FSchoefs-WG2 [Modo de Compatibilidade]durati.lnec.pt/pdf/workshop/DURATINET Workshop/FS... ·...
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Investing in our common future 7th Trans-national Workshop Lisboa LNEC 30 th May 2012 Project nr 2008-1/049 Project nr 2008-1/049 Franck Schoefs, LUNAM Université, U. of Nantes, France and all the partners of WG2 (TCD, U. Bordeaux, EP) duratiNet 7th Trans-national Workshop Lisboa LNEC 30 th May 2012 Investing in our common future Problem Definition For a given structure how do we decide upon the optimal maintenance strategy as a function of age, condition, importance, required remaining life etc. in a robust/repeatable manner, avoiding generalisation/excessive conservatism such that our maintenance budget is optimised??? e.g. Storstroem 1937, 3.2km 7th TRANS-NATIONAL DURATINET Workshop LNEC • Lisbon • Portugal • 30 May 2012
Transcript of FSchoefs-WG2 [Modo de Compatibilidade]durati.lnec.pt/pdf/workshop/DURATINET Workshop/FS... ·...
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7th Trans-national WorkshopLisboa LNEC 30th May 2012
Project nr 2008-1/049Project nr 2008-1/049
Franck Schoefs, LUNAM Université, U. of Nantes, France and all the partners of WG2 (TCD, U. Bordeaux, EP)
duratiNet 7th Trans-national WorkshopLisboa LNEC 30th May 2012
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Problem Definition
For a given structure how do we decide upon the optimal maintenance strategy as a function of age, condition, importance, required remaining life etc. in a robust/repeatable manner, avoiding generalisation/excessive conservatism such that our maintenance budget is optimised???
e.g. Storstroem 1937, 3.2km
7th TRANS-NATIONAL DURATINET Workshop LNEC • Lisbon • Portugal • 30 May 2012
Durati
Net
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Load Rating @ t
Problem Definition
Extensive repair
Cathodic Protection
Do Nothing
Load Rating @ t
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A Complex Problem
7th TRANS-NATIONAL DURATINET Workshop LNEC • Lisbon • Portugal • 30 May 2012
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Hierarchical Methodology
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Adaptation to the practice
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Statistical Modelling of:LoadsResistancesUncertainties Updating based upon results of tests/inspections
Purpose:Cut strengthening or rehabilitation costs without compromising the safety level
Essentially a Bridge specific “code” is obtained
Some technical aspects
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Legal Basis – Eurocode 1 Basis of Design
Safety Level NEVER Compromised – Rather Optimised
Probability Based Maintenance Optimisation
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Few Examples
from
Portugal,
Ireland,
France
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Ferrycarrig Bridge, IrelandAlternative Repair Options
Crossshead 1,7: Cem 1 OPC, 50mm coverCrosshead 2: Cem 1 OPC, 70mm coverCrosshead 3: Cem 1 OPC, silanesurface treatmentCrosshead 4,6: Cem 1 OPC, 60% GGBSCrosshead 5: Cem 1 OPC, mixed in corrosion inhibitors
Probabilistic Assessment
Torsional Capacity of Crosshead Beams
•Failed in Deterministic Assessment
•Passed in Probabilistic Assessment
7th TRANS-NATIONAL DURATINET Workshop LNEC • Lisbon • Portugal • 30 May 2012
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Barra Bridge, Portugal
Resistance capacity before repair
(kN.m)
Resistance capacity after
repair(kN.m)
Pier 8 -319730 -364150
Mid-Span
20 460 22100
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Steel Wharf, France
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Economic Implications
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Thank you for your attention
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