Modeling Corrosion in Suspension Bridge Main Cables. II: Long-Term Corrosion and Remaining Strength
Publication: Journal of Bridge Engineering
Volume 23, Issue 6
Abstract
Reliably assessing the condition and safety of suspension bridges poses the problem of determining the remaining strength of bridge cables in their present state. Corrosion of the steel wires, which together comprise the main cable, is universally recognized as the main cause of the reduction in strength. Hidden by the protective cable wrapping, this corrosion often goes undetected and unmonitored for years, discovered only during costly and intrusive inspections. This paper presents a method for estimating the remaining capacity of cables that is based on monitored environmental condition data. The long-term corrosion rate of bridge wires, , can be described by the exponential expression where is the annual corrosion rate for a metal free of corrosion products, is the time in years, and is an exponent dependent on the type of metal as well as the prevalent environmental conditions. In this study, a novel approach that relies on tensile test data gathered during a bridge inspection, coupled with environmental condition data typical to the locality of the bridge was used to quantify . Temperature and relative humidity distributions across the cable section required to estimate the corrosion rate were correlated to externally monitored inputs using data from a full-scale mock-up cable subject to cyclic temperature and humidity conditions. Using the developed method, the evolution of cable strength over time under typical environmental conditions was simulated for a 100-year-old cable (Williamsburg Bridge in New York City) as well as a new, hypothetical bridge cable composed of galvanized wires. In the numerical simulation of the Williamsburg Bridge cable, the reduction in cable strength between the years 1988 and 2100 was estimated between 3.2 and 7.0%. Extending this concept, the methodology presented in this paper for estimating the remaining strength of suspension bridge cables may be readily adapted to other bridges and can be used to complement the current best practices for bridge inspection.
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Acknowledgments
This study was sponsored by the Federal Highway Administration under Contract DTFH61-04-C-00040 (program managers Dr. H. Ghasemi and Dr. P. Virmani). The support and guidance of Dr. Ghasemi and Dr. Virmani are greatly appreciated. The continuous suggestions by Dr. Bojidar Yanev, New York City Department of Transportation, are also greatly appreciated.
References
Ames, W. F. (1992). Numerical Methods for partial differential equations, Academic Boston.
ASTM. (2009). “Standard specification for zinc-coated parallel and helical steel wire structural strand.” A586-04a(2009)e1, West Conshohocken, PA.
Barton, S. C., Vermaas, G. W. Duby, P. F. West, A. C. and Betti, R. (2000). “Accelerated corrosion and embrittlement of high-strength bridge wire.” J. Mater. Civ. Eng., 33–38.
Benarie, M., and Lipfert, F. L. (1986). “A general corrosion function in terms of atmospheric pollutant concentrations and rain pH.” Atmos. Environ., 20(10), 1947–1958.
Betti, R., West, A. C., Vermaas, G., and Cao, Y. (2005). “Corrosion and embrittlement in high-strength wires of suspension bridge cables.” J. Bridge Eng., 151–162.
Briggs, C. M. (1968). “Atmospheric corrosion of carbon and low alloy cast steels.” Metal corrosion in the atmosphere, STP435, W. H. Ailor and S. K. Coburn, eds., ASTM, West Conshohocken, PA, 271–284.
Cao, Y., Vermaas, G. W., Betti, R., West, A. C., and Duby, P. F. (2003). “Corrosion and degradation of high-strength steel bridge wire.” Corrosion, 59(6), 547–554.
Chavel, B. W., and Leshko, B. J. (2012). “Primer for the inspection and strength evaluation of suspension bridge cables.” Rep. No. FHWA-IF- 11-045 prepared for the Federal Highway Administration, HDR Engineering, Pittsburgh, PA.
Davis, J. R. (2001). Alloying: Understanding the basics, ASM International, Materials Park, OH.
Eiselstein, L. E., and Caligiuri, R. D. (1987). “Atmospheric corrosion of the suspension cables on the Williamsburg Bridge.” Degradation of metals in the atmosphere, STP965, S. W. Dean and T. S. Lee eds., ASTM, Conshohocken, PA, 78–95.
Feliu, S., Morcillo, M., and Feliu, J. S., Jr. (1993). “The prediction of atmospheric corrosion from meteorological and pollution parameters—II. Long-term forecasts.” Corros. Sci., 34(3), 415–422.
Furuya, K., Kitagawa, M., Nakamura, S., and Suzumura, K. (2000). “Corrosion mechanism and protection methods for suspension bridge cables.” Struct. Eng. Int., 10(3), 189–193.
Gostautas, R., Carlos, M., Betti, R., and Khazem, D. (2010). “Corrosion monitoring research study of New York City suspension bridges.” CINDE J., 31(4), 12–15.
Haight, R. Q., Billington, D. P., and Khazem, D. (1997). “Cable safety factors for four suspension bridges.” J. Bridge Eng., 157–167.
Holman, J. P. (2010). Heat transfer, 10th Ed., McGraw-Hill Higher Education, Boston.
Huber-Carol, C., Balakrishnan, N., Nikulin, M., and Mesbah, M., eds. (2002). Goodness-of-fit tests and model validity, Birkhäuser, Boston.
Karanci, E., and Betti, R. (2018). “Modeling corrosion in suspension bridge main cables. I: Annual corrosion rate.” J. Bridge Eng.
MATLAB 8.3. [Computer software] MathWorks Inc, Natick, MA.
Matteo, J., Deodatis, G., and Billington, D. P. (1994). “Safety analysis of suspension-bridge cables: Williamsburg Bridge.” J. Struct. Eng., 3197–3211.
Mayrbaurl, R. M., and Camo, S. (2004). “Guidelines for inspection and strength evaluation of suspension bridge parallel wire cables.” NCHRP Rep. 534. Transportation Research Board, Washington, DC.
Modjeski and Masters. (1987). “Mid-Hudson Bridge—Main cable investigation.” Modjeski and Masters, Harrisburg, PA.
NADP (National Atmospheric Deposition Program). (2008). Monthly precipitation-weighted mean concentrations data for New York State monitoring locations, NADP, Champaign, IL.
Nakamura, S.-I., Suzumura, K., and Tarui, T. (2004). “Mechanical properties and remaining strength of corroded bridge wires.” Struct. Eng. Int., 14(1), 50–54.
NCDC (National Climatic Data Center). (2015). Hourly temperature and relative humidity data for New York City, National Oceanic and Atmospheric Administration, New York.
Perry, R. J. (1998). “Estimating strength of the Williamsburg Bridge suspension cables.” Am. Stat., 52(3), 211–218.
Rodriguez, J. J. S., and Patel, H. (1993). Main cable inspection program for the George Washington Bridge, Engineers’ Society of Western Pennsylvania, Pittsburgh, PA.
Shi, Y. W., Deodatis, G., and Betti, R. (2007). “Random field-based approach for strength evaluation of suspension bridge cables.” J. Struct. Eng., 1690–1699.
Sloane, M. J. D., Betti, R., Marconi, G., Hong, A. L., and Khazem, D. (2012). “Experimental analysis of a nondestructive corrosion monitoring system for main cables of suspension bridges.” J. Bridge Eng., 653–662.
Stahl, F. L., and Gagnon, C. P. (1995). Cable corrosion in bridges and other structures: Causes and solutions, ASCE, New York.
Steinman, Boynton, Gronquist, and Birdsall. (1988). Williamsburg Bridge cable investigation program: Final report, New York State Dept. of Transportation, New York.
Steinman, Boynton, Gronquist, and Birdsall. (1991). Cable investigation, New York State Bridge Authority, New York.
Suzumura, K., and Nakamura, S.-i. (2004). “Environmental factors affecting corrosion of galvanized steel wires.” J. Mater. Civ. Eng., 1–7.
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© 2018 American Society of Civil Engineers.
History
Received: Jun 7, 2017
Accepted: Nov 22, 2017
Published online: Mar 16, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 16, 2018
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