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CROSS Safety Report

Grandstands and dynamic crowd loads

Report ID: 1 Published: 1 November 2005 Region: CROSS-UK

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A cantilever football stand vibrated when fans jumped in a synchronised manner and modifications had to be carried out to raise the natural frequency of the structure.

Key Learning Outcomes

For civil and structural design engineers:

  • Careful consideration should be given to the dynamic response of grandstands to dynamic crowd loads

Full Report

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One report was of a cantilever football stand vibrating when fans jumped in a synchronised manner. The risk of panic amongst the fans or of collapse was clearly unacceptable. Modifications were carried out to raise the natural frequency of the structure.

Expert Panel Comments

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Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.

This is a well documented issue but the message is worth repeating that appropriate knowledge of dynamics is still not widespread enough.

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