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The Structural Engineer

Mr B. Bouhon/Mr E. Alexandre (Silidur Group) 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.

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The Structural Engineer

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. T.J. Lee

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Author – Lee, T J

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The Structural Engineer

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. Kathy Stansfield

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The Structural Engineer

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

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The Structural Engineer

I described site silane problems in 1997 and, since specifiers continue to invoke this expensive treatment, I thought it time to write a critique based on Second Severn Crossing (SSC) and other site experience. Dr Maurice Levitt

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Author – Levitt, Maurice

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The Structural Engineer

Aspects of Safety David Quinion writes from Salisbury, adding to previous comments, most recently on 2 January, 2001: That accident statistics on construction sites continue to be higher than in most other industries is hardly surprising to engineers who also construct such other workplaces. The working conditions on a construction site constantly change, are inherently dangerous and require constant alertness. As a contractor’s engineer, having spent many years contributing to guidance documents for safe construction, practices I offer these observations.

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