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The shear lag phenomenon in steel box girder bridges is studied by means of the finite element method of analysis. Some of the results of this study provided background for the preparation of the Merrison shear lag rules, and the rules are discussed in the light of these results. Suggestions are then made on how the rules could be simplified for inclusion in a Code of Practice.
K.R. Moffatt and P.J. Dowling
History and its lessons
Despite the interesting history of building control going back at least 800 years, I doubt whether it has much relevance in projecting the future. In this instance history merely explains evolution which has resulted in present-day procedure, but I do not think this understanding assists us in devising a system for the future.
August 1974 saw the installation of the largest steel offshore structure built to date--'Highland One'. The paper describes the fabrication and construction of this structure and highlights the problems encountered.
L.W. Harrington, T.E. Kolz, J.Q. Rahtz and D. Tees