Long-span Bridges In Ice Type And Aerodynamic Characteristics Research

In the highlands of freezing rain and some cold climate area construction of long-span suspension bridge, the bridge may freeze. The ice will change bridge cable or stiffening girder cross section shape, the unsteady aerodynamic shape could cause the wind-induced vibration of bridge, which threatened the safety of long-span Bridges in, therefore, the ice bridge wind resistance characteristics of the study is very necessary. In this paper, the research work mainly includes the following items:1. Ice forces of type research. Ice research related literature at home and abroad, make further understanding about the study of ice; Ice to wow home beach bridge as an example to test, data collection, analysis; Summed up the lasso freezes three main types: type A ice; Type B ice’s ice.2. The ice the aerodynamic characteristics of the stay cables of the research. For freezes three main types of cable, finite element models of lasso freezes, respectively. And with the commercial CFD software to carry on the numerical simulation, calculation of wind direction Angle of the lift coefficient and drag coefficient, and draw gas power coefficient and wind direction Angle between the high order polynomial curve. To fit the static aerodynamic coefficients of CFD calculation results about the Angle of high order polynomial synthesis.3. Ice girder aerodynamic characteristics of wind tunnel test research. In view of the two main girder ice type: the type D ice ice and E type, making ice segmental model respectively, and load and vibration wind tunnel test, wind tunnel tests study ice form the influence of the aerodynamic characteristics of the bridge girders. The three component coefficient, flutter, vortex vibration.