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Professor GEORGE WINTER, of Cornell University, New York, writes : In April, 1946, the American Iron and Steel Institute published the first American Specification for the Design of Light Gauge Steel Structural Members, which is nationally recognised in the United States as the governing code for cold formed structural sections. During the five years of its existence hundreds of millions of square feet of light gauge steel roof deck, wall and floor panels, and many thousands of tons of cold formed steel framing have been erected to this specification. The research work which resulted in this code has been carried out continuously since 1939 at Cornell University under the writer’s direction, and is still in progress. A second, greatly expanded edition of the specification is now in preparation.
For this reason the writer was greatly interested
In an earlier paper the authors described tests which they had carried out on a welded mild-steel plate girder, the overall dimensions of which were 20 ft. 9 in. long by
3 ft. 1 1/4 in. deep. This was a quarter-scale model of 12 ft. deep crane runway girders for the new Margam Steel plant at South Wales, and formed part of an investigation into the stress distribution in mild steel plate girders involving three further girders of similar size which have since been tested; two of welded and one of riveted construction.
S. Mackey and D.M. Brotton
Mr J. M. Mawditt (M): The paper is to be commended for simplifying the design procedure associated with the use of the material stress -strain curves as required by clause 188.8.131.52. of CP 110.