Simple design methods are available for the design of composite beams, columns, and floor slabs. Due to the need to define the high thermal gradients through the concrete, induced thermal stresses within the concrete, and the interface behaviour between the steel and concrete, most methods are only applicable for the standard time-temperature fire scenario.

Simple tables are presented in codes and design guides for various forms of composite members. In some cases these tables take into account varying structural performance by including the actual estimated load on the member at the fire limit state. However, irrespective of whether actual load levels are considered or ignored, the tables are only applicable if the standard time-temperature relationship is used.

A simple design method for steel beams supporting a composite floor slab has been developed following the Cardington fire tests. The method is based on fundamental engineering principles and is valid for any fire scenario.

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