抄録
Regarding bending buckling of box beams which have the rectangular cross-section with four thin plates, we try to derive the buckling stress based on the energy method. Box beams of the main target are with the aspect ratio of cross-section accompanied with compression buckling in the compressed plate. It is supposed that the buckling occurs only at the compression side and forced displacement at two adjacent plates is induced by the compression buckling. The accuracy of the derived equation is verified by the comparison with the results of buckling eigenvalue analysis using Finite Element Method (FEM). The derived buckling stresses correspond to results by FEM, although somewhat error exists near the critical aspect ratio of the cross-section.
