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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.
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
Professor M. R. Horne (F) : Dr. Wood has rendered an enormous service to structural engineers by the publication of this paper. The concept of effective length has been too loose a one as far as most engineers are concerned, and Dr. Wood has shown how powerful and exact a tool it can become. Its use is crucial for the design of column in no-sway frames, and its accurate exploitation for such frames, as opposed to its hitherto empirical application, must surely form the basis for any future design procedures.