| In this thesis, the FEM model of biaxial bending of tapered I-section beam-columns with slender web which consider the interactive buckling is built for the geometrically nonlinear and materially nonlinear analysis. In order to simulate the practical situation, the imperfection of the members and the residual stresses are considered. And parametric analysis of the member is carried out and FEM results of ultimate load-carrying capacity will be obtained by changing parameters, including web plate width-thickness ratio, slenderness ratio of column, tapering ratio and residual stress etc... The influence of these parameters to the elastic-plastic stability carrying capacity is researched.According to GB50017-2003 and CECS 102 : 2002, two methods which are used to calculate the stability carrying capacity of biaxial bending of tapered I-section beam-columns with slender web are proposed. The results are compared with those of FEM. It indicates that the results of the methods are safe in the common situation and unsafe in the exceptional cases.
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