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Mr. D. J. Lee (F): I am going to raise a query on the shape of the river crossing and relate this to cantilever bridges in general. One can plot span against the span/
rise ratio for various bridges as shown in the diagram, Fig Dl. The upper band noted as typical prestressed concrete cantilever zone is placed arbitrarily to include several international and European examples of various spans, including the largest cantilever span, Bendorf, point 5. The Bettingen Bridge, point 3, has a span that is pretty well identical to the Kingston Bridge(point 1). Point 2 is the Medway Bridge. It will be seen that these two bridges are rather curiously located half-way between the cantilever zone and the concrete arch zone. Although one would not expect the two zones to have constant S/R values for any span, i.e. one would expect slightly lower S/R values the larger the span, nevertheless the trend as based on existing cases is interesting and I would welcome the authors’ comments.
Professor A. Bolton (M) was educated at Queen Elizabeth's Grammar School, Blackburn, and the University of Manchester. His first degree was in building but his subsequent degrees were concerned with structural engineering.
This paper presents a basis for determining displacements and stresses arising from the torsion of structural rectangular hollow sections. Particular attention is given to
stress concentrations at the re-entrant corners. A relationship is determined between freely formed corner radii and section thickness. Analytical solutions are compared with experimental results on steel sections and prediction from thin walled torsion theory.