Design Curves for Long Reinforced Concrete Columns

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Title: Design Curves for Long Reinforced Concrete Columns

Author(s): Thomas C. Edwards and Phil M. Ferguson

Publication: Journal Proceedings

Volume: 62

Issue: 7

Appears on pages(s): 751-762

Keywords: column, design, long column, reinforced concrete.

Date: 7/1/1965

Abstract:
The 1963 ACI Code specifies load reduction factors for long columns that are dependent on their deflected shape and flexibility (h/r ratio) and a strength reduction factor. In design the choice of the governing Code provision isnot readily apparent and, even without sidesway, two loadings must be considered. The Code further specifies that members with small com-pressive load may be designed for bending alone. This clause introduces the problem of determining the point where the design for axial load and bending becomes less economical than for moment alone, The chart developed here enables the designer to compare the several cases and to quickly determine the final design in one operation.