Determination of Slab Thickness in Suspended Post-Tensioned Floor Systems


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Title: Determination of Slab Thickness in Suspended Post-Tensioned Floor Systems

Author(s): R. I. Gilbert

Publication: Structural Journal

Volume: 86

Issue: 5

Appears on pages(s): 602-607

Keywords: building codes; concrete slabs; deflection; flat concrete slabs; post-tensioning; prestressed concrete; serviceability; span-depth ratio; structural design; thickness; two-way slabs; Design

Date: 9/1/1989

A simple expression is presented for the maximum span-to-depth ratio of post-tensioned concrete floor systems. The expression provides an initial estimate of the minimum slab thickness required to limit deflection to some preselected value and forms the basis of a design approach for serviceability. The procedure is an extension of the deemed-to-comply span-to-depth ratios for reinforced concrete slabs that form part of the deflection control provisions in the new Australian Standard for Concrete Structures, AS3600-1988. The procedure described in the paper is illustrated by several numerical examples.