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Elevated post-tensioned slab cracks

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I have a residential building with two levels of subterranean parking of
post-tensioned, two-way flat plate. The intermediate level slab has through
craks, ranging fom hairline to 1/4" wide. Most of the cracks run parallel to
the distributed tendons, and there is at least one in each bay. Most of the
cracks run the full width of the slab( wall to wall.) The 1/4" wide crack
occurs near a partial step in the slab with two sets of banded strands
pulling in opposite directions perpendicular to the step ( the step is
parallel to the distributed tendons as well.) The 1/4" crack has spalled
edges at one location and the slab surface has a slight vertical offset.

The as-built drawings do not show any pour strips or slip connections at the
perimeter walls and there are wall cracks at some of the slab crack
locations. Obviousely the slab is restrained and that's what caused the
craks to remain open.

I would appreciate comments from anyone with experience in dealing with
similar situations regarding the significance of the cracks with respect to
the structural pefrormance of the slab.

Thanks in advance.

Oshin Tosounian, S.E.
Los Angeles


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