Settlement Behavior of Posttensioned Slabs-on-Grade
Publication: Journal of Performance of Constructed Facilities
Volume 12, Issue 2
Abstract
The purpose of this paper is to describe the settlement behavior of posttensioned slab-on-grade. The two case studies illustrate that the amount of damage to the structure depends on how the posttensioned slab-on-grade deforms. For the first case study, about one-half of the posttensioned slab-on-grade was unaffected by soil movement and remained relatively level, whereas the remaining one-half of the slab settled. This caused the development of a slab crack and hinge point, where moderate damage occurred in the area parallel to the slab crack. The Skempton and MacDonald settlement criteria and the severity of damage versus foundation deformation parameters were applicable for this case. For the second case study, which was the settlement of deep fill, there was a tendency for the posttensioned slab-on-grade to tilt uniformly (no hinge point). This resulted in substantially less damage than the first case study, even though the maximum differential settlement was greater for the second case. The severity of damage versus foundation deformation parameters were not applicable for this case. One advantage of posttensioned slab-on-grade that was common for both cases was that the slab cracks were relatively small, due to the posttensioning (compression) effect, which enabled the slab to resist the tension forces due to fill settlement.
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Published In
Journal of Performance of Constructed Facilities
Volume 12 • Issue 2 • May 1998
Pages: 56 - 61
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 1998
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