Taking the Baling River Bridge as a background,the effects of upper and lower central stabilizing barriers on the flutter stability of long-span truss girder suspension bridge with a central-slot deck have been in- vestigated by a series of wind tunnel tests of sectional model.

In order to get the accurate equivalent rigidity characters of the truss-stiffening girder,finite element models of the truss-stiffening girder with different length were built,and then the theoretical formula for calculating the deformation of a cantilever girder under concentrate forces was adopted to evaluate the equivalent rigidity value of the truss girder.