| Fire behavior of steel frame in diffrentent elevated temperatue conditions was simulated by finite element method (Abbreviated as FEM) software ANSYS. Perpoetines of geometric, material and contact non-linear were taken into account. The finite element models were validated by tests results. The influences of elevated temperatue conditions on failure modes and distortion were investigated by finite element analysis and theory of elasticity and plasticity. The suggestions that benefit for design were proposed. The following contents were studied in this paper.1. The affect to fire resistance capacity of four-face heating H-section steel colum under different elevated temprature conditions was analyzed using FEM.Take an eigenvalue buckling analysis to H-section steel column to determine its instability style. Then take a nonlinear buckling calculation, based on the eigenvalue buckling analysis, which considered the effects of initial imperfection and more accurately reflected the performance of column on fire; studied effect of different elevated temperature conditions on fire resistance performance of H-section column.The results show that temperature condition did not affect the buckling mode of the four-face heating steel columns, but it has influences on the mid-span deflection and axial displacement.2. Analyse the effect of elevated temperature conditions on fire behavior of steel frameBehavior of steel frame in diffrentent elevated temperature conditions was analysed using FEM. Compared the differents of the failure modes of steel frame, the mid-span deflection of beams and the vertical deformation and lateral deformation of columns, as well as deformation of the concrete slab in different elevated temperature conditions.The results show that temperature condition did not affect the buckling mode of the steel frame, but it has influences on the mid-span deflection of beams vertical and lateral deformations of column, as well as deformation of the concrete slab.
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