Plane-Frame Analysis Applied to Slabs

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Title: Plane-Frame Analysis Applied to Slabs

Author(s): W. Gamble

Publication: Special Publication

Volume: 183

Issue:

Appears on pages(s): 119-130

Keywords: columns; frame method; lateral loads; slabs

Date: 5/1/1999

Abstract:
The Equivalent Frame Method (EFM) of the ACI Code was developed when the predominate method of structural analysis was the Moment Distribution method. It was furthermore developed primarily for vertical loadings. While there exist special-purpose programs intended for slab analysis using the EFM, the purpose of this paper is to present a method of using the EFM approach with an ordinary plane-frame program. This can be accomplished for the vertical loading case by the use of a substitute moment of inertia, Iec, for the columns. For the lateral loading case, the beam which replaces the slab in the analysis has to have a reduced moment of inertia, with the reduction having two parts. One part is to reflect the state of cracking, with the second part being an "effective width" factor which depends on the panel shape.