ELASTIC BUCKLING OF COLD-FORMED STEEL COMPLEX CROSS SECTIONS USING CONSTRAINED SPLINE FINITE STRIP METHOD (CSFSM)
Ajeesh S S 1*, and Arul Jayachandran S 2
1 Vellore Institute of Technology, Vellore, India
2 Indian Institute of Technology Madras, Chennai, India
This paper presents the application of constrained spline finite strip method (cSFSM) for cold-formed steel members with complex edge stiffeners. In this method, the principles of GBT are used to develop restraint matrices corresponding to local, distortional and global buckling. These matrices are applied in generalized eigen value equation by using transformation technique. The critical buckling stresses were calculated separately for pure local, distortional and global buckling. Based on the formulation, cross sectional geometries having complex lips are analysed to study the variations in buckling stresses developed. The increase in complexity of lip stiffeners increases the local buckling capacity of the cross section. However, for distortional buckling, the cross sections with inward lip stiffener offer higher buckling capacity than those with outward lips. The influence of lip stiffeners on global buckling was observed to be marginal from the present study.
Cold-formed steel; Spline finite strip method; Generalized beam theory; Buckling; Mode decomposition