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Title: Field Measurements of Prestress Losses in External Tendons

Author(s): Carin L. Roberts-Wollmann, Jose A. Arrellaga, John E. Breen, and Michael E. Kreger

Publication: Structural Journal

Volume: 93

Issue: 5

Appears on pages(s): 595-601

Keywords: external tendons; field measurements; prestress loss; seg-mental bridges.

DOI: 10.14359/9718

Date: 10/1/1996

Abstract:
This paper presents the results of a field study of losses in external post-tensioning tendons. An innovative measurement system was developed to measure strains in external tendon bundles. The system was installed on a total of 16 tendons in an urban viaduct of segmental post-tensioned box girders. Measurements were taken to study initial prestress losses, such as losses through stressing hardware, friction losses, seating losses, and elastic shortening losses. Measurements continued for over a year to study time-dependent losses. Recommendations are presented for modifications to the current methods for calculating prestress losses in external tendons pre-sented in the AASHTO Guide Specification for the Design and Construc-tion of Segmental Concrete Bridges.


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