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The large scale examination of structural safety has received an appreciable momentum since the end of the last war. During the course of such study, it was confirmed that according to the current convention a design can be made after a vigorous analysis based on well founded theories, yet the so called ‘ safety ’ of such a design is still an enigma ; and the ‘ safety ’ of its constituent members is neither uniform nor discernible. It is evident that the link between the analysis and the design, both of which are major components of design philosophy, is too weak.
In the new Report on the Structural Use of Aluminium, which will be published in the near future by the Institution and which will supersede the 1950 report, recommendations are given for arriving at safe stresses in the principal types of structural members. This paper summarises the background of knowledge that has led up to the clauses dealing with struts. The three basic modes of failure (column, torsional and local buckling) are studied, and simplified procedures are presented for
application to some of the more standard shapes of section.
J. B. Dwight
The reinforced concrete spiral staircase is being increasingly used nowadays, usually as an alternative to the external steel fire-escape, which can rarely be said to improve the appearance of a building. With skilful architectural treatment a spiral staircase can be a striking and attractive feature.
D. E. Ryder