The aerodynamic investigation including flutter and vortex-induced vibration performance of longspansuspension bridge with central-slotted box girder was carried out based on Xihoumen Bridgewith the main span of 1650m, which will be the longest box girder suspension bridge in the world.The flutter performance was investigated through sectional model wind tunnel tests and theoreticalanalysis. It is found that slot width has the most significant influence, and the variation of localaerodynamic configuration inside and outside the box girder section will also change the structuralflutter performance in some comprehensive way. Central stabilizers can further improve theaerodynamic stability of slotted box girder section, and the "combined types" of stabilizers arerecommended. Since heaving and torsional vortex-induced vibrations were observed when windspeed is relatively low, vibration control measure was investigated through wind tunnel tests.
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