In the plastic design and anti-seismic design of steel structures, It is demanded that the component plates undergo large local deformations for the plastic hinge to develop and the load-carrying capability doesn’t decreasebecause of local buckling of the plates. Based on the basic principles and methods which are used to analyze the deformation capability and load-carrying capability of steel plates under normal temperature condition, the nonlinear finite element method was used to analyze the buckling behaviors of four-edge supported plates under uniform uniaxial compression and high temperature. The width-to-thickness ratio, constraint conditions of boundary and initial geometric imperfections were all considered. The relationships among the width-to-thickness ratio, deformation capability and the load-carrying capability were carefully studied. Furthermore, the formulas and the relationships among width-to-thickness ratio, deformation capability and load-carrying capability were also showed according to the parameter analysis, which can be used to evaluate the ductility of steel plates under high temperature.
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