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Computers and Concrete Volume 33, Number 4, April 2024 (Special Issue) pages 349-359 DOI: https://doi.org/10.12989/cac.2024.33.4.349 |
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Application of shrinkage prediction models to restraint crack formation in unbonded post-tensioned slabs |
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Gabriela R. Martínez Lara, Myoungsu Shin, Yong-Hoon Byun, Goangseup Zi and Thomas H.-K. Kang
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| 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. | ||
| Key Words | ||
| crack formation; post-tensioning concrete slabs; restraint crack; shrinkage prediction | ||
| Address | ||
| Gabriela R. Martínez Lara and Thomas H.-K. Kang: Department of Architecture and Architectural Engineering & Institute of Engineering Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea Myoungsu Shin: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea Yong-Hoon Byun: School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea Goangseup Zi: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea | ||