Bridge Service Life Estimation Considering Inspection Reliability

다국어 초록 (Multilingual Abstract)

Bridges begin to deteriorate as soon as they are put into service. Effective bridge management requires sound understanding of the deterioration mechanism as well as the expected service life. Decision makers design and execute programs that safely maintain or extend bridge service life at low cost. Key maintenance practices include inspections, repairs, and rehabilitation, among which inspections may be the most important since the other maintenance interventions are conducted based on the inspection report. This paper presents a methodology for determining the expected service life of a bridge or a bridge network based on a deterministic condition-based model associated with inspection quality. This study used almost 10-year condition rating results of bridges and developed a non-linear regression model that takes into account the Inspection Reliability Index (IRI). The IRI represents the relative inspection accuracy with respect to a tolerable error of one grade by comparing condition ratings between routine and in-depth safety inspections. In the evaluation of the IRI, significant variability in condition ratings between routine and in-depth safety inspections was observed. Specifically, approximately 42% of routine inspection results deviated within ± 1.0 grade with respect to results from in-depth safety inspections. A modified non-linear regression model combined with the IRI is proposed to predict the remaining service life of a bridge. The proposed model can estimate the service life of a bridge by combining the bridge age and its condition rating.

참고문헌 (Reference)

1 Benjamin A. Graybeal, "Visual inspection of highway bridges" Springer Nature 21 (21): 67-83, 2002

2 Saito, M., "The development of optimal strategies for maintenance, rehabilitation, and replacement of highway bridges: volume 4: cost analysis" Indiana Department of Transportation 1989

3 Brent M. Phares, "Routine Highway Bridge Inspection Condition Documentation Accuracy and Reliability" American Society of Civil Engineers (ASCE) 9 (9): 403-413, 2004

4 Patterson, W. D. O., "Road deterioration and maintenance effects: Models for planning and management" Johns Hopkins University Press 1987

5 Moore, M. E., "Reliability of Visual Inspection of Highway Bridges" Federal Highway Administration, U.S. Department of Transportation. 2001

6 Morcous, G., "Probabilistic and mechanistic deterioration models for bridge management" 364-373, 2007

7 G. Morcous, "Performance Prediction of Bridge Deck Systems Using Markov Chains" American Society of Civil Engineers (ASCE) 20 (20): 146-155, 2006

8 FHWA, "National bridge inspection standard"

9 AASHTO, "Manual for bridge element inspection"

10 Klatter, H., "Life-cycle cost approach to bridge management in the Netherlands" 179-188, 2003

11 Lounis, Z., "Integrating mechanistic and statistical deterioration models for effective bridge management" 513-520, 2002

12 MOLIT, "Guideline of Safety Inspection and In-depth Safety Inspection for Structures"

13 MOLIT, "Guideline and Commentary of Safety Inspection and In-depth Safety Inspection for Structures-Bridge"

14 Rodriguez, M., "Factors affecting bridge deck deterioration in Indiana" 2005

15 Thompson, P. D., "Estimating life expectancies of highway assets, volume 2: Final report, NCHRP Report 713" Federal Highway Administration, U.S. Department of Transportation 2012

16 Thompson, P. D., "Estimating life expectancies of highway assets, volume 1: Guidebook, NCHRP Report 713" Federal Highway Administration, U.S. Department of Transportation 2012

17 Cho, D., "Development and Application of Bridge Management System" Korea Expressway Corporation 1999

18 A. K. Agrawal, "Deterioration Rates of Typical Bridge Elements in New York" American Society of Civil Engineers (ASCE) 15 (15): 419-429, 2010

19 Guido Roelfstra, "Condition Evolution in Bridge Management Systems and Corrosion-Induced Deterioration" American Society of Civil Engineers (ASCE) 9 (9): 268-277, 2004

20 Estes, A. C., "Bridge lifetime system reliability under multiple limit states" 6 (6): 523-528, 2001

21 FHWA, "Bridge inspector's reference manual"

22 Sanders, D. H., "Bridge detrioration models for states with small bridge inventories" 1442 : 101-109, 1994

23 Rene B. Testa, "Bridge Maintenance Level Assessment" Wiley-Blackwell 17 (17): 358-367, 2002

24 Hawk, H., "BRIDGIT: User-friendly approach to bridge management" 498 (498): 1999

25 Adams, T. M., "Assessment and rehabilitation strategies/guidelines to maximize the service life of concrete structures" Wisconsin DOT 2002

26 J. Chang, "A conceptual model of bridge service life" Test accounts 2 (2): 107-116, 2006