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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.
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.
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.