Abstract
The shape and size of a collar is important to maximize its effect as a scour countermeasure. Current research shows that the depth of the scour hole is decreased by using rectangular collars around circular piers. This study determined the approximate optimum dimensions for rectangular collars to minimize the temporal trend of scouring around a pier model. Effects of different sizes of rectangular collars on a model pier were investigated both at the upstream and downstream of the flume. It was observed that irrespective of the rectangular collar dimensions the upstream and the downstream were estimated to be 0.86 and 1.42, respectively. The optimum collar width was estimated to be 2.8 times the diameter of the pier. By using this optimized collar dimension, the non-dimensional depth of scour reached a min value of 0.034 at 72 h. The reduction percentage of the scour depth reached 98% at 72 h.
Highlights
Bridges play an important role in transportation
Bridge piers scour in the unprotected condition
Experimental method was used to investigate the application of rectangular collars with different dimensions
Summary
Bridges play an important role in transportation. Every year many bridges fail, not for structural reasons, but due to the scouring of bed materials around their piers and abutments (Akib et al 2011; Zarrati et al 2006). Bridge failure during flood leads to disruption in transportation systems and cause loss of life and damage to property. More than 1000 bridges have collapsed over the past 30 years in the United States of America with 60% of those failures due to scour (Shirole, Holt 1991). Scouring is an important factor that must be considered in bridge design
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