Abstract
The ultimate bearing capacity of thin-walled rectangular-section columns (which is welded by channel section steel plate) using 18Mn2CrMoBA high strength steel in bending and axial compression was studied by finite element method. The influence of slenderness ratio, flange width-thickness ratio and section side ratio on the ultimate bearing capacity of member was studied. The calculation method for ultimate bearing capacity of member was proposed on the basis of previous study (which can be found reference document) and many numerical calculation results. Results show that the moment-compression interactive curve changes downward concave from upward bulge with the increasing of slenderness ratio, the ultimate bearing capacity was reduced with the flange width-to-thickness ratio and section side ratio increased, the effects of these parameters were interactive. The proposed calculation formula is in good agreement with the finite element numerical results.
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