Improvement to Calculation Method of Flood Force on T-Girder Considering Entrapped Air in Chambers

Entrapped air in the chambers of a T-girder bridge generates considerably large vertical force which is harmful to safety superstructure. The contribution entrapped not considered when calculating flood related specifications, and also it has been taken into account by researchers. Two-dimensional, scaled-down models at 1:40 scale are selected as research object. Analytical numerical methods employed investigate forces. Results show that rear could escape easier than front compressibility small influence on drag (generated dynamic pressure) coefficients, but reduces buoyancy T-girder. Considering escape, calculation method proposed improve precision existing method.