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Structural monitoring of Rigolets Pass Bridge.
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2009-10-01
[PDF-947.63 KB]
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Edition:Final report; Apr. 1, 2005-Apr. 30, 2009.
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Abstract:The overall objective of this research project was to evaluate the structural behavior of prestressed highperformance
concrete (HPC) long-span bulb-tee girders utilized in Louisiana bridge construction. To
accomplish this objective, one span of the Rigolets Pass Bridge was instrumented and monitored to obtain
measured strain and deflection data for a period of one year after completion of construction. Four 131-ft.
(40-m) long, BT-78 girders fabricated using HPC were instrumented to measure concrete strains and
deflections at midspan. During fabrication of the four instrumented girders, representative samples of the
prestressing strand and HPC were obtained and used for material property studies. After fabrication, the
four instrumented girders were used to construct Span 43 of the Rigolets Pass Bridge.
After erecting the instrumented girders at the bridge site, an HPC deck slab was added. During the deck
slab construction for Span 43, instrumentation was added to measure concrete strains at midspan. Samples
of the deck slab concrete were also obtained and used for material property studies.
Throughout the bridge construction process, instrumentation readings were taken and recorded at selected
time- or event-based intervals. After completion of the Rigolets Pass Bridge construction, the strain gauge
instrumentation installed in the HPC girders and deck slab of Span 43 were connected to an automated onsite
data acquisition system with remote access capabilities. The on-site data acquisition system was used
to record concrete temperature and strain data at selected time increments for a period of one year after
completion of construction. Manual measurements of midspan deflections were taken for Span 43 at the
beginning, middle, and end of the one-year bridge monitoring period.
This final report documents results from both instrumentation monitoring and material property studies
performed for Span 43 of the Rigolets Pass Bridge. The results obtained from this research provide detailed
information related to the long-term behavior of a long-span structure fabricated using HPC. Findings and
conclusions drawn from this research can be used by the Louisiana Department of Transportation and
Development (LADOTD) to develop specifications and designs for future HPC bridge structures.
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