Measurement of Restraint Moment Effect on Lab Specimens with Precast Girders Made Continuous

Mohammed Ibrahim*, Mauro Poliotti, Yuguang Yang, Max A. N. Hendriks

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review


Typically precast girders are designed and utilized as simple supported members. Alternatively, the precast girders can be made continuous at the intermediate support using cast-in-place concrete topping. Once the girders are made continuous, time-dependent restraint moments will occur. The magnitude of the restraint moment is mainly affected by the creep and shrinkage behaviour of the concrete and the age of the girders at continuity. The developing restraint moment may affect the stress conditions near the support region and, in extreme cases, result in the loss of the integrity of the structural member. Currently, full-scale experimental campaign is underway on the shear behaviour precast continuous girders at Delft University of Technology. Inverted T girders are individually cast and later made continuous after a certain period. To investigate the influence of restrained action and quantify the prestress losses, fiber optic sensors (FOS) are embedded in the girders. By utilizing the FOS, the evolution of the concrete strain is monitored. This paper presents the measurement of the time-dependent strains. Furthermore, the concrete strains are analysed to evaluate the prestress loss and time-dependent restraint moment effect.
Original languageEnglish
Title of host publicationBuilding for the Future: Durable, Sustainable, Resilient.
Subtitle of host publicationProceedings of the fib Symposium 2023 - Volume 2
EditorsAlper Ilki, Derya Çavunt, Yavuz Selim Çavunt
Number of pages10
ISBN (Electronic)978-3-031-32511-3
ISBN (Print)978-3-031-32510-6, 978-3-031-32513-7
Publication statusPublished - 2023
EventInternational Symposium of the International Federation for Structural Concrete, fib Symposium 2023 - Istanbul, Turkey
Duration: 5 Jun 20237 Jun 2023

Publication series

NameLecture Notes in Civil Engineering
PublisherSpringer Cham
Volume350 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


ConferenceInternational Symposium of the International Federation for Structural Concrete, fib Symposium 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Creep
  • Differential shrinkage
  • Fiber optic sensors
  • Precast girders
  • Restraint moments

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