Equivalent Unbonded Length for Modeling of Multistrand Tendons in Precast Segmental Construction

AbstractRecently 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 multistrand tendon. Neither the seismic design guideli...

Full description

Saved in:
Bibliographic Details
Published in:Journal of bridge engineering 2014-01, Vol.19 (1), p.101-109
Main Authors: Veletzos, Marc J, Restrepo, José I
Format: Article
Language:English
Subjects:
Technical Papers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:AbstractRecently 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 multistrand 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 multistrand tendons. Results indicate that tendon slip relative to the grout is small in comparison with slip between the duct and the surrounding concrete. An equation to evaluate the equivalent unbonded length of multistrand tendons was developed with direct application to modeling of the segment joint response.
ISSN:1084-0702
1943-5592
DOI:10.1061/(ASCE)BE.1943-5592.0000502