Abstract
This paper presented the analytical method for understanding the mechanical behavior of the plate elements composing steel structural members under fire conditions. The characteristics at high temperature were introduced into the stiffness matrix and nodal forces in the analytical method at normal temperature based on the finite element method by using the models as a function of temperature or time. The validity of the analytical method was examined by the accuracy of the traces to the material characteristic models and by the experimental results. Consequently it was shown that the analytical method can pursue the real behavior under fire conditions.
