A Reliability Model for Bridge Abutment Scour

Deterministic scour prediction equations for bridge abutments consider only the effects of hydraulic parameters and do not take the uncertainties of scouring parameters into account. Treatment of these uncertainties would provide the means for risk evaluation in bridge foundation design. Herein, a static reliability model is developed for the assessment of local scouring reliability around bridge abutments having relatively short lengths. This model is based on resistance-loading interference incorporating dependent parameters. In the model, the relative abutment footing depth, which can be considered at least the relative maximum scour depth, and the linear combination of the relative approach flow depth and Froude number are defined as the system resistance and external loading, respectively. By examining the statistical randomness of extensive laboratory data, a bivariate lognormal distribution is found to represent the joint probability density function of dependent resistance and loading. Reliability expressions are developed in terms of resistance. In an example, it is shown that the results of the proposed model and a Monte Carlo simulation are in good agreement. It is also observed that the execution of this model is less time consuming than the Monte Carlo simulation.
Turkish Journal of Engineering and Environmental Sciences


Probabilistic Assessment of Overtopping Reliability of a Dam
Yanmaz, Ali Melih (2006-05-23)
Probabilistic methods, which consider resistance and load parameters as random variables, are more realistic than conventional deterministic methods for determining the safety level of a dam. This study is based on a probabilistic assessment of overtopping reliability of a flood detention dam. In the analysis, the inflow hydrograph parameters and the initial reservoir level prior to the allocation of the flood in the reservoir are accepted as random variables. A bivariate flood frequency analysis is perform...
Yücemen, Mehmet Semih (Elsevier BV, 1993-10-01)
A stochastic framework is developed, in terms of the theory of homogeneous random functions, to estimate the seismic hazard associated with linearly extending seismic sources. The formulation is carried out in the space-time domain. An earthquake having at least a magnitude of m is assumed to occur whenever the total strain energy accumulated over the potential rupture plane exceeds the energy level corresponding to this magnitude, m. An alternative formulation, in which an earthquake is generated when the ...
Reliability-based analysis of time-dependent scouring at bridge abutments
Kerpiççii Kara , Sibel; Yanmaz, Ali Melih; Department of Civil Engineering (2009)
Deterministic scour prediction equations for bridge abutments do not involve uncertainties coming from scouring parameters and they only consider effects of hydraulic parameters. However, in order to safely design bridge abutments, treatment of these uncertainties and evaluation of possible risks are required. Two artificial neural network (ANN) models are constructed to describe scouring phenomenon using the parameters of two different equations. The equation to be used in the reliability analysis is then ...
Koleva, G.; Sandu, I.; Akkar, S. (2008-05-20)
In displacement-based engineering, the maximum interstory drift ratio (MIDR) is one of the most influential parameters for evaluating the seismic performance of existing structural systems. MIDR is also a key parameter in force-based designs satisfying serviceability lit-nits for new structural systems. A set of predictive equations is derived for estimating MIDR on shear-wall systems with fundamental periods ranging from 0.5 to 1.25 s. The equations are derived from a recently compiled ground-motion datase...
A density functional theory study on the structural and electronic properties of PbxSbySez (x plus y plus z=2, 3) clusters
Pekoz, Rengin; Erkoç, Şakir (2018-01-30)
The structural and electronic properties of neutral ternary PbxSbySez clusters (x y + z = 2, 3) in their ground states have been explored by means of density functional theory calculations. The geometric structures and binding energies are systematically explored and for the most stable configurations of each cluster type vibrational frequencies, charges on atoms, energy difference between highest occupied and lowest unoccupied molecular orbitals, and the possible dissociations channels have been analyzed. ...
Citation Formats
A. M. Yanmaz, “A Reliability Model for Bridge Abutment Scour,” Turkish Journal of Engineering and Environmental Sciences, pp. 67–83, 2004, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/79692.