These are short abstracts of the material printed in our journal which is published twice annually. The Journal covers items of interest to structural engineers, including but not limited to: technical papers, project reports, materials information, code reviews.
Journal: Vol 15 No. 1 2002
The Challenge of Grade 500 Steel Vol 15 No 1 2002
Carl R. O'Grady
With the introduction of Grade 500 steel, it would not be unreasonable to pre-suppose that, before embarking on this major change, some actual bond testing had been carried out, to determine adequate lap lengths. It would seem an ideal opportunity, to compare the results of actual tests, with existing code formulas, using realistically higher strength concrete, to compliment the higher strength re-bars. The relevance of need for such tests is augmented by the concurrent change in bar
It is also imperative, that the whole question of beam/ column joint design be re-addressed, as this area, presently, is problematical, not only to the designer, but, even more importantly, to the builder, as the steel congestion militates against the ease of concrete placement. Obviously, with the introduction of higher strength reinforcing steel, the present problems can only get worse. Will over strength factors increase? Unless these problems are immediately addressed by a realistic testing program, the economic viability of reinforced concrete will suffer, in relation to other forms of construction. Surely, this should be of paramount concern to the industry!
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