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The £650 million retrofitting programme for California's freeways which started after the Loma Prieta earthquake in 1989 proved its worth.All retrofitted bridges withstood the quake.But it was a different story for bridges strengthened under the 1971 retrofitting scheme.John Scales, structures supervising engineer with Parsons Brinckerhoff, said he was unaware of any damage to the 114 bridges retrofitted after Loma Prieta. But he said 400 bridges still needed strengthening.He said: ...

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