Pier sediment scour tests for Merrill-Barber Bridge final report
The objectives of this study were 1) to determine the maximum structure-inducedlocal sediment scour depths for the proposed bridge piers for the Merrill BarberBridge over Indian River on.State Road 60 in Indian River County, Florida and 2) todetermine the feasibility of predicting equilibrium local scour depths near complexmultiple pile bridge piers from bottom shear stresses on the prescoured bed. Aseries of hydrodynamic tests were conducted in a laboratory flume (100 ft long x 8 ftwide x 2 ft deep) where flow velocities near model piers were measured with a twocomponent constant temperature anemometer at a height of 3 mm above the bed. Bottomshear stresses were then estimated from the flow measurements. The piers (which are1/15 scale models of proposed Merrill Barber Bridge piers) consisted of thirtysixsquare piles (3 columns of 12) and a pile cap that was positioned at differentelevations above the bottom. Two different pile cap shapes were also considered. Asimple relationship between the prescoured bottom shear stress and the equilibriumlocal scour depth was postulated.Sediment scour tests were then conducted in the same flume with the samemodels. The average duration of these tests was 28 hours. Scour depths weremeasured periodically throughout these tests using an acoustic transponder. Thescour measurements were used 1) to establish the maximum scour depths for the MerrillBarber Bridge piers and 2) to calibrate and test the scour-shear stress relationship.Even though the range of conditions tested was somewhat limited, the approach appearspromising and should be pursued further. A number of interesting findings were maderegarding the rate at which scour occurs in these complex structures. (Document contains 134 pages.)
| Main Authors: | , |
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| Format: | monograph biblioteca |
| Language: | English |
| Published: |
University of Florida, Coastal and Oceanographic Engineering Department
1993
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| Subjects: | Engineering, Earth Sciences, scouring, bridges, Florida, Merril P Barber Bridge, |
| Online Access: | http://hdl.handle.net/1834/18405 |
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