Title:
Minimum Thickness Requirements for Control of Two-Way Slab Deflections
Author(s):
David P. Thompson and Andrew Scanlon
Publication:
Structural Journal
Volume:
85
Issue:
1
Appears on pages(s):
12-22
Keywords:
building codes; concrete construction; cracking (fracturing); deflection; flat concrete plates; flat concrete slabs; loads (forces); thickness; two-way slabs; Structural Research
DOI:
10.14359/2950
Date:
1/1/1988
Abstract:
An evaluation is made of North American code provisions for minimum thickness of two-way slabs without beams between interior columns. Based on a parametric study involving 344 slab analyses, it was found that slabs designed on the basis of the current code minimum thickness satisfy the l/240 code limit on permissible computed incremental deflection. In some cases the l/480 limit was exceeded. In all cases, the live load deflection was satisfactory. Several modifications to the current code provisions are recommended, including a 10 percent increase in minimum thickness for systems with panel aspect ratios equal to one.