Abstract
Usually, thin-walled open column sections have an intrinsic weakness in their low torsional strength, which is unpleasant for resistance of an open section. The distortion behaviour of cold-formed steel open section has a significant role in structural steel design. Hence, initiativeness is made for converting partially closed section by adding simple 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 analysis program CUFSM. The resistance and behaviour of the intermediate columns are examined in detail using finite element analysis software ANSYS. A good conformity between finite element analysis and experiments is found. The nominal design capacities are evaluated using the necessities of the direct strength method, North American iron and steel specification 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 carried out to inspect the effect of vitiations on thickness, depth, spacing and slenderness of spacer plates. The particulars of this study and results are offered in this research article.
Highlights
All over the world, applications of thin-walled sections have been a growing demand in all the engineering industry dueArab J Sci Eng (2016) 41:3865–3875 to their low self-weight, high performance of structural systems with uniform quality, simple fabrication process and cost-effective in both transport/erection
Distortional buckling occurs at intermediate column, and it is characterized by displacement of the element normal to the plane of the element
Dinis and his research team [11,12,13,14,15] conducted a series of studies on local–distortional–global interaction, post-buckling behaviour and interactive failure analysis in distortional buckling of cold-formed steel lipped channel column
Summary
Applications of thin-walled sections have been a growing demand in all the engineering industry due. The behaviour of the cold-formed steel column is generally improved by the presence of intermediate [1] and edge stiffeners [2]/stiffened element [3,4] or to make a closed profile [5]. Dinis and his research team [11,12,13,14,15] conducted a series of studies on local–distortional–global interaction, post-buckling behaviour and interactive failure analysis in distortional buckling of cold-formed steel lipped channel column. The authors gave the highly sensitive boundary conditions for the post-buckling collapse state Zhou and He [21] proposed a modified effective width formula for cold-formed steel column undergoing distortional buckling mode. A new idea for improving the distortional strength of intermediate thin-walled open column section has been proposed by several researchers [5].
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