Dynamic Reliability in Bridge Pier Scouring

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 dynamic reliability model based on resistance-loading methodology with random independent loading following a Poisson process and random fixed resistance is applied to assess the reliability of local scouring around single cylindrical piers under various combinations of decision variables. Variation of reliability with respect to safety factor, service life, return period and pier size is examined in an integrated manner in a practical application. The results of dynamic reliability are also compared with the findings of the static reliability model.
Turkish Journal of Engineering and Environmental Sciences


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...
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...
Uncertainty of local scouring parameters around bridge piers
Yanmaz, Ali Melih (2001-03-01)
Reliability-based assessment of local scouring mechanism around bridge piers provides information for decision-making regarding the pier footing design. Parameter uncertainties that may arise from various sources due to the inability to precisely quantify a parameter need to be estimated in order to quantify the level of risk of pier failure during the physical life of a bridge. By examining extensive experimental data from the literature on local scour depth around various shapes of bridge pier the functio...
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...
Hydrological aspects of bridge design: Case study
Yanmaz, Ali Melih (1995-01-01)
Many bridges are destroyed or fail completely during severe floods. If the cause of the damage is not a structural deficiency, it may be excessive local scour around bridge piers and/or abutments. Although the mechanics of the local scour around these obstacles has been studied extensively, the studies investigating the hydrologic design aspects are limited in the literature. Insufficient hydrologic and hydraulic evaluations may result in uncertainties in bridge design. The optimum return period for a flood...
Citation Formats
A. M. Yanmaz, “Dynamic Reliability in Bridge Pier Scouring,” Turkish Journal of Engineering and Environmental Sciences, pp. 367–375, 2002, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/84066.