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Alternative Title:Long-term monitoring of the high performance concrete Charenton Canal Bridge
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Edition:Final report; Mar. 2006-Aug. 2010.
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Abstract:The report contains long-term monitoring data collection and analysis of the first fully high
performance concrete (HPC) bridge in Louisiana, the Charenton Canal Bridge. The design of this
bridge started in 1997, and it was built and opened to traffic in 1999. High-strength concrete was used
in the precast prestressed, concrete piles and girders. High performance cast-in-place concrete was
used in the abutment, wing walls, pile caps, approach slabs, barriers slabs, and barrier rails.
After the bridge was constructed, this study was initiated. The objective was to continue the long-term
data collection and analysis for the instrumented bridge. The long-term monitoring consisted of
collecting data from embedded strain gauges in the deck and four girders of Span 3 of the five-span
structure. Data collected were for (1) deck strains at the mid span of Span 3; (2) prestress losses at the
mid span of Girders 3A, 3B, 3C, and 3D; and (3) camber and deflection of Girders 3A, 3B, 3C, and 3D.
It was observed that (1) the maximum absolute strain in the deck was 77 millionths, (2) the maximum
prestress loss in the girders was slightly less than 50,000 psi with time-dependent losses being at about
2 percent of the total losses, and (3) measured camber and deflection of the instrumented girders was in
the range of 1.5 to 1.8 in.
In conclusion, values reported for strains in the deck, prestress losses in the girders and
camber/deflection of the instrumented girders seem to fit very well within acceptable limits.
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