Dynamic And Flutter Stability Analysis Of Cable- Stayed Bridge With Corrugated Steel Webs

Extradosed Cable-stated bridge with corrugated steel webs has advantages of light structure, weak stiffness, low damping. Its shape is very sensitive to the wind environment around. Because of big development of computer technology and hydromechanics, application of numerical modeling in wind engineering of bridge is far more established, it has broad application prospects..This paper is based on ChaoYangGou reservoir bridge, its style is prestressed concrete combined box beam Cable-stayed bridge. Midas/Civil finite element software is used to analyze bridge dynamic characteristic and CFD software Fluent is taken to research bridge response to forced vibration. The paper includes the following.Firstly, every parts of bridge is simplified, then simulation model of this bridge nonlinearity reasonable finished state is established then inherent frequency, vibration mode and other parameters reflecting bridge dynamic property are solved.Secondly, the method of establishing and implementation bridge wind-induced vibration model by CFD is analyzed. Simulating two dimension section and three-dimensional girder segment model, calculating three aerostatic coefficient under wind attack angles of 0°, ±4°, ± 8°,summarizing its transformation law.Finally, dynamic mesh technique of Fluent is used to solve moving boundary problem. Dynamic mesh method is established. Inflow velocity from 2m/s to 20m/s, lift and moment coefficient changing curves of definite vertical bending movement and definite reverse movement are solved. Flutter derivatives are recognized. Then flutter critical wind speed is calculated. Compared with standard calculation results, it is found that result meet the accuracy requirements. Control measures of flutter are come into question.