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Bridge crossed

Letters

The feature on Taney Bridge (NCE 21 February) was accurate; however the accompanying news story appears to be spinning the wobbly bridge story a little too far.

Neither the bridges engineer or ourselves, the designer of the alternative, were unduly concerned about lateral excitation of the bridge deck, the problem with London's wobbly bridge. The concern was only with the vibration of the cables themselves, a well known but difficult to predict phenomena. All 26 stays in the main span have provision for cable dampers.

David Collings (F), technical director, Benaim, david. collings@benaimgroup.com

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