A Novel Method for Prevention of Scouring Around Bridge Piers

摘要

Bridges are one of the most expensive and important elements on transportation system. One of the most destructive phenomenon that threats bridges’ stability is scouring around their piers on bed. Scouring has two essential reasons; primary one is exertion of shear stress by flow pattern around piers and secondary effect that causes developing and extending of scour pits is vertical wake vortexes that get shape in front, back and lateral sides of piers. One of common preventing method for scouring is ordinary horizontal collars, that in this paper it illustrated that these kinds of collars make flow to exert more intense shear stress to bed in compare with piers without collar. In this research for suggesting better method of prevention method, new shape of collar designed and its application validity determined by numerical analysis by Ansys-CFX ver 12.