A Study on seismic behavior of scour-vulnerable bridges

Kızılduman, Hale Sema
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 not normally analyzed. This study aims to evaluate differences of structural behavior proportionally in scoured and not scoured bridges. In this context, a two-span reinforced concrete bridge is selected for this study. For six different flood conditions, water surface profiles are obtained via hydraulic analysis and response spectrum analyses are made for earthquakes with four different return periods. There are two ground structure scenarios studied in analyses; two layers with sand and clay and one layer of sand. The results have shown that the moments vi on columns and the fundamental periods of the structure are decreased. As a result, an increase in column capacity is observed to be dependent on the scour depth. On the other side, it is seen that pile capacities decrease and shear force and moments on piles increase due to scour. The stability of the bridge becomes more questionable as the pile load carrying capacity decreases due to loss of skin friction.


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Kayatürk, Şerife Yurdagül; Göğüş, Mustafa; Department of Civil Engineering (2005)
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 ...
A Case Study on Bridge-Scour Risk Assessment
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Many bridges fail or subject to considerable stability problems because of excessive scouring at infrastructural elements, such as piers and abutments. Computation of maximum possible depth of scour at these elements would lead to safe and economical design of footings. Scour depth computation is also of importance for existing bridges to assess their vulnerability against this phenomenon throughout their remaining life spans. A ...
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Yanmaz, Ali Melih (2012-04-26)
Serious scouring may take place around bridge abutments during floods, which can lead to considerable damage or structural collapse. Design of abutment footings must, therefore, rely on the estimation of maximum possible depth of scour through the bridge opening. Deterministic scour-prediction equations are based on simplified assumptions and they do not account for randomness of the scouring variables, which leads to an unavoidable risk in footing design. This study is concerned with the development of a n...
Development of a safetyinspection methodology for river bridges
Berk, Aysu; Yanmaz, Ali Melih; Department of Civil Engineering (2006)
River bridges get damaged or even collapse because of various reasons, such as development of adverse hydraulic conditions during severe floods, disastrous earthquakes, deficiencies in structural and geotechnical design, material deficiencies, or other unexpected external factors. Failure of service at vital lifelines, bridges, can lead to loss of several lives and properties, traffic disruption, and/or deficiencies in daily usage. Existing structures should be monitored periodically for decision-making and...
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While methodologies exist which allow to rapidly identify the seismically deficient bridges and rank them in terms of their respective vulnerability, it remains that the bridge vulnerability aspect of these methodologies is crude and generally limited to simple recognition of undesirable structural features known to have performed inadequately in past earthquakes. Thus, bridges sharing such features would also share the same rating, independently of variations in geometry and other structural properties. As...
Citation Formats
H. S. Kızılduman, “A Study on seismic behavior of scour-vulnerable bridges,” M.S. - Master of Science, Middle East Technical University, 2016.