Application of shrinkage prediction models to restraint crack formation in unbonded post-tensioned slabs
- Year
- 2024
- Journal
- Computers and Concrete
- volume
- 33(4)
- Page
- 349-359
- Author
- Gabriela R. Martínez Lara; Myoungsu Shin; Yong-Hoon Byun; Goangseup Zi; Thomas H.-K. Kang
- status of publication
- Published
- Link
- https://doi.org/10.12989/cac.2024.33.4.34987회 연결
Abstract
This study aims to investigate the effect of restraint configuration on crack formation due to shrinkage-and-creepinduced volumetric change in unbonded post-tensioned slabs. The first part of this study focuses on the comparison of existing shrinkage and creep calculation models that are used to predict the volume-changing behavior of concrete. The second part of this study presents the finite element analysis of a series of architectural configuration prototypes subjected to shrinkage and creep, which comprise unbonded post-tensioned slabs with various restraint configurations. The shrinkage and creep effects were simulated in the analysis by imposing strains obtained from one selected calculation model. The results suggest that a slab up to 300 ft. (90 m) in length does not require a closure strip if it is unrestrained by perimeter walls, and that the most effective restraint crack mitigation strategy for a slab restrained by perimeter walls is a partial wall release.
