Time-function reliability of harbour infrastructures from stochastic modelling of corrosion

This article summarises research led during the second phase of the French GEROM (risk management of maritime and river harbour structures) project in order to quantify the risks associated with vulnerable structures. A reliability analysis is applied here to steel sheet-pile seawalls. For this purpose, a stochastic (spatial-temporal) model of steel corrosion is proposed, based on a statistical analysis of data collected from wharves located in several French ports and of various ages. The predictions obtained from the corrosion model are then integrated into a reliability analysis to carry out a time-function reliability analysis of corroded harbour structures. The results are then compared and analysed both in terms of reliability and sensitivity to basic random variables. This approach allows suggesting preliminary requirements about maintenance optimisation.

[1]  Franck Schoefs,et al.  Effect of Corrosion on Time-Dependent Reliability of Steel Sheet-Pile Seawalls in Marine Environment Conditions , 2010 .

[2]  Franck Schoefs,et al.  The αδ method for modelling expert judgement and combination of non-destructive testing tools in risk-based inspection context: application to marine structures , 2012 .

[3]  Franck Schoefs,et al.  Technical management of French harbour structures Part 2: Current practices, needs - Experience feedback of owners , 2009 .

[4]  Alain Sellier,et al.  Méthode du gradient projeté avec contrôle d’erreur , 2008 .

[5]  R. Ghanem,et al.  Stochastic Finite Elements: A Spectral Approach , 1990 .

[6]  Jean-Armand Calgaro.  Introduction aux Eurocodes , 1996 .

[7]  Jean-Bernard Memet,et al.  La corrosion marine des structures métalliques portuaires : étude des mécanismes d'amorçage et de croissance des produits de corrosion , 2000 .

[8]  Franck Schoefs,et al.  Technical management of French harbour structures Part 1: Description of built assets , 2009 .

[9]  R. Melchers.  Corrosion uncertainty modelling for steel structures , 1999 .

[10]  Robert E. Melchers,et al.  Models for the anaerobic phases of marine immersion corrosion , 2006 .

[11]  R. Rackwitz,et al.  Structural reliability under combined random load sequences , 1978 .

[12]  Christian Soize,et al.  Non-Gaussian simulation using Hermite polynomial expansion: convergences and algorithms , 2002 .

[13]  Franck Schoefs,et al.  Statistical analysis of corrosion process along French coasts , 2010 .

[14]  Jean-Bernard Kovarik,et al.  Recommandations pour le calcul aux états-limites des ouvrages en site aquatique , 2003 .

[15]  N. Metropolis,et al.  The Monte Carlo method. , 1949 .

[16]  Frank Lunkeit,et al.  Reference Manual Version 16 , 2011 .