A new system of multiple synchronized dynamic attenuators (MSDA) has been installed in the Rio-Niterói bridge to prevent that cross-winds of relatively low velocities set into vortex-inducedoscillations the lightly damped and remarkably long three continuous spans of the world's largeststeel twin-box-girder bridge. The conceptual design of this passive control system, together with itsmain geometric and physical characteristics, are briefly described herein. A short account is givenon how an experimentally calibrated mathematical-numerical model for the aeroelastic problem,combined with optimization techniques, were used to assist in designing feasible mechanicalcontrol devices to upgrade the serviceability of this bridge and users' comfort. The performance ofthe MSDA system is demonstrated through experimental measurements and comparisons ofnumerical results obtained for time responses of the original and the controlled structure.
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