Computer Simulation of Buffeting Responses for Long-span Continuous Rigid-frame Bridge with Over-height Pier

The continuous rigid frame bridges are more sensitive to wind action with the increase of bridge span and pier height. In order to calculate the wind induced buffeting responses, the fluctuating wind field at bridge site are simulated by harmonic synthesis method and the wind loads are also derived based on the simplified quasi-steady theory, the time-history dynamic responses of the bridge are calculated based on the computer software. The Hezhang bridge with 195m height pier is discussed in detail and the results indicate that the bridge with over-height pier is sensitive to wind action, the maximum displacement responses of construction state and the completion stage are 8.09cm and 3.39cm respectively and the fluctuating amplifying coefficient of construction phase is larger than the finished stage, the bridge is more sensitive to wind load during the construction stage.