American Society of Civil Engineers

Flexural Strength of Flat Slabs at Exterior Columns

by Harinatha B. Goli, (Reader in Civ. Engrg., Andhara Univ., Waltair, Andhra Pradesh, India) and Hans Gesund, F.ASCE, (Prof. of Struct. Engrg., Univ. of Kentucky, Lexington, Ky. 40506)

Journal of the Structural Division
, Vol. 108, No. 11, November 1982, pp. 2479-2495

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Document type: Journal Paper
Abstract: The flexural strength of exterior panels of flat slab structures is investigated by use of Yield Line Theory. Six controlling, geometrically admissible, collapse mechanisms are identified, three of which involve local flexural failures around the columns. The loading is uniformly distributed, the columns are rectangular, and the reinforcement is arranged orthotropically. The coefficient of orthotropy and the ratio of negative to positive yield moment may vary arbitrarily. The governing equations for the six mechanisms are derived and presented in dimensionless form. Based on numerical solutions of four of the equations, a set of graphs is provided which covers practical ranges of the important physical and geometrical parameters. These graphs are useful for the analysis or design of the exterior slab panels. In addition, an equation is derived which gives an upper bound on the bending moment which the slab can transfer into the exterior column at collapse load through flexural action.

ASCE Subject Headings:
Flexural strength
Limit design
Reinforced concrete