Elastic buckling strength of H-shaped beams with continuous complete restraint on upper flange

This study aims to develop approximate formulas to calculate the elastic buckling strength of H-shaped beams with continuous complete restraint on the upper flange by theoretical analysis, and to examine the coupled effect between plate local buckling and lateral buckling under restraint. As a result, the following conclusions are reached: (1) The elastic lateral buckling strength of H-shaped beams with continuous complete restraint on the upper flange is expressed by the equation proposed in this study. (2) The effect of continuous restraint to plate local buckling strength is little. (3) Continuous restraint on the upper flange increases lateral buckling strength but the coupled effect between plate local buckling and lateral buckling under restraint can decrease buckling strength.