A Case Study on Bridge-Scour Risk Assessment

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 software, named as HYRISK, developed by the United States Federal Highway Administration (FHWA) can be utilized to assess the existing risk with reference to scouring action. HYRISK is a risk-based model, which computes the risk of failure of a bridge. It may also be applied to sequential bridges located on a river concerned. Therefore, it may eventually be possible to rank the series of existing bridges according to degree of potential risk imposed on the structures and the close environment. It can also provide a mean to compare possible bridge scour countermeasures that may be compatible to the local site characteristics of the bridge under consideration. A risk-based case study is carried out for a bridge located in Vakfıkebir, a town of Trabzon, Turkey, to illustrate the application of HYRISK model.


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 ...
Generalized reliability model for local scour around bridge piers of various shapes
Yanmaz, Ali Melih (2001-10-01)
Excessive local scour around piers and abutments is known as a major cause of bridge failure induced by hydraulic deficiencies. Complexity of the scouring phenomenon and high degrees of uncertainties in governing parameters lead to an unavoidable risk in bridge pier design. In this paper, a generalized reliability model based on static resistance-loading interference is developed for the assessment of reliability of bridge scour for various pier shapes. In the model, the relative maximum scour depth and the...
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...
A study on risk assessment of scour vulnerable bridges
Apaydın, Meriç; Yanmaz, Ali Melih; Department of Civil Engineering (2010)
Many river bridges fail or are seriously damaged due to excessive local scouring around piers and abutments. To protect a bridge from scour-induced failure, it should be designed properly against excessive scouring and its scour criticality should be checked regularly throughout the service life to take prompt action. The Federal Highway Administration of United States (FHWA) developed a program, HYRISK, as a basis for evaluation of existing scour failure risk of a bridge. It provides implementation of a ri...
Evaluation of Scour Risk at Foundations of River Bridges
Yanmaz, Ali Melih; Çalamak, Melih (2016-07-01)
River bridges are exposed to more inconvenient conditions due to the structure-flow interaction compared to bridges having no contact with flow. Therefore, one of the most important components of the bridge failure risk is the risk induced by soil-flow interaction. In this study, the uncertainties of the hydrological and hydraulic parameters affecting the scouring around bridge piers are examined using appropriate probability density functions. In the analyses, the uncertainties involved in the temporal var...
Citation Formats
A. M. Yanmaz, “A Case Study on Bridge-Scour Risk Assessment,” 2010, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88440.