Behaviour of Partially Closed Stiffened Cold-Formed Steel Compression Member

摘要

Usually, thin-walled open column sections have anintrinsicweaknessintheirlowtorsionalstrength,whichis unpleasant for resistance of an open section. The distortion behaviour of cold-formed steel open section has a signifi- cant role in structural steel design. Hence, initiativeness is made for converting partially closed section by adding sim- ple spacer plates connected with self-tapping screws. The intend of this work is tested to estimate the competence of this solution by comparing the strength and performance of partially closed and open stiffened complex channel section under axial compression. The buckling characteristics of the section are computed using the linear elastic buckling analy- sis program CUFSM. The resistance and behaviour of the intermediate columns are examined in detail using finite ele- mentanalysissoftwareANSYS.Agoodconformitybetween finite element analysis and experiments is found. The nomi- naldesigncapacitiesareevaluatedusingthenecessitiesofthe direct strength method, North American iron and steel spec- ification and Indian standard and are compared with those from test and finite element analysis. After this verification of the numerical model, a crucial parametric study is car- riedouttoinspecttheeffectofvitiationsonthickness,depth, spacing and slenderness of spacer plates. The particulars of this study and results are offered in this research article.