Flutter derivatives of distortionable twin-box bridge decks from URANS simulations

As bridges are projected to span more than 2 km in the near future, flutter effects are becoming increasingly significant in the design of these structures. Although it is known that twin-box decks are more stable against this phenomenon, there is a need for extra flutter mitigation strategies. We propose a novel mitigation strategy that involves allowing controlled distortion of a twin-box deck. In this concept, it is assumed that each box maintains an undeformable cross-section, but a system of bars and springs enables relative displacement between the boxes. Preliminary results using the flat-plate analytical derivatives are promising; however, further validations through simulations and experimental results are necessary. To advance this, we present the results of an extensive URANS simulation campaign carried out to obtain the flutter derivatives of 18 distortionable bridge decks and explore potential setups for ensuing physical experiments. The efficiency of URANS simulations allows for the exploration of wide range of cross-section designs, with the aim of detecting which kind of geometries are ideal for the proposed distortion strategy. These simulations lay the groundwork for subsequent wind tunnel experiments, which will be carried out as part of the ERIES-DisDeck project at the “Giovanni Solari” Wind Tunnel of the University of Genova (UniGe).     «

As bridges are projected to span more than 2 km in the near future, flutter effects are becoming increasingly significant in the design of these structures. Although it is known that twin-box decks are more stable against this phenomenon, there is a need for extra flutter mitigation strategies. We propose a novel mitigation strategy that involves allowing controlled distortion of a twin-box deck. In this concept, it is assumed that each box maintains an undeformable cross-section, but a system o...     »