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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
Mr. Gordon Rose's dilemma in establishing the capacity of load-bearing walls of old buildings to the satisfaction of Authority (April) has drawn further comment; Mr. Stephen Revesz (F) considers it is timely to air this issue and offers practical, commonsense suggestions drawn from experience. He writes: We have had to deal with similar problems when converting existing buildings. In most cases the floors were found to be just adequate for domestic loading (1.5 kN/m2) but had been in use as offices for a considerable number of years. The owners had controlled storage of papers or office machinery to avoid overloading by commonsense. Verulam
Soon British reinforced brickwork design will shift from a permissible stress approach to a limit state approach similar to that already accomplished for reinforced concrete. For the limit state shear design of reinforced brickwork beams, ultimate shear stress values must be defined as a function of the main shear parameters. The main parameters, similar to the case of reinforced concrete beams, were assumed to be the ratio of shear span to effective depth a/d, and the percentage of tensile reinforcement p. Since a review of published evidence provided little systematic data on the influence of a/d and p on reinforced brickwork strength, the authors carried out a systematic experimental investigation involving a/d and p. Results indicate a significant increase in ultimate shear stress with decreasing a/d values similar to the case of reinforced concrete beams, but, in contrast to the case of reinforced concrete beams, a virtual independence of p on ultimate shear stress. G.T. Suter and A.W. Hendry