Steel plate girders with trapezoidal corrugated webs have been used widely over the last years around the world in many roadways and railway steel bridges as they can introduce several important advantages compared with plate girders bridges with the flat web. The study in this paper presents a numerical investigation of flange buckling behavior using the FE program ABAQUS and study the effect of slenderness ratio of the flange and corrugated web on the bending moment strength and the flexural behavior of trapezoidal corrugated web steel plate girders built-up from high-strength steel (HSSs). Firstly, the linear buckling analysis has been carried out to obtain the local flange buckling coefficient, then the ultimate strength of bending moment has been obtained from the nonlinear buckling analysis. Finally, some recommendation has been listed to help structural engineers to design corrugated web bridge girders efficiently.