A framework for probabilistic assessment of clear-water scour around bridge piers

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Title: A framework for probabilistic assessment of clear-water scour around bridge piers
Authors: Tubaldi, E
Macorini, L
Izzuddin, B
Manes, C
Laio, F
Item Type: Journal Article
Abstract: Scouring at the base of bridge piers is the major cause of bridge collapses worldwide. Computing the scour risk of bridge foundations is therefore key for a correct management and allocation of resources for maintenance and scour mitigation works. Existing risk-assessment models compute the vulnerability of bridge foundations to scour by comparing the equilibrium scour depth associated with peak-flow discharges characterized by a given return period (usually of 100–200 years) with the critical foundation depth of the bridge. This approach neglects completely the history-dependent and time-dependent nature of scour. Yet, it is well known that bridge collapses can often be induced by the accumulation of scour during multiple flood events. This study aims at developing a novel probabilistic framework for the computation of bridge-pier vulnerability to scour using a Markovian approach to account for memory effects in scour development. The paper focuses on the case of local pier scour occurring in clear-water conditions whereby cumulative effects are significant, well understood and known to be the cause of recent reported bridge collapses. A simplified numerical example consisting of an idealised bridge pier in a canal is considered to clarify the application of the proposed framework and to shed light on the effects of some assumptions introduced to simplify the probabilistic scour assessment.
Issue Date: 3-Aug-2017
Date of Acceptance: 4-Jul-2017
URI: http://hdl.handle.net/10044/1/49912
DOI: https://dx.doi.org/10.1016/j.strusafe.2017.07.001
ISSN: 0167-4730
Publisher: Elsevier
Start Page: 11
End Page: 22
Journal / Book Title: Structural Safety
Volume: 69
Copyright Statement: © 2017 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: 657007
Keywords: 0905 Civil Engineering
Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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