Abstract
The behavior of the fire exposed steel deck comoposite floor slab is complicated, particularly the first 15 minutes of fire exposure1). 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 upand downward bending and by setting up the stress deflection formula considered upand downward bendlng zone. In h s 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.
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