Abstract
Diagnostic load rating of highway bridges using distributed strain transducers is one of the more prominent strategies applied for both periodic and continuous monitoring of highway bridges. Techniques for load rating structures using experimental measurements of neutral axis locations, girder distribution factors, and dynamic increase factors have been suggested for structural health monitoring and damage detection applications. However, practical considerations related to the influence of measurement uncertainties on the reliability of these diagnostic measures in the presence of damage have only been examined recently. This paper extends uncertainty propagation formulae previously derived for neutral axis measurements to girder distribution factors. The significance of measurement uncertainties on damage-sensitive features are then explored using experimental data from a real bridge subjected to progressive, prescribed damage. The experimental results suggest that both apparent neutral axis locations and girder distribution factors exhibit sensitivity to the damage mechanisms introduced that exceeds the measurement uncertainty. In addition, girder distribution factors are found to demonstrate the ability to locate the damage. Comparisons with finite element simulations underline the challenges associated with faithfully modeling the effects of structural damage and emphasize the need for continued full-scale validation of structural health monitoring approaches on real structures.
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References
Stallings J, Yoo C (1993) Tests and ratings of short-span steel bridges. J Struct Eng 119(7):2150–2168
Bakht B, Jaeger LG (1990) Bridge testing—a surprise everytime. J Struct Eng 116(5):1370–1383
Burdet OL (1993) Load testing and monitoring of Swiss bridges. Comité European du Béton, Safety and Performance Concepts, Lausanne, Switzerland
Pressley JS, Candy CCE, Walton BL, Sanjayan JG (2004) Destructive load testing of bridge No. 1049—analyses, predictions, and testing. In: Austroads 5th Bridge Conference, Hobart, Australia, May 1–12
Ni YQ, Xia HW, Ye XW (2012) Neutral-axis position based damage detection of bridge deck using strain measurement: numerical and experimental verification. In: 6th European workshop on structural health monitoring, Dresden, Germany, July 3–6
Sigurdardottir DH, Glisic B (2013) Neutral axis as damage sensitive feature. Smart Mater Struct 22(7):1–18
Plude S (2011) Implementing a long-term bridge monitoring strategy for a composite steel girder bridge. Master’s Thesis, University of Connecticut
Kim S, Nowak AS (1997) Load distribution and impact factors for I-girder bridges. J Bridge Eng 2(3):97–104
Cardini AJ, DeWolf JT (2009) Long-Term structural health monitoring of a multi-girder steel composite bridge using strain data. Struct Health Monit 8(1):47–58
Reiff AJ (2014) Bridge structural health monitoring using statistical damage detection and advanced load rating methods. Masters of Science Thesis, Tufts University, Medford, MA, p 139
Joint Committee for Guides in Metrology (JCGM) (2008) Evaluation of measurement data—guide to the expression of uncertainty in measurement. Guide JCGM 100:2008
Glisic B, Inaudi D (2008) Fibre optic methods for structural health monitoring. Wiley, Chichester
Ghosn M, Moses F, Gobieski J (1986) Evaluation of steel bridges using in-service testing. Transp Res Rec 172:71–78
Rabinovich S (2005) Measurement errors and uncertainties: theory and practice. Springer, New York
Elhelbawey M, Fu CC, Sahin MA, Schelling DR (1999) Determination of slab participation from weigh-in-motion bridge testing. J Bridge Eng 4(3):165–173
Federal Highway Administration (2014) Tables of frequently requested NBI information. http://www.fhwa.dot.gov/bridge/britab.cfm. Accessed 30 Nov 2014
Whelan MJ, Janoyan KD (2010) In-service diagnostics of a highway bride from a progressive damage case study. J Bridge Eng 15(5):597–607
Gangone MV, Whelan MJ, Janoyan KD, Minnetyan L (2013) Development of performance assessment tools for a highway bridge resulting from controlled progressive damage monitoring. Struct Infrastruct Eng 10(5):551–567
Whelan MJ, Janoyan KD (2009) Design of a robust. High-rate wireless sensor network for static and dynamic structural monitoring. J Intell Mater Syst Struct 20(7):849–863
Van Overschee P, DeMoor B (1996) Subspace identification for linear systems. Kluwer Academic Press, Boston
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The authors would like to acknowledge the New York State Department of Transportation and, in particular, the Region 7 engineers and bridge maintenance crew for facilitating and assisting with the field testing.
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Whelan, M.J., Gangone, M.V. Effect of measurement uncertainties on strain-based damage diagnostics for highway bridges. J Civil Struct Health Monit 5, 321–335 (2015). https://doi.org/10.1007/s13349-015-0110-2
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DOI: https://doi.org/10.1007/s13349-015-0110-2