TY - CONF
T1 - SHM for the evaluation of prestressing forces and early-age cracks
AU - Abdel-Jaber, H.
AU - Glisic, B.
N1 - Funding Information:
This work was partially supported by the National Science Foundation Grant No. CMMI-1362723. 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 National Science Foundation. The Streicker Bridge project has been realized with the great help and kind collaboration of several professionals and companies. We would like to thank Steve Hancock and Turner Construction Company; Ryan Woodward and Ted Zoli, HNTB Corporation; Dong Lee and A G Construction Corporation; Steven Mancini and Timothy R Wintermute, Vollers Excavating and Construction, Inc.; SMARTEC SA, Switzerland; Micron Optics, Inc., Atlanta, GA; Geoffrey Gettelfinger; James P Wallace; Miles Hersey; Paul Prucnal; Yanhua Deng; Mable Fok; and Faculty and staff of the Department of Civil and Environmental Engineering. The following students installed the sensors on Streicker Bridge: Chienchuan Chen, Jeremy Chen, Jessica Hsu, George Lederman, Kenneth Liew, Maryanne Wachter, Allsion Halpern, David Hubbell, Morgan Neal, Daniel Reynolds, and Daniel Schiffner. Special thanks to Dorotea Sigurdardottir for the permission to use her drawings.
Publisher Copyright:
© 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved.
PY - 2015
Y1 - 2015
N2 - There has been a significant increase in the use of prestressed concrete as a building material. In 2009 and 2010, prestressed concrete bridges composed 44% of all newly built and replaced bridges in the US. With the increased need for structural health monitoring (SHM) for bridge assessment and the increased use of prestressed concrete for building bridges, the need for the identification of monitoring parameters and the development of damage detection algorithms specific to prestressed concrete increased. In this paper, the parameters evaluated are the prestressing force value at transfer of the prestressing force and the width of early-age cracks. Transfer of the prestressing force in accordance with design values is of extreme importance because improper transfer can result in failure or malfunction at loads lower than predicted by designers. Early-age cracks can develop in prestressed concrete bridges prior to the transfer of the prestressing force due to shrinkage and thermal stresses. Partial or full closure of the cracks can occur during transfer of the force. Monitoring of the residual crack opening is important in order to ensure continued structural integrity or predict reduced structural capacity. This paper outlines two created methods that use a statistical approach for monitoring prestressing forces and the condition of early-age cracks by accounting for uncertainties and setting thresholds. The methods have been validated through application to two real-life structures, the main span and the southeast leg of Streicker Bridge on the Princeton University campus, and comparison to design values.
AB - There has been a significant increase in the use of prestressed concrete as a building material. In 2009 and 2010, prestressed concrete bridges composed 44% of all newly built and replaced bridges in the US. With the increased need for structural health monitoring (SHM) for bridge assessment and the increased use of prestressed concrete for building bridges, the need for the identification of monitoring parameters and the development of damage detection algorithms specific to prestressed concrete increased. In this paper, the parameters evaluated are the prestressing force value at transfer of the prestressing force and the width of early-age cracks. Transfer of the prestressing force in accordance with design values is of extreme importance because improper transfer can result in failure or malfunction at loads lower than predicted by designers. Early-age cracks can develop in prestressed concrete bridges prior to the transfer of the prestressing force due to shrinkage and thermal stresses. Partial or full closure of the cracks can occur during transfer of the force. Monitoring of the residual crack opening is important in order to ensure continued structural integrity or predict reduced structural capacity. This paper outlines two created methods that use a statistical approach for monitoring prestressing forces and the condition of early-age cracks by accounting for uncertainties and setting thresholds. The methods have been validated through application to two real-life structures, the main span and the southeast leg of Streicker Bridge on the Princeton University campus, and comparison to design values.
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M3 - Paper
AN - SCOPUS:84978727255
T2 - 7th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2015
Y2 - 1 July 2015 through 3 July 2015
ER -