Design formulas for biaxially loaded thin-walled steel box columns

Abstract

Simplified design equations for predicting the ultimate load capacity of thin-plated steel box columns under combined action of axial stress and biaxial end moments is proposed. These equations allow for local buckling of component plates and different levels of welding residual stresses. Results using the proposed design equations are compared with those computed by numerical procedure for columns having different loading conditions and various column and plate parameters. The limitations of the design equations are discussed and their accuracy is examined. Comparisons between the predicted and experimental results are made.