridge over conventional cable-stayed bridge are analyzed,and the design scheme of(52+68+340+66.5+50.5)m double towers and double cable planes cable-stayed bridge with hybrid girder is introduced.According to the design drawings,the finite element software MIDAS/CIVIL is used to establish a whole bridge model based on beam element.The simulation ideas and methods of the bridge tower,main girder,stay cables and load action are introduced in detail.Accurately simulating the construction stage,the deformation,internal force and stress of the bridge during the construction stage are calculated and analyzed.Meanwhile,the displacement,internal force and stress of the bridge tower,main girder and stay cables during the operation stage are calculated and analyzed,and relevant conclusions are obtained.The ’M method’ is used to simulate the pile-soil interaction and analyze the natural vibration characteristics at the finished stage.Referring to the European code,the response spectrum method and the linear time history method are used to calculate and analyze the displacement,internal force and stress of the bridge tower and main girder under the action of earthquake alone and combined with dead load,and the calculation results of the response spectrum method and the linear time history method are coMPared and analyzed,and relevant conclusions are obtained.This thesis briefly introduces the conventional cable-girder anchorage connection forms of cable-stayed bridges.According to the steel anchor box connection method adopted by the bridge,the parametric 3D modeling software SOLIDWORKS and the general finite element software ANSYS are used to establish the local detailed finite element model based on the combined element,respectively calculate and analyze the stress of each plate in the cable-girder anchorage zone under the action of dead load alone and combined with live load,and put forward relevant optimization suggestions.