Scour and scour protection at bridge abutments

Kayatürk, Şerife Yurdagül
Bridge failures are mainly caused by scouring the bed material around bridge foundations during flood. In this study, scour phenomenon around bridge abutments is experimentally studied. Effect of abutment size, location and size of the collars placed around the abutments, time evaluation of scour hole around the abutment, scour characteristics of abutment and pier interaction were experimentally investigated. Scour measurements were conducted in a rectangular channel of 30 m long and 1.5 m wide filled with erodable uniform sediment. In the first part of the study, in order to investigate the size effect of the abutment on the maximum scour depth, abutments of nine different sizes were tested for three different water depths. It was found that the length of the abutment is more important parameter than the width of it. Secondly, efficiency of various sizes of collars, which are used to reduce the local scour depth, located at different elevations around the abutments was determined. It was noticed that when the collar width was increased and placed at or below the bed level, the reduction in scour depth increases considerably. Some tests for partial-collar arrangements around the abutments were conducted and it was shown that instead of full-collar one can use partial-collar arrangements around the abutments to achieve the same efficiency as the full-collar. Time development of scour holes around the abutments with and without collar cases were recorded. It was observed considerable reductions in scour depths around the abutments can be obtained with collars compared to the cases in which there are no collars over the same time period. Finally, a series of experiments were carried out to investigate the interaction between bridge abutments and piers related to the local scour around them. Based on the experiments conducted with two different abutment lengths and pier


Local scour characteristics around semi-circular end bridge abutments with and without collars
Tekin, Fatime; Köken, Mete; Department of Civil Engineering (2012)
The major damage to bridges occurs due to scour of the bed materials around piers and abutments during severe floods. This study involves the experimental investigations of the various scour patterns forming around abutment models tested with and without collars as scour countermeasures. The experiments were conducted in a rectangular channel under clear-water scour conditions. In the first part of this study, 34 experiments were conducted with semi-circular end abutment models with and without a collar for...
Experimental investigation of local scour around bridge pier groups
Özalp, Murat Can; Bozkuş, Zafer; Department of Civil Engineering (2013)
It is an important task that design engineers in practice predict the local scour around bridge piers as accurately as possible because excessive local scour around bridge piers unbalance and demolish the bridges. Many equations have been proposed previously by various researchers, based on their experimental findings, but no general method has been developed so far due to the complexity of the topic. In the present study two new bridge pier groups were employed to investigate the inclination effect of the ...
A Study on seismic behavior of scour-vulnerable bridges
Kızılduman, Hale Sema; Yanmaz, Ali Melih; Caner, Alp; Department of Civil Engineering (2016)
Scour under bridge foundations typically causes serious defects or failures. The studies on seismic behavior of bridges scoured prior to earthquake are very limited. Although earthquakes are not one of the top reasons for bridge failures or damages, when the effects of earthquakes and scour are combined, the structure can become highly vulnerable to failure. In Turkey, during the design process of bridges, the earthquake effects are seriously considered, but the combined effect of scour and earthquake is no...
Effects of collars on local scour around semi-circularend bridge abutments
Daşkın, Süeyla; Göğüş, Mustafa; Department of Civil Engineering (2011)
During severe floods, bed material around bridge piers and abutments are scoured by the flow and as a result, bridges are subject to damages. These damages are mostly unrepairable and can result in loss of lives and property. In this thesis study, abutment scour under clear-water condition was investigated and collars were tested as scour countermeasures around the abutments. The experimental study was carried out in a rectangular channel with an almost uniform cohesionless bed material of d50=1.50 mm for a...
Experimental and numerical investigation of the wind effects on long span bridge decks
Iman, Ashtiani Abdi; Uzol, Oğuz; Kurç, Özgür; Department of Aerospace Engineering (2011)
Long span bridges are susceptible to wind. Hence it is important to study their wind-induced vibrations to avoid any probable structural failures. In this thesis, the results of an experimental and computational investigation of the aerodynamic characteristics of trapezoid bridge deck cross-sections with three different aspect ratios (10, 12 and 15) and four different side angles (75º, 60 º, 45 º and 30 º) are analyzed and presented. The flow around rigid fixed bridge deck models is investigated to obtain t...
Citation Formats
Ş. Y. Kayatürk, “Scour and scour protection at bridge abutments,” Ph.D. - Doctoral Program, Middle East Technical University, 2005.