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Post-tensioned concrete bridges have been in use since the late 1950s. This type of design was thought to bring with it the benefits of structures larger and more slender than had been possible by conventional design up to this time. It was not until the mid 1960s that the first signs of problems in this type of structure first showed up.
Mr B. Bouhon/Mr E. Alexandre
The idea of using steel fibres to reinforce concrete (in particular, industrial concrete floors) was conceived some 30 years ago. Gradually, the idea progressed to applications on a larger scale.
The situations where the shear connection in a composite beam of steel and concrete can be subjected to concentrations of shear flow are listed and discussed. An account is given of relevant finite element (FE) analyses. The design rules given in the draft Eurocode fpr composite bridges, ENV 1994: 2, for shear connection near anchorages of Prestressing tendons, or at nodes in composite trusses, are shown to be radical simplifications of the results of these analyses. Reference is made also to similar situations, such as sudden changes of section, and shear connection in bowstring arches.
Professor R.P. Johnson and R.I. Ivanov