Evaluation of Scour Risk at Foundations of River Bridges

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 variation of clear water scouring mechanism are considered. Influences of general bed degradation of the main channel and the contraction scour are ignored. The risk associated with the scouring around piers is estimated using Monte Carlo simulations. In the model, the scouring risk of the bridge pier is determined for the given flow, pier geometry and bed material characteristics. The developed model is presented with an application.


Composite reliability model for local scour around cylindrical bridge piers
Yanmaz, Ali Melih (2001-06-01)
Bridge scour is an extremely complex phenomenon because of the random characteristics of sediment laden flow in close proximity to piers and abutments. This occurrence leads to high uncertainties and unavoidable risk in bridge pier and abutment design. In this study, a composite reliability model is developed for the reliability assessment of bridge pier scour using static resistance - loading interference. Based on the physical interpretation of the phenomenon and a statistical analysis of the available in...
Dynamic Reliability in Bridge Pier Scouring
Yanmaz, Ali Melih (2002-09-01)
Many bridges crossing wide rivers fail due to excessive local scour around piers and abutments during heavy floods. Because of the random nature and complexity of the overall scouring phenomenon through the bridge opening, there exist uncertainties leading to an unavoidable risk in bridge foundation design. A reliability-based assessment of bridge pier scour is required to examine the relationship between safety factors and reliability, which are key parameters for decision making in design. Herein, a dynam...
A Case Study on Bridge-Scour Risk Assessment
Yanmaz, Ali Melih (2010-09-27)
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 ...
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 Quantitative Approach for Rapid Seismic Vulnerability Assessment of Steel Highway Bridges
Dicleli, Murat (1997-01-01)
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
A. M. Yanmaz and M. Çalamak, “Evaluation of Scour Risk at Foundations of River Bridges,” TEKNIK DERGI, pp. 7533–7549, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53615.