Rain combined with wind action provoking vibration in stays is a phenomenon that has occurred in several cable-stayed bridges. In the last years such response has been also observed several times during stormy weather in the longest stays of the Alamillo cable-stayed bridge built in Sevilla (Spain) in 1992. The maximum displacements observed are in the order of magnitude of 0.5 m and have caused discomfort problems to the pedestrian circulation across the bridge, and may derive in important fatigue problems in the stays themselves in the future. The paper shows the magnitude of the problem, the analytical and experimental studies carried out to analyse the possible solutions and also the first steps developed to stop the vibration problem. The solution supposes the installation of dampers in the cables most prone to vibrate. The damping devices should be in accordance with the relevant aesthetic constraints of the structure.
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