Abstract
This article deals with the overall structural stability of sandwich panels used as ceilings and fire walls when exposed to fire on one side. Only panels with flat steel faces are considered. Simple mechanisms of instability are described, load actions are quantified, and practical design guidance is given to ensure stability i.e., resistance to overall collapse. The analysis for ceilings assumes that, after delamination of the fire exposed steel face due to softening of the adhesive, the panel faces act as catenaries, and calculations are made of mid-span deflection and the catenary force needed to resist collapse. This method is being considered in the work of European committee CEN TC 127 with regard to the development of rules for extended applications for construction products. The analysis for internal fire walls takes account of wind pressure. The importance of achieving adequate panel-end restraint is demonstrated.
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