Application of shrinkage prediction models to restraint crack formation in unbonded post-tensioned slabs
Gabriela R. Martínez Lara,Myoungsu Shin,Yong-Hoon Byun,Goangseup Zi,Thomas H.-K. Kang
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.
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
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