Thermal Effects on Load Capacity of Concrete Slabs

by Nestor R. Iwankiw, (A.M.ASCE), Manager and Research Engineer; Structural Analysis, Engrg. Div., Illinois Inst. of Tech. Research Inst., Chicago, Ill.,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 7, Pg. 1417-1433

Document Type: Journal Paper


The summary of an approach for a limit analysis in a fire environment of a two-way reinforced concrete rectangular slab containing fixed edges along the four sides is presented. The yield line theory of structural analysis for determination of the ultimate load-carrying capacity of reinforced concrete slabs was extended to include high temperature effects. Large displacements, membrane action, temperature-dependent mechanical properties, and thermally induced strains were taken into account. A FORTRAN computer program based on the analysis was written and validated. A short parametric study was conducted with the developed analytical method to determine the influence of slab aspect ratio and of two temperature profile parameters on the ultimate load capacity.

Subject Headings: Thermal loads | Load bearing capacity | Reinforced concrete | Temperature effects | Load factors | Concrete slabs | Thermal analysis | Parameters (statistics)

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