Wake Study of Stiffening Truss and Box Girder

by Timothy A. Reinhold, Research Assoc.; Dept. of Engrg. Sci. and Mechanics, Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.,
Francis J. Maher, Prof.; Dept. of Engrg. Sci. and Mechanics, Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.,
Henry W. Tieleman, Assoc. Prof.; Dept. of Engrg. Sci. and Mechanics, Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.,


Serial Information: Journal of the Structural Division, 1976, Vol. 102, Issue 9, Pg. 1643-1657


Document Type: Journal Paper

Abstract: A 1:64 scale model of the William Preston Lane, Jr., Memorial Bridge was studied in the wind tunnel to determine possible downstream effects on a parallel structure. The model was tested in smooth flow and in a grid-induced turbulent flow with the model held rigidly and also in a mounting allowing torsional oscillation. A 3.1 to 1 box member was also tested in rigid configuration only. For the stationary truss model in turbulent flow, at a downstream distance of about 10 bridge widths, the wake is random in nature with somewhat higher turbulence intensities. For the smooth flow, significant effects are still noticeable at a spacing of over 13 widths, the maximum distance tested. The same conclusions obtained for the box, although at greater spacings. For the oscillating model in turbulent flow, a small effect remains at maximum distance, while strong effects remain for smooth flow at the same location. Testing real problems in turbulent flow is recommended.

Subject Headings: Turbulent flow | Oscillatory flow | Scale models | Structural models | Rivers and streams | Model tests | Oscillations | Trusses

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