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Title: Rotational Stiffness of Concrete Slabs

Author(s): Mehrdad Mehrain and Bijan Aalami

Publication: Journal Proceedings

Volume: 71

Issue: 9

Appears on pages(s): 429-435

Keywords: bending moments; building codes; columns (supports); elastic analysis; finite difference theory; finite element method; fiat concrete plates;

DOI: 10.14359/7093

Date: 9/1/1974

Abstract:
Using a finite element elastic plate analysis, lower and upper limits to the rotational stiffness of a flat slab at the column-slab junction are evaluated for a number of typical square slabs on a central column. The slabs represent unit panels of multiple-slab floors. The stiffnesses determined are presented in a graphical form and may be used in the equivalent-frame method in design of multiple square slabs. The results are comprehensive and effectively serve to clarify the picture of slab stiffness behavior. They also provide a useful basis for the accuracy assessment of the current approximate methods of stiffness evaluation. A comparison with the related recommendations of ACI 318-71 shows that the Code underestimates the slab stiffness for certain column-slab geometrics. The resulting lower bound solutions for slab stiffness and maximum moment coefficients closely agree with those previously available. A numerical example is given to illustrate the use of the data offered.