Buckling of thin-walled girders under compound load

A theoretical study of the local buckling kof thin-walled girders with closed polygonal cross-sections is presented. The load of the girder consists of compression, asymmetrical bending and shear. The parabolic distribution of shear stresses in webs is included in the theoretical considerations. The energy method is employed and sine and polynomial series are applied to describe the deflections of any wall. A sample of the results of numerical calculations is presented for a girder with rectangular cross-section subjected to bending and shear. Some results for a girder under asymmetrical bending are also included.