Author: Hendry, A W
First published: N/A
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Hendry, A W
RAPID design of multi-storey frames has received attention mainly as a result of new techniques, such as limit analysis, electronic and analogue computers, developments in nomography and so on. The elaborate results of present-day research apparently conflict with the stringent demands for rapid design, and it may be helpful in view of correspondence on a previous paper by the author to consider the basic factors that influence the formulation of rapid design methods.
FAILURE of a prestressed concrete beam in bending* is caused initially either by yielding of the steel near the bottom face (Primary tension failure), or by crushing of the concrete near the top face (Primary compression failure). Primary tension failures occur in beams with low steel ratios, whereas primary compression failures are to be expected in heavily reinforced beams; the two types of failure occur simultaneously for a certain limiting steel ratio r'o which depends on the properties of the two materials and the bond between them.
Professor Henry J. Cowan