Traditionally, the fire resistance of a steel column is obtained through a standard fire resistance test conducted on a simply supported compressive specimen subjected to the standard fire exposure, such as ISO834
. Although the standard fire resistance test is a convenient way for grading the relative fire performance of different types of structural members, for a number of reasons it is not very effective in developing our understanding of realistic structural behavior in a fire. An important shortcoming is that standard fire resistance tests are carried out on the individual structural member, not on a complete structure. Therefore, structural interactions cannot be assessed. The Broadgate fire
and the series of Cardington fire tests and the following theoretical analysis
have all shown that strong interactions exist among slabs, columns and beams. An effective way of studying structural interactions in a fire is to perform fire tests on restrained steel members.