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302 Example of small temporary stage structure
Report ID: 302
Report Overview
This is an example of a small stage that is potentially unstable.
Report Content
This is a small stage that is potentially unstable. 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.
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Potentially unstable temporary stage
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A tragic example of the collapse of a stage was at the Indiana State Fair in 2011. See SCOSS Alert on Temporary Stage Structures.
Information on all aspects of temporary structues can be found in the IStructE publication Temporary demountable structures: guidance on procurement, design and use (fourth edition).