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CROSS Safety Report

Example of small temporary stage structure

Report ID: 302 Published: 1 January 2013 Region: CROSS-UK

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Overview

This is an example of a small stage that is potentially unstable.

Key Learning Outcomes

For event organisers and construction professionals:

  • Be aware that the design and installation of temporary structures should be given the same degree of attention as primary structures to ensure they are safe

  • It is good practice to carry out independent design checks on temporary structures. A Chartered Engineer having adequate skill and experience can carry out these checks.

  • Carrying out independent erection checks by a person who is competent to do so, can ensure that the temporary structure is built in accordance with the design

For civil and structural design engineers:

  • Careful consideration needs to be given to temporary structures to ensure they have adequate lateral stability to resist wind loads
  • Helpful guidance is provided in the Standing Committee on Structural Safety (SCOSS) Alert on Temporary Stage Structures
  • Information on all aspects of temporary structures can be found in the Institution of Structural Engineers publication Temporary demountable structures  

Full Report

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This is a small stage that is potentially unstable (Figure 1). All the mass is at roof level with the self weight of the roof, speakers, lights, and sheeting. There is apparently no bracing and the vertical supports are scaffold poles. In seismic terms this is an inverted pendulum. Lateral loading from wind or eccentricities from the way the structure has been assembled could result in failure.

Image
Figure 1: Potentially unstable temporary stage

Expert Panel Comments

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A tragic example of the collapse of a stage was at the Indiana State Fair in 2011. See the Standing Committee on Structural Safety (SCOSS) Alert on Temporary Stage Structures.

Information on all aspects of temporary structures can be found in the Institution of Structural Engineers publication Temporary demountable structures.  

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