ABSTRACT

Long span suspension bridges are flexible structures which are highly sensitive to the action of the wind, hence aerodynamic performance often becomes a governing factor in the design process. The magnitude of the East Bridge, a 3 span suspension bridge of span lengths 535 m – 1624 m – 535 m, has warranted an aerodynamic design process which involves state-of-the-art model testing and analytical procedures. The present paper focuses on the use of wind tunnel test results in the design of the East Bridge. Particular attention is given to the strategy adopted for wind tunnel testing, and to selected results obtained. Considerations for the bridge in service cover aerodynamic stability, dynamic wind loads and vortex shedding response of the girder. For the erection phase aerodynamic stability of the girder is treated in some detail. Comparisons between model tests and analytical predictions are given and results are evaluated against current codes of practice. Finally, consideration is given to future wind tunnel testing and the extension and application of analytical procedures utilized in connection with the aerodynamic design process.