Equivalent Frame Analysis Improvements for Slab Design


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Title: Equivalent Frame Analysis Improvements for Slab Design

Author(s): S. K. Sharan, D. Clyde, and D. Turcke

Publication: Journal Proceedings

Volume: 75

Issue: 2

Appears on pages(s): 55-59

Keywords: building codes; columns (supports); concrete slabs; elastic analysis; finite element method; frames; loads (forces); reinforced concrete; stiffness; structural analysis; structural design; torsion.

Date: 2/1/1978

A improved equivalent frame method is proposed. It is demonstrated analytically that the equvilant member stiffness depended primarily whether the slab or column is loaded. This conclusion is supported by both numerical and experimental evidence. For both the column-loaded case it was found that the column stiffness should be increased. This is contrary to the ACI 318-71 assumption of a reduced effective stiffness. Using the results of an in-depth numerical analysis of numerous slab-column structures, convenient design curves are provided to obtain equvilant member stiffnesss directly. Comparitive results are shown between the current ACI method, the proposed scheme, and the experimental results. The proposed method is found to produce results in close agreement with the experimental results.