Nonlinear Dynamic Characteristics Finite Element Method Analysis Of Hybrid Girder Asymmetric Cable-stayed Bridge With Single Tower

The girder of hybrid girder cable-stayed bridge is composed of two different materials along the length of beam direction. The material of the main span is steel , while the side bay (or part of the main span) is concrete. Hybrid girder cable-stayed bridge has the advantage of large capacity across because of it's main span is steel, and the characteristics of playing the anchor role and reducing the cost of bridge construction because of the side span is concrete. Cable-stayed bridge have significant differences in the general structure of the system and mechanical properties of materials with the other beam bridge, which has its own characteristics about the wind, seismic performance, as well as vehicle vibration performance, and so on.Taking the Dongsha super major bridge in Guangzhou as an instance, this paper has a further research around the analysis of dynamic characteristic and Seismic Response of hybrid girder cable-stayed bridge with single pylon on the foundation of existing research.DongSha bridge in GuangZhou City is taken as an example to establish space dynamic calculaing models with ANSYS. and the influence of primary structural parameters to the self-vibration characteristics is analyzed through the application of the finite element analysis software. The results show that the arrangements of the auxiliary piers in the side spans can increase the structure rigidity greatly. And dilute the extent of cable stayed,tower,steel-concrete ratio have varying degrees of influence on self-vibration frequency.The study of cable-stayed bridge dynamic property provides fundamental theory for aseismatic design, wind resistance and analysis of vehicle vibration. Through the analysis of dynamic, it can reveal more truly the structure stresses and deflection under the effect of vehicles. Then it can figure the responses of bridge structure when earthquake and wind loads affected.The time-history analysis applied to the hybrid girder cable-stayed bridge, establish two kinds of model, which one consider the the auxiliary piers interaction and another not, compare and analyze the situation of the time analysis of them under three groups of seismic waves.