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Stones' vibes not as big as Springsteen's

News :

THE ROLLING Stones may only rock and roll but dancing in the dark to Bruce Springsteen could lead to excessive vibration, an Arup seminar heard last week.

Arup advanced technology director Michael Willford said that Springsteen's particular brand of rock music created excessive structural movement at a recent concert in Sweden while an earlier gig at the same stadium by rock legends the Rolling Stones showed up no undue movement.

Willford said that the repetitive beat created by crowd movement of a specific frequency during Springsteen's performance led to this structural instability.

Despite typically exuberant strutting and cajoling, the Rolling Stones failed to produce the same effect.

In his paper Risk-based approaches to crowd occupancy structures, Willford detailed a method for predicting the loading frequencies from particular kinds of music. He believes this method can provide a valuable tool for stadia management, assessing the risk of 'excessive vibration for specific events at specific venues'.

Withdrawing the crowd from the first few rows of a cantilever for certain performers would significantly reduce the applied frequency to the structure, he said.

INFOPLUS www. vibration. shef. ac. uk

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