TO STUDY THE EFFECTS OF INCLINATION OF A BRIDGE PIER ON LOCAL SCOURING AROUND THE BRIDGE PIER

Abstract

In this experimental work, we used three pier of same dimensions but different shapes i.e., circular, octagonal and square. The octagonal shaped pier was purposely used so as to make it a transitional shape from smooth circular pier to sharp edged square pier. Each pier was founded in a test section inside the hydraulic flume and inclined to desired angle by using a pier inclining model. The experimental runs were carried out on three different discharge values in the hydraulic flume. Water was allowed to flow in the flume for 4 hours and after 4 hours, readings were taken for the scour hole so developed. The experimental study revealed that the average scouring got reduced by upto 15% for the circular shaped pier, 22% for the octagonal shaped pier and 21% for the square shaped pier by inclining the pier towards the downstream direction. Thus we can conclude that the maximum reduction in scour depth occurs in octagonal shaped pier.