This paper discusses compressive strength of box section members with artificial uniform section loss portions. FE elasto-plastic analyses were conducted using solid element models for 112 cases with parameters of depth, area of section loss and slenderness ratio in order to clarify the effect of the section loss on the elasto-plastic behaviors/ultimate strength. As results, effects of section loss on the ultimate strength were numerically assessed and practical equations for estimating ultimate strength of box section members with uniform section loss were proposed.
