EXPERIMENTAL STUDY ON EFFECT OF SLOT LEVEL ON LOCAL SCOUR AROUND BRIDGE PIER

Abstract

Many bridges in the world every year for Failure to consider in the design of hydraulic elements are destroyed. During the spring floods of 1987, 17 bridges in New York and New England were damaged or destroyed by scour. In 1985, 73 bridges were destroyed by floods in Pennsylvania, Virginia, and West Virginia. In the present study investigate effect application a slot , height “D” , width” D/4”in a circular pier ,where “D” is diameter of bridge pier and the size of 6 centimeters under 3 different discharges (values 35 , 40 , 45 Liter per second) and 4 different location of slot in a flume ,length 14 meters ,height 60 and width 60 centimeters. The experimental results show when height of slot is below the stream bed as D, scour depth will be reduced about 20.34% to 39.73% in front of the pier and scour volume approximately 46.84% to 75.74%