Analisis Susunan Tirai Optimal Sebagai Proteksi Pada Pilar Jembatan Dari Gerusan Lokal

Abstract

Local scour frequently occurs in the downstream of energy muffler or around the bridge pillars. The bridge pillar function decreases due to the scour of soil material around it. After the scour, the river base degrades resulting in position changes of pile cap, which initially under river base elevation, rises to above the river base elevation. This research conducted using experimental method in Hydraulic Laboratory of UNS's Engineering Faculty. A cylinder and round tip rectangular pillars used as the samples on the sediment Transport Demonstration Channel tool, to find out the characteristic of local scour occurred around the pillar. The analysis shows that the use of curtain to reduce local scour around the pillar is very effective. The reduction value indicated by the test is in a range of 23.12% - 38.53%.. The local scour depth of cylinder pillar after equilibrium condition achieved is in an array of 2.0 – 2.9(y/b) with an average of 2.45(y/b), while the value achieved by round tip rectangular pillar after equilibrium condition is 2.3 – 2.9(y/b) with an average of 2.6(y/b