Experiments and numerical modelling of cold-formed steel beams under bending and torsion

Cold-formed steel C- and Z-section beams are widely used in light gauge building systems as flexural members. In their applications members, mono-symmetric C-sections point-symmetric Z-sections often subjected to transverse loads eccentric the shear centre, leading combined bending torsion actions. However, research design methods for cold-formed limited. Hence this has investigated structural behaviour, strength of under action torsion. Twenty-four tests were conducted on simply-supported a mid-span load. Two two with different spans, each three loading-eccentricities. A special test set-up was developed simulate loading-eccentricities provide accurate boundary conditions. Numerical models tested then using ANSYS nonlinear finite element analyses including effects large deformation material yielding performed. The numerical results agreed well terms ultimate strengths, failures modes load-displacement curves. Finally from compared predictions current equation This paper presents investigation torsion, results.