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Model answer

Letters

The Millennium bridge wobble seems to have taken Ove Arup by surprise yet I cannot imagine why they went ahead with the construction of the bridge without first making a model.

This model would have demonstrated the lack of torsional stability which follows when torsion resisting bracing in full measure is not provided.

Perhaps before spending £5M on a design which incoprorates dangling lumps of steel, a simple model fitted with proper full length bracing would point the way to a practical solution which would look better for considerably less cost.

Allan Beckett, Beckett Rankine Partnership, 270 Vauxhall Bridge Road, London SW1V 1BB

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