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.
|Title of host publication
|Building for the Future: Durable, Sustainable, Resilient.
|Subtitle of host publication
|Proceedings of the fib Symposium 2023 - Volume 2
|Alper Ilki, Derya Çavunt, Yavuz Selim Çavunt
|Number of pages
|Published - 2023
|International Symposium of the International Federation for Structural Concrete, fib Symposium 2023 - Istanbul, Turkey
Duration: 5 Jun 2023 → 7 Jun 2023
|Lecture Notes in Civil Engineering
|International Symposium of the International Federation for Structural Concrete, fib Symposium 2023
|5/06/23 → 7/06/23
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- Differential shrinkage
- Fiber optic sensors
- Precast girders
- Restraint moments