Condition Assessment for Bridge Management

Aktan, A. Emin; Farhey, Daniel N.; Brown, David L.; Dalal, V.; Helmicki, Arthur J.; Hunt, Victor J.; Shelley, S. J.

doi:10.1061/(asce)1076-0342(1996)2:3(108)

Cited by 102 publications

(40 citation statements)

References 10 publications

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“…Thereby, rehabilitation work is always preceded by inspection at cost I(α j ), which is a function of the parameter α j of inspection quality. That is, a more detailed inspection, utilizing maybe different condition assessment procedures 45), 51) , is more costly than a routine visual inspection. Since inspection or condition assessment makes only sense as long as the structure has not failed, the cost for inspection I(α j ) has to multiplied by the probability of no fail-…”

Section: (3) Expected Lossesmentioning

confidence: 99%

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Cost-Benefit Based Optimization of Maintenance Interventions for Deteriorating Structures

Higuchi

Macke

2007

Structural Eng./Earthquake Eng.

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In most more economically developed countries an ever growing percentage of existing structures is threatened by obsolescence in the short-to medium-term-either because of structural deficits due to deterioration, or due to functional aging. To ensure sustained serviceability and safety of these structures, maintenance interventions are utilized, which allow partial or complete structural rehabilitation. However, such maintenance interventions have to be economically reasonable, that is, maintenance expenditures spent have to be outweighed by expected future benefits. For this purpose, we propose herein a novel optimization formulation for maintenance planning based on cost-benefit criteria. The usefulness of the proposed approach lies in the fact, that it not only allows to determine optimal sequences of maintenance times, rehabilitation levels and inspection qualities, but also allows to specify economically optimal lifetimes and acceptable failure rates of structures. The modeling of structural deterioration and maintenance, as well as the setting of all relevant cost factors is discussed in detail. Numerical examples investigate the effect of imperfect execution of maintenance actions and functional aging.

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Section: (3) Expected Lossesmentioning

confidence: 99%

“…For an already deteriorated structure, we would certainly have a different start vector, which could be determined with the help of some condition assessment procedure 45) .…”

Section: Numerical Examples (1) Transition Matrixmentioning

confidence: 99%

Cost-Benefit Based Optimization of Maintenance Interventions for Deteriorating Structures

Higuchi

Macke

2007

Structural Eng./Earthquake Eng.

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“…The condition of the bridges is typically rated by this idealised system, however the bridge condition score system is inadequate to provide a sound study of the bridge element deterioration process [14] . Most of the developed bridge models used by management authorities manage bridge assets based on these subjective condition indices and make maintenance decisions without considering the effects of maintenance on these scores.…”

Section: Introductionmentioning

confidence: 99%

Modelling Railway Bridge Degradation Based on Historical Maintenance Data

Andrews

2015

Safety and Reliability

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As structure deteriorates with age and use, it is necessary to devise a maintenance plan to control their states in a cost effective way. In order to evaluate the effectiveness of alternative maintenance strategies their success must be measured by their ability to control the structure condition. The condition can be expressed for either the entire structure or for the components which make up the structure. A problem is how to express this condition. This is a particular problem for bridges where there can be several deterioration mechanisms taking place and there is no clear way of measuring the current state of either the structure of its elements. One approach to defining the condition of bridges is to use condition scores or condition indices, for the infrastructure owners, it is it is desirable that they understand how their population of assets is changing over time. For bridges this has involved providing a condition rating for each structure based on observation and by tracking the changes in the distribution of structure condition for population over time. The current maintenance strategy can then be shown to be inadequate (leading to deteriorating population condition), adequate (producing a stable population condition) or effective and resulting in an improving population condition.There have been a variety of bridge condition scoring systems that have been devised by different infrastructure owners in both the highway and railway sectors. Whilst these scores are not devised to be used in detailed maintenance modelling, due to the lack of alternative data they have frequently been used in this manner. This paper addresses the problems of using this data for bridge degradation modelling and proposes an alternative method to model the degradation of bridge elements using historical work done data. The deterioration process is modelled by a Weibull distribution that governs the time a component deteriorates to a degraded condition state following a repair. The method is demonstrated on real historical maintenance data where the analyses of the deterioration processes of several bridge main bridge components are presented.

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“…Many existing bridges have been deemed structurally deficient (Aktan et al 1996), but despite the extent of the problem, condition assessment of bridges is still largely based on visual observations and described by subjective indices which do not permit accurate evaluation of serviceability and safety. Subjective or inaccurate condition assessment has been identified as the most critical technical barrier to the effective management of highway bridges.…”

Section: Introductionmentioning

confidence: 99%

“…A significant research effort has focussed on the condition assessment of existing bridges, and relevant research has accelerated in recent years (Aktan et al 1996(Aktan et al ,1997(Aktan et al ,1998Enright and Frangopol 1999;Wahab and Roeck 1999). However, most investigations were based on field testing and numerical analysis without attempts to quantify structural condition.…”

Section: Introductionmentioning

confidence: 99%

Bridge Structural Condition Assessment Using Systematically Validated Finite-Element Model

Xia

2004

J. Bridge Eng.

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Structural condition assessment of highway bridges is largely based on visual observations described by subjective indices, and it is necessary to develop methodology for accurate and reliable condition assessment of aging and damaged structures. This paper presents a method using a systematically validated finite element model for quantitative condition assessment of a damaged reinforced concrete bridge deck structure, including damage location and extent, residual stiffness evaluation and loadcarrying capacity assessment. In a trial of the method in a cracked bridge beam, the residual stiffness distribution was determined by model updating thereby locating the damage in the structure. Furthermore the damage extent was identified through a defined damage index and the residual load-carrying capacity was estimated.

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Condition Assessment for Bridge Management

Cited by 102 publications

References 10 publications

Cost-Benefit Based Optimization of Maintenance Interventions for Deteriorating Structures

Cost-Benefit Based Optimization of Maintenance Interventions for Deteriorating Structures

Modelling Railway Bridge Degradation Based on Historical Maintenance Data

Bridge Structural Condition Assessment Using Systematically Validated Finite-Element Model

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