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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.
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
Roger Evans has been Bridgemaster and Engineer for the Humber Bridge ‘one of the technically most perfect suspension bridges in the world’, for the past 7 years. Prior to that he was Deputy Bridgemaster for 12 years, having previously worked for contractors and more latterly as a bridge designer in local government.