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REDUCTION OF SCOUR AROUND A BRIDGE PIER BY MULTIPLE COLLAR PLATES
Scour around a bridge pier is one of the major possible causes of the hydraulic failures of a bridge. A typical sediment-water-structure interaction at the upstream junction of the bridge pier initiates a vortex system, the primary vortex of which is responsible for local scour around the pier. The growth of the primary vortex can be arrested by retaining it on a rigid surface as on a collar plate. A number of experiments covering various sizes of collar plates were carried out in an effort to minimize scour around a bridge pier. A collar plate of size three times the diameter of the circular pier, D or larger when placed at the average bed level assures 100% scour reduction while a collar plate of size 2D placed 0.1D below the bed does not allow scour depth to go beyond it. Anticipating degradation of general bed level, a group of multiple collar plates of smaller size were employed at the laboratory scale to reduce the scour considerably. A group of three collar plates of size 1,5D having an inter-plate spacing Cs of D/6 with the middle plate placed at the average bed level reduces scour by 83% in comparison to the scour depth of an unprotected pier. The composite device, apart from being axis symmetric, is highly suited to degrading river beds.
REDUCTION OF SCOUR AROUND A BRIDGE PIER BY MULTIPLE COLLAR PLATES
Scour around a bridge pier is one of the major possible causes of the hydraulic failures of a bridge. A typical sediment-water-structure interaction at the upstream junction of the bridge pier initiates a vortex system, the primary vortex of which is responsible for local scour around the pier. The growth of the primary vortex can be arrested by retaining it on a rigid surface as on a collar plate. A number of experiments covering various sizes of collar plates were carried out in an effort to minimize scour around a bridge pier. A collar plate of size three times the diameter of the circular pier, D or larger when placed at the average bed level assures 100% scour reduction while a collar plate of size 2D placed 0.1D below the bed does not allow scour depth to go beyond it. Anticipating degradation of general bed level, a group of multiple collar plates of smaller size were employed at the laboratory scale to reduce the scour considerably. A group of three collar plates of size 1,5D having an inter-plate spacing Cs of D/6 with the middle plate placed at the average bed level reduces scour by 83% in comparison to the scour depth of an unprotected pier. The composite device, apart from being axis symmetric, is highly suited to degrading river beds.
REDUCTION OF SCOUR AROUND A BRIDGE PIER BY MULTIPLE COLLAR PLATES
Garg, Vikas (author) / Setia, Baldev (author) / Verma, D. V. S. (author)
ISH Journal of Hydraulic Engineering ; 11 ; 66-80
2005-01-01
15 pages
Article (Journal)
Electronic Resource
Unknown
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