Experimental Analysis of Limit States in a Six-Panel Waffle Flat-Plate Structure

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Title: Experimental Analysis of Limit States in a Six-Panel Waffle Flat-Plate Structure

Author(s): Andrzej D. Ajdukiewicz and Alina T. Kliszczewicz

Publication: Journal Proceedings

Volume: 83

Issue: 6

Appears on pages(s): 909-915

Keywords: columns (supports); cracking (fracturing); deflection; failure; flat concrete plates; flexural strength; limit design method; moment distribution; reinforced concrete; structural design; waffle slabs.

Date: 11/1/1986

Abstract:
Waffle slabs are being used increasingly in flat-plate structures for large-span frameworks, but there is limited information on these structures in the elastic stage as well as in limit states. This paper presents results obtained from tests on a large-scale (approximately 1:3) model of a six-panel waffle slab supported on twelve columns. The location of main cracks, the mechanism of failure, and the magnitude of destructive loads are considered. Tests indicated that the main negative yield line is located comparatively far from column face, and depends on the solid region around the column and the extension of top reinforcement. Recommendations for yield-line pattern in waffle-slab flat plates are discussed.