SLAB-D: service life analysis of bridge decks - decision support tool for life cycle management of bridge decks

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n’arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

Questions? Contact the NRC Publications Archive team at

PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information.

https://publications-cnrc.canada.ca/fra/droits

L’accès à ce site Web et l’utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D’UTILISER CE SITE WEB.

READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.

https://nrc-publications.canada.ca/eng/copyright

NRC Publications Archive Record / Notice des Archives des publications du CNRC :

https://nrc-publications.canada.ca/eng/view/object/?id=535f73ec-4a67-4e79-8de1-b455591163eb https://publications-cnrc.canada.ca/fra/voir/objet/?id=535f73ec-4a67-4e79-8de1-b455591163eb

NRC Publications Archive

Archives des publications du CNRC

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at

SLAB-D: service life analysis of bridge decks - decision support tool for life cycle management of bridge decks

http://irc.nrc-cnrc.gc.ca S L A B - D S e r v i c e l i f e a n a l y s i s o f b r i d g e d e c k s – d e c i s i o n s u p p o r t t o o l f o r l i f e c y c l e m a n a g e m e n t o f b r i d g e d e c k s , v e r s i o n 1 . 0 2 0 0 6 I R C - O R A L - 8 4 9 D a i g l e , L . ; L o u n i s , Z . F e b r u a r y 1 3 , 2 0 0 8

The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42

Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42

Decision Support Tool for Life Cycle Management of Bridge Decks

• Buried Utilities

• Concrete Structures

• Centre for Sustainable Infrastructure Research (CSIR) in Regina Construction codes and guides Urban Infrastructures Building Envelope and Structure

Indoor Environment Fire

Research

Introduction

Institute for Research in

Concrete Structures – Research Thrusts

rehabilitated concrete structures

Introduction

• Development of innovative high performance concrete

infrastructure systems

• Development of decision

support tools for life cycle management of concrete structures

Life cycle of a Bridge

Introduction

Design Construction Use Deterioration

Inspection Maintenance Rehabilitation Replacement Demolition/ Failure Deterioration Disposal Deterioration

Bridge facts

– in Canada 45% of our 80 000 bridges are older than 40 years

– bridges deteriorate with time – more than 50% of bridges are

structurally/functionally deficient – investment backlog ≈ $10 billion

– typically owners have thousands of bridges/structures

• Causes of deterioration & failure

– increased truck load & volume of traffic – inadequate design, construction and

maintenance

– aggressive environment/corrosion

Introduction

• Consequences of deterioration/failure

– reduced safety, serviceability and service life – increased risk of fatalities/injuries

– increased maintenance and user costs – increased environmental impact

Example of a severely damaged RC bridge deck slab due to corrosion

– identify critical bridges/components

– identify optimal maintenance strategies – optimize the design of new bridges

– extend service life of bridges

– determine required funding over life cycle – minimize life cycle costs

Life Cycle Management

of Bridges

SLP

Service Life Prediction

LCCA

Life Cycle Cost Analysis

SLAB-D: Decision Support tool for Service Life

Analysis of Bridge Decks

Life Cycle Management

of Bridges

SLP Module

Based on physical models that describe the three stages of concrete deterioration due to corrosion Concrete contamination by chloride (de-icing salts) TIME Corrosion of reinforcing steel Concrete deterioration (cracking, spalling, delamination)

SLP Module - Models

Chloride contamination

Cl- Model is based on modified

Fick’s 2nd _{law of diffusion}

Chloride content in concrete at (x,t) depends on diffusion coefficient and surface

Corrosion of reinforcing steel

Cl- Corrosion resistance of _{rebar defined by Chloride}

threshold value

Fick’s 2nd _{law of diffusion}

with two set boundaries

Cl- = C_th

SLP Module - Models

Concrete deterioration

ƒ Based on thick-wall cylinder modelling of

concrete cover subjected to internal pressure induced by accumulating corrosion products

ƒ Damage accumulation depends on corrosion

rate, cover, bar spacing/diameter and concrete tensile strength

ƒ Failure modes: Internal cracking, surface

SLP Module

Service Life model in SLAB-D can predict the time it takes to reach anyone of the six limits states:

• Critical chloride contamination of deck

• Onset of corrosion

• Onset of internal cracking

• Onset of surface cracking

• Onset of spalling

SLP Module

SLP Module

•Two types of analyses :

All parameters are entered as average values (or other) → Result is the average time to reach each limit state

SLP Module

•Two types of analyses : Probabilistic

Load R el at ive F re q u e n c y Load Resistance Resistance

Mean Load

<

Probability of Failure

Uncertainty

Environmental exposure

Loading (magnitude, time of occurrence)

Uncertainty

material properties

Norm al C o n c ret e Norm al C o n c ret e

SLP Module

Main Features

ƒ Calculate Present Value Life Cycle Cost (PVLCC) for RC decks: construction, maintenance, repair and

rehabilitation costs of different options

ƒ Includes Users’ Costs in the PVLCC

Life Cycle Cost

Analysis Module

LCCA Module

–

•

Delay Costs

•

Vehicle Operating Costs

•