Evaluation of continuity detail for precast prestressed girders : tech summary.
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2011-08-01
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Abstract:Building multi-simple span bridges using precast prestressed concrete girders is an easy construction. However, the existence of
expansion joints often leads to a host of problems in their vicinity due to drainage leaks. Furthermore, debris accumulation aff ects
the performance of expansion joints. Building continuous bridges reduces maintenance costs and adds redundancy to the structural
system. Therefore, the development of connection details between precast elements has been the subject of research for an extended
period of time. A new continuity detail is adopted in the John James Audubon Bridge that diff ers from the current standard detail
in Louisiana. The detail is based on the recommendation of the National Cooperative Highway Research Program (NCHRP) Project
12-53 (Report 519). The performance of the new detail was monitored using a 96-channel monitoring system that has embedded and
surface-mounted sensors to measure strains, temperatures, rotations, and gap openings in critical locations in the monitored segment.
Data from about 24 months of monitoring were collected, processed, and analyzed. Analyses based on Project 12-53 (NCHRP Report
519) models and fi nite element models were also conducted to further understand the behavior of the new detail. Finally, static and
dynamic load tests were carried out on the monitored segment.
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