Field Test and Finite-Element Modeling of a Three-Span Continuous-Girder Bridge
Publication: Journal of Performance of Constructed Facilities
Volume 28, Issue 1
Abstract
A live-load test and a three-dimensional (3D) finite-element (FE) model of a three-span continuous prestressed–concrete girder bridge are described in this paper. The precast prestressed-concrete simple-span girders are made continuous by pouring a continuity diaphragm between the girders ends. Special reinforcement is extended from the girders’ bottom flanges into the diaphragm to ensure continuity under positive moments that result from time-dependent effects such as creep, shrinkage, and temperature gradient. This detail was adopted in a recently constructed bridge. The bridge has been instrumented with embedded and surface-mounted sensors and was monitored for over 2 years to evaluate the performance of the new continuity detail. A live-load test was carried out to evaluate the response of the new detail under truck loads. Field test data were used to validate a 3D FE model that was developed for the entire monitored segment. Once the FE model was validated, it was used to investigate the efficiency of the detail in transferring loads between adjacent girders. From the FE results, it has been found that the continuity index is approximately 88%.
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Acknowledgments
The field study reported in this paper is sponsored by the Louisiana Transportation Research Center under Project No. 08-1ST. Additional support from Louisiana State University is also acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsoring agencies. The authors thank Mr. Walid Alaywan, P.E. (LTRC), Mr. Hussein Ghara, P.E., and Mr. Paul Fossier, P.E. (LA-DOTD), Boh Brothers (general contractor), Dunham Price (precaster), and Bridge Diagnostics (sensor installation) for their invaluable input and support to this project.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 28 • Issue 1 • February 2014
Pages: 136 - 148
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 5, 2012
Accepted: Sep 12, 2012
Published online: Sep 14, 2012
Published in print: Feb 1, 2014
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