The aim of the study is to investigate the distortional buckling behaviour of intermediate cold-formed lipped channel section under pinned end condition subjected to axial compression. An extensive test and numerical investigation of cold-formed lipped channel column with various types of intermediate web stiffeners is presented. In this study, three types of intermediate web stiffeners are chosen such as V, U and Σ. The entire cross-sectional dimensions meet with the pre-qualified column dimension given in Direct Strength Method for cold-formed steel structures. Totally, 12 columns are tested and results are compared with the numerical analysis. Numerical analysis is carried out using software ABAQUS. Material and geometric imperfections are incorporated in the FE model. Selected section dimensions met with the distortional buckling mode. Good correlation is achieved between experiment and finite element analysis. All the results are compared with the Direct Strength Method specifications for cold-formed steel structures. Based on the comparison of results, a suitable design modification is proposed. Furthermore, results are verified with the existing results which are available from the literature.
SRCFT columns are formed by inserting a steel section into a concrete-filled steel tube. These types of columns are named steel-reinforced concrete-filled steel tubular (SRCFT) columns. The current study aims at investigating the various types of reinforcing steel section to improve the strength and hysteresis behavior of SRCFT columns under axial and lateral cyclic loading. To attain this objective, a numerical study has been conducted on a series of composite columns. First, FEM procedure has been verified by the use of available experimental studies. Next, eight composite columns having different types of cross sections were analyzed. For comparison purpose, the base model was a CFT column used as a benchmark specimen. Nevertheless, the other specimens were SRCFT types. The results indicate that reinforcement of a CFT column through this method leads to enhancement in load-carrying capacity, enhancement in lateral drift ratio, ductility, preventing of local buckling in steel shell, and enhancement in energy absorption capacity. Under cyclic displacement history, it was observed that the use of cross-shaped reinforcing steel section causes a higher level of energy dissipation and the moment of inertia of the reinforcing steel sections was found to be the most significant parameter affecting the hysteresis behavior of SRCFT columns.
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