Title:
Improved Equivalent Frame Analysis Method for Flat Plate Structures in Vicinity of Edge Columns
Author(s):
Karl A. Murray, David J. Cleland, Stephen G. Gilbert, and Richard H. Scott
Publication:
Structural Journal
Volume:
100
Issue:
4
Appears on pages(s):
454-464
Keywords:
column; flat plate; moment; reinforced concrete; reinforcement.
DOI:
10.14359/12654
Date:
7/1/2003
Abstract:
This paper proposes a modification to the ACI 318-02 equivalent frame method of analysis of reinforced concrete flat plate exterior panels. Two existing code methods were examined: ACI 318 and BS 8110. The derivation of the torsional stiffness of the edge strip as proposed by ACI 318 is examined and a more accurate estimate of this value is proposed, based on both theoretical analysis and experimental results. A series of 1/3-scale models of flat plate exterior panels have been tested. Unique experimental results were obtained by measuring strains in reinforcing bars at approximately 200 selected locations in the plate panel throughout the entire loading history. The measured strains were used to calculate curvature and, hence, bending moments; these were used along with moments in the columns to assess the accuracy of the equivalent frame methods. The proposed method leads to a more accurate prediction of the moments in the plate at the column front face, at the panel midspan, and in the edge column.