Synopsis
The aim of the work described in this paper is to present a new approximate method for estimating the strength of reinforced concrete columns in rigid framed structures. The method employs a deteriorating stiffness stability concept combined with a modified use of the conventional short-column moment-thrust interaction diagram. When compared with ‘exact’ computer-based solutions, the method is shown to predict failure loads very accurately (mean = 99%, coefficient of variation =4%) over a broad range of significant design parameters. The scope of the work is limited to symmetrical single-curvature, no-sway cases at this time, but the results obtained suggest that the method, when properly modified, can provide a good basis for treating more general problems as well.
