Study On The Stress Analysis Of Cable-Girder Structure And Fatigue Response For Space Antisymmetric Arch Cable-Stayed Bridge

With the growth of the national economy,urban bridges not only ease our daily transportation but also become landmarks in big cities.Among various beautiful styles of design,the space against the arch cable-stayed bridge is very popular because of its unique space shape.However due to the oblique span arch tower,the spatial against said cable plane layout of the bridge structure in force on the general cable-stayed bridge is more complex than,compared with the traditional bridge structure,design specification of reference are relatively poor and cable anchor beam Guan Qu and cable fatigue problem has been the focus of study in the field of engineering.This thesis presents in-depth study on cable-girder anchorage zone and fatigue response of cables including:1.In term of the new structure of space antisymmetric arch cable-stayed bridge,the stress analysis of cable-girder anchorage zone is carried out to find out the stress law and the advantages and disadvantages of 4 kinds of cable-girder anchorage zone.The reasonable structure design parameters are then obtained through studying the parameters of the structure of the cable-girder anchorage.2.In order to study the dynamic characteristics of the cable-stayed bridge,the finite element software Civil Midas is used to create the full bridge model.Meanwhile the nonlinear characteristics of the equivalent linear model are simulated by the equivalent linear model.The vibration characteristics of this new type of bridge are analyzed.The influence of the height of the arch tower on the basic frequency of the bridge and the horizontal force of the arch foot is obtained.3.This thesis proposes a new analysis model based on the Grover and Langer's bilinear cumulative damage theory and Corten-Dolan modified linear damage theory for the full bridge model.The fatigue responses of the cable under the influence of the crack growth,the action of the moving vehicle and the fluctuating wind load are studied respectively.The proposed method is verified by comparing the fatigue response of Langer and BS5400.In this thesis,a finite element model is established for the structure of space antisymmetric arch cable-stayed bridge.The design parameters of the cable-girder anchorage structure are optimized.The dynamic characteristics of this new type of bridge structure are obtained.An analytical model is presented to analyze the influence of crack growth on the fatigue life of cables.The research results guidance for the design of this new type of bridge.