Aerostatic Stability Analysis Of Hybrid Girder Asymmetric Cable-stayed Bridge With Single Tower

Aerostatic Stability must be taken into consideration in the design of long-span cable-stayed bridge.Under strong wind loads,the influence of Cable-stayed bridge's geometric nonlinearity and load nonlinearity can not be ignored.The thesis based on the linear theory of aerostatic stability,combined the factors of the static wind load nonlinearity and the structure of the geometric nonlinearity,using incremental algorithm,internal and external double-layer iteration method,and also CFD software FLUENT to calculate cable-stayed bridge section three component coefficient.It uses the finite element software ANSYS to establish the entity model based on APDL language and makes a calculation on the asymmetry of hybrid girder cable-stayed bridge cable.What's more,the bridge was analyzed from aspects of morphological parameters and design parameters.The main research work includes:(1)The brief introductions about the development of cable-stayed bridge and its development direction are given in this thesis,and it also introduces the domestic and foreign research status of hybrid girder cable-stayed bridge.That this thesis expounds the structure characteristics and technology characteristics of hybrid girder cable-stayed bridge and on the basis of reviewing the relevant calculation theory of cable-stayed bridge proposed the significance and main content of this thesis.(2)A general method to solve nonlinear of aerostatic stability of the cable-stayed bridge and its aerostatic stability calculation model and the description of nonlinear buckling process and aerostatic stability's process and solution were introduced.At the same time,introducing the incremental and internal and external double-layer iteration method to calculate the basic steps and flow chart of the calm wind stability is also described.(3)This thesis expounds the engineering overview of the Dongsha Bridge in Guangzhou.By using the ANSYS FLUENT software,it calculates three component coefficients of Guangzhou Dongsha Bridge sections.And through the comparison between the wind tunnel tests data of Sutong Bridge in laboratory and computer numerical data which proved that the numerical wind tunnel is practicable and to some degree has certain accuracy.(4)The thesis utilizes ANSYS software to establish the east Saudi bridge finite element model.Then,it according to the second time development capabilities makes nonlinear aerostatic stability calculation procedure to analysis the aerostatic stability of East Saudi Bridge.And on the basis of different shape parameters and design parameters,analyzes its impact on east Saudi bridge's aerostatic stability.