Fire Safety Science Digital Archive

The behavior of the fire exposed steel deck composite floor slab is complicated, particularly the first 15 minutes of fire exposure*). The difficulty of the step by step calculus from the fire start arises in this time zone. But the required estimation is for the 1 or 2 hours after fire start, then the behavior of the steel deck composite floor slab becomes stable, and it becomes possible to calculate the stress and deflection with the aid of the section properties of the effective section (as shown in the references 1) to 5), for the up and downward bending and by setting up the stress deflection formula considered up and downward bending zone. In this paper, the author develops a practical calculation method for the estimation of deflection and ultimate strength of the fire exposed steel deck composite floor slab by this means, and verifies the validity of this method by comparing to experimental results.