Theoretical analysis and evaluation for cupled buckling strength of h-shaped beams under bending shear

Buckling behaviors of open section steel members are generally divided into two styles which called local buckling and overall buckling depending on the assumption of boundary condition. However, local buckling and overall buckling may happen at the same time when thin plates arc widely used in steel structures, and somewhat overestimation will cause without considering the interaction of each other. As the results shown in the previous studies, buckling behavior may be dominated by coupled buckling. Therefore, it is important to solve this problem by theoretical method especially for seismic design. This paper uses an energy method of analysis to study coupled buckling of H-shaped beams under bending shear. Moreover, on the basis of the theoretical analysis results, the evaluation of coupled buckling strength is proposed by using parameter of geometrical shape of H-shaped member.