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

Research output: Contribution to journalArticlepeer-review

Abstract

This study aims to investigate the effect of restraint configuration on crack formation due to shrinkage-and-creep-induced 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.

Original languageEnglish
Pages (from-to)349-359
Number of pages11
JournalComputers and Concrete
Volume33
Issue number4
DOIs
Publication statusPublished - 2024 Apr

Bibliographical note

Publisher Copyright:
Copyright © 2024 Techno-Press, Ltd.

Keywords

  • crack formation
  • post-tensioning concrete slabs
  • restraint crack
  • shrinkage prediction

ASJC Scopus subject areas

  • Computational Mechanics

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