By F. H. FRANKLAND
(American Institute of Steel Construction)
In October, 1936, the Structural Division of the American Society of Civil Engineers held an important and significant meeting at Pittsburgh, Pa. At this meeting numerous authoritative papers were presented, all with reference to the structural application of steel and light-weight alloys, the subjects covered being Modern Stress Theories, Metallurgical and Manufacturing Aspects, Structural Applications of Special Steels, and Light-Weight Structural Design.1
Since that time, seven years ago, important and significant developments have taken place, not only in the techniques of materials production, but also in the application of design conceptions and improved fabricating methods.
In the past few years the theoretical bases of structural engineering have changed but slowly, due to the great extent to which they had become standardized. Structural engineers used ordinary carbon steels and there was no particular need of refinement in material or in design methods. There has recently been a marked change in conditions, thus calling for a critical survey of the situa-____________________