2014-2015 SPRING TERM
Instructor: Prof.Dr. Melih Yanmaz
Class hours: Tuesdays 9.40-12.30 (WRL)
Catalogue Description: Introduction. Water Surface Profiles at Bridge Sites. Flow Through Bridges. Basic Concepts of Sediment Transport. Vortex Systems Around Bridge Piers. Mechanism of Local Scour Around Bridge Piers and Abutments. Hydrologic and Hydraulic Design Parameters. Hydroeconomic Analysis for Bridges. Scour Countermeasures for Bridge Piers and Abutments.
Yanmaz, A.M. “Köprü Hidroliği”, METU Press, Ankara, 2002.
4. Melville, B.W., ve Coleman, S.E. Bridge Scour, Water Resources Publications, LLC, Colorado, ABD, 2000.
5. Yanmaz, A. M. “Flood Interaction with River Crossings: A Case Study”, Coping with Floods, NATO ASI Series, Series E: Applied Sciences, Vol. 257, 565-569, 1994.
6. Yanmaz, A. M., and Coşkun, F., "Hydrological Aspects of Bridge Design: Case Study", ASCE, Journal of Irrigation and Drainage Engineering, Vol. 121, No: 6, 1-8, October/November, 1995.
7. Yanmaz, A. M., and Altınbilek, H. D., "Study of Time Dependent Local Scour Around Bridge Piers", ASCE, Journal of Hydraulic Engineering, Vol. 117, No.10, 1247 1268, October, 1991.
8. Yanmaz, A. M. “Temporal Variation of Clear Water Scour at Cylindrical Bridge Piers”, Canadian Journal of Civil Engineering, 33(8), 1098-1102, 2006.
9. Yanmaz, A. M., and Çiçekdağ, Ö., “Composite Reliability Model for Local Scour Around Cylindrical Bridge Piers”, Canadian J. Civil Engineering, Vol. 28, No:3, 520 535, June, 2001.
Course Objectives: The course is primarily designed
1. INTRODUCTION (2 hr)
1.1.Scope of bridge hydraulics
2. FLOW THROUGH BRIDGES (16 hrs)
2.1. Governing equations for non-uniform open channel flow
2.2. Classification of water surface profiles
2.3. Subcritical flow conditions at bridge sites
2.4. Supercritical flow conditions at bridge sites
2.5. Choking at bridge sites
2.6. The momentum approach
2.7. The energy approach
2.8. Semi-empirical approaches
2.9. Pressure and weir types of flows at bridge sites
3. BASIC CONCEPTS OF SEDIMENT TRANSPORT (4 hrs)
3.1. Sediment characteristics
3.2. Channel roughness and resistance to flow
3.3. Modes of sediment transport
4. MECHANISM OF LOCAL SCOUR AROUND BRIDGE PIERS/ABUTMENTS (15 hrs)
4.1.Vortex systems around bridge piers
4.1.1.Velocity and pressure distribution around bridge piers
4.1.2.Flow separation around bridge piers
4.1.3.Formation of horse-shoe and wake vortices
4.2. Types of local scour around bridge piers
4.2.1. Clear water scour
4.2.2. Live bed scour
4.3. Dimensional analysis and effects of governing parameters on local scour
4.4. Local scour around abutments
4.5. Comparison of scour prediction models
5. SCOUR COUNTERMEASURES FOR BRIDGE PIERS AND ABUTMENTS (5 hrs.)
5.1. Countermeasures at bridge sites
5.2. Inspection, repair and maintenance of bridges
Conduction of the course:
NOTE: Attendance to lectures is strictly required and will be checked in the class room. Those students having less than 80% attendance or having grades less than 20 (average of two midterm exams) will receive NA grade and will not be permitted to take the final exam.