Techno Press

Steel and Composite Structures   Volume 23, Number 3, February28 2017, pages 331-338
Distortional buckling of cold-formed lipped channel columns subjected to axial compression
Wangbao Zhou and Lizhong Jiang

Abstract     [Full Text]
    Cold-formed lipped channel columns (CFLCCs) have been widely used in light gauge steel constructions. The distortional buckling is one of the important buckling modes for CFLCCs and the distortional buckling critical load depends significantly on the rotational restrain stiffness generated by the web to the lipped flange. First, a simplified explicit expression for the rotational restraint stiffness of the lipped flange has been derived. Using the expression, the characteristics of the rotational restraint stiffness of the lipped flange have been investigated. The results show that there is a linear coupling relationship between the applied forces and the rotational restraint stiffness of the lipped flange. Based on the explicit expression of the rotational restraint stiffness of the lipped flange, a simplified analytical formula has been derived which can determine the elastic distortional buckling critical stress of the CFLCCs subjected to axial compression. The simplified analytical formula developed in this study has been shown to be accurate through the comparisons with results from the distortional buckling analyses using the ANSYS finite element software. The developed analytical formula is easy to apply, and can be used directly in practical design and incorporated into future design codes and guidelines.
Key Words
    cold-formed steel; lipped channel sections; rotational restraint stiffness; distortional buckling; axial compression
(1) School of Civil Engineering, Central South University, Changsha 410075, China;
(2) National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China.

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