INCREASING STRUCTURAL SAFETY OF LONG-SPAN BRIDGES BY ACTIVE CONTROL

Abstract eng:
The effectiveness of active multiple mass damper system (AMMD) for suppressing wind-induced vibration response of long span bridges and, hence, increasing the structural safety will be investigated in the proposed research work. The three components of buffeting wind forces are numerically simulated using an improved algorithm introduced also in this paper. The target wind velocity field is assumed to be one-dimensional multivariate stochastic process. The fast Fourier transform is used to enhance the efficiency of computation. The equations of motion of the system with dampers will be introduced. A bridge mounted by AMMD and subjected to simulated wind forces is solved. A comparison between passive and active system is performed. Numerical example results reveal that the active control system performs better than its passive counterpart. Comments on the performance are finally made.

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