Moments in Edge Panels of Flat Plate Floors
Publication: Journal of Structural Engineering
Volume 109, Issue 11
Abstract
Tests have recently been conducted at the University of New South Wales on half‐scale models of edge panels of a reinforced concrete flat plate floor. Moments were measured along lines parallel to the edge of the building: (1) Just inside the spandrel; (2) at mid‐span; and (3) at the first interior column. The measurements provided the distribution of slab moments across a panel and, thus, by integration, the total panel moment at each of these locations.
The current ACI Code prescribes two alternative methods for the determination of slab moments, i.e., the Equivalent Frame Method and the Direct Design Method. The test results indicate that for calculating the full panel moment, the first of these is unnecessarily complex and bears no relation to reality.
Modifications to the Code methods are suggested which are not only simpler but consistent with observed behavior. Tests also indicate the degree of loss of stiffness which might be expected after cracking.
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References
1.
“Building Code Requirements for Reinforced Concrete (ACI 318‐77),” ACI Committee 318, American Concrete Institute, Detroit, Mich., 1977.
2.
Corley, W. G., and Jirsa, J. O., “Equivalent Frame Analysis for Slab Design,” ACI Journal, Proceedings, Vol. 67, No. 11, Nov., 1970, pp. 875–884.
3.
Hall, A. S., and Rangan, B. V., “Forces in the Vicinity of Edge Columns in Flat Slab Floors,” Magazine of Concrete Research, No. 122, London, Mar., 1983.
4.
Rangan, B. V., and Hall, A. S., “Forces in the Vicinity of Edge Columns in Flat Plate Floors; Vol. 1—Tests on R.C. Models,” UNICIV Report No. R‐203, The University of New South Wales, Kensington, Australia, Jan., 1983.
5.
“SAA Concrete Structures Code, AS 1480‐1982,” Standards Association of Australia, Sydney, Australia, 1982.
6.
Wiesinger, F. P., “Design of Flat Plates with Irregular Column Layout,” ACI Journal, Proceedings, Vol. 70, No. 2, Feb., 1973, pp. 117–123.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 109 • Issue 11 • November 1983
Pages: 2638 - 2650
Copyright
Copyright © 1983 ASCE.
History
Published online: Nov 1, 1983
Published in print: Nov 1983
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