The Structural Engineer > Archive > Volume 53 (1975) > Issues > Issue 6 > An Approximate Method for Calculating the Elastic Critical Loads of Multi-storey Plane Frames
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An Approximate Method for Calculating the Elastic Critical Loads of Multi-storey Plane Frames

The paper describes a method of estimating the elastic critical loads of multi-storey rigid frames unbraced against side-sway. A standard, linear elastic analysis is performed, choosing a defined loading pattern, and the critical load ratio is derived simply from the maximum sway index occurring in any of the storeys of the frame. The method gives estimates which are on the safe side, but always within 20 per cent of the correct result. This accuracy is shown to be sufficient for practical purposes. M.R. Horne

Author(s): Horne, M R

Keywords: approximate methods;multistorey buildings;plane frames;analysis;unbraced frames