Experimental and numerical study on flexural behaviour of cold-formed steel hat-shaped beams with geometrical imperfections

摘要

? 2023 Elsevier LtdExperimental and numerical studies are conducted to investigate cold-formed hat-shaped members' flexural behaviour and determine the effects of different parameters on the behaviour. A total of ten specimens of cold-formed hat-shaped beams with different lengths are chosen for physical tests. The actual geometry and geometric imperfection distributions are acquired by processing 3D point clouds obtained by laser scanners. Four-point bending tests are performed to obtain benchmark results for numerical models. It is observed that numerical results are in accordance with the experimental results with high accuracy. Once the generated finite element models are calibrated based on the experiment results, a parametric study investigating the influence of the length, thickness, lip width, return length, radius, and lip angle on the beam behaviour is undertaken. In addition, the effect of geometric imperfection magnitude selection and imperfection modelling method on the member capacity is considered. The study's outcomes show that the initial geometric imperfections and input parameters selected for the generated numerical models significantly affect the flexural behaviour of CFS hat-shaped beams.