Flutter stability of a suspension bridge during construction

This work aims to infer some general considerations on flutter stability of long-span suspen-sion bridges, considering both the completed configuration and the erection phase. A main span length that is expected to become soon not so exceptional (about 1600 m) and a common closed-box deck cross section have been taken into account in the analysis. The bridge planned for the crossing of the Julsundet Fjord in Norway has been assumed as a case study. The inves-tigation revealed that stability against flutter is warranted without the need of particular opti-mizations except for the first phase of deck erection when this is started from the centre. In ad-dition, the flutter calculations emphasize the key role of mode coupling coefficients both in service and during the construction stages.