Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Knowledge bank

READER'S WRITE

Surely mine were not the only eyebrows to elevate on reading the latest Fitzpatrick and colleagues' comment on the wobbly bridge (NCE 7 June).

They maintain that 'the sway problem on the Millennium Bridge had nothing to do with the crossing's ground breaking design'.

However, their comments appear to contradict this statement by blaming a combination of pedestrian density and a lateral frequency below 1.3Hz. Problems that followed were then attributed to a lack of knowledge of this damaging lateral excitation during the design period.

To its credit, Arup has initiated research and synchronous lateral excitation is now better understood and will no doubt generate future guidelines. But as I pointed out at the ICE Millennium Bridge meeting on 26 April, the International Association for Bridge & Structural Engineering's (IABSE) 1987 book Vibrations in Structures covers this form of vibration.

The apparent lesson is that designers, particularly those involved with innovative structures, need readily available information on all previously recorded structural failures. With modern technology, this would seem entirely realisable.

Brian Pritchard (F), Member of Executive Committee, IABSE British Group, Lindfield, West Sussex

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.