편심압축하중을 받는 박판 정사각튜브의 붕괴거동(II)

The collapse behavior of a thin-walled square tube under eccentric compressive load is investigated in this study. A thin-walled tube under the load is controlled by local buckling or yielding of material according to the ratio of thickness to width (t／b) of the cross section, and subsequent collapse of the section. This relationship can be divided into three regions: elastic, post-buckling and crippling. In this study, the load-displacement relationship is theoretically presented in each region by introducing the stress distribution of the cross section in the loading process and the geometrical hinge collapse mechanism in the unloading process. And the maximum load carrying capacity is derived in the closed form as a function of normal stress on the flange plate.