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Proceedings Paper

Instrument to determine prestress remaining in a damaged bridge girder
Author(s): Scott A. Civjan; James O. Jirsa; Ramon L. Carrasquillo; David W. Fowler
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Paper Abstract

An instrument has been developed to estimate stress levels in prestress strands in existing members. The prototype instrument applies a lateral load to an exposed prestressing strand and measures the resulting displacements. The instrument was calibrated for 0.5-inch (12.7 mm) diameter seven-wire strand with exposed lengths of 1.5 feet (0.46 m) to 3.75 feet (1.14 m). It was tested to determine its accuracy, precision, and usefulness in the field. Strand forces were consistently estimated to within ten percent of the actual load. The device was also utilized in the placement of strand splices and was found to be more reliable in checking induced strand tensions than the standard torque wrench method.

Paper Details

Date Published: 31 March 1998
PDF: 5 pages
Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); doi: 10.1117/12.300104
Show Author Affiliations
Scott A. Civjan, Univ. of Texas/Austin (United States)
James O. Jirsa, Univ. of Texas/Austin (United States)
Ramon L. Carrasquillo, Univ. of Texas/Austin (United States)
David W. Fowler, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3400:
Structural Materials Technology III: An NDT Conference
Ronald D. Medlock; David C. Laffrey, Editor(s)

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