Equivalent Unbonded Length for Modeling of Multi-strand Tendons in Precast Segmental Construction

Recently issued seismic design guidelines for precast segment construction require nonlinear modeling of segment-to-segment joints of important bridges. The response of segment joints is highly dependent on the length of debonding of the multi-strand tendon. Neither the seismic design guidelines nor...

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Bibliographic Details
Published in:Journal of bridge engineering 2013-05
Main Authors: Veletzos, Marc J, Restrepo, Jose I
Format: Article
Language:English
Subjects:
Debonding
Equivalence
Guidelines
Modelling
Segments
Seismic design
Slip
Tendons
Online Access:Get full text
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Description
Summary:Recently issued seismic design guidelines for precast segment construction require nonlinear modeling of segment-to-segment joints of important bridges. The response of segment joints is highly dependent on the length of debonding of the multi-strand tendon. Neither the seismic design guidelines nor the literature provide sufficient guidance on how to determine the equivalent unbonded length of such tendons. This paper presents key results and conclusions of a large scale experimental research program that investigated the debonding characteristics of multi-strand tendons. Results indicate that, tendon slip relative to the grout is small in comparison to slip between the duct and the surrounding concrete. An equation to evaluate the equivalent unbonded length of multi-strand tendons was developed with direct application to modeling of the segment joint response.
ISSN:1084-0702
DOI:10.1061/(ASCE)BE.1943-5592.0000502