Stability Test on Double-Limb Cold-Formed C-Shaped Steel Yurt Rigid Frames

Based on the study of cold-formed steel yurts in grassland areas, a one-bay planar rigid frame was used as the research object. Stability tests and finite element simulations were carried out on a 5-bay rigid frame to analyze its damage modalities, bearing capacity, column top lateral displacement and yielding mechanism, etc., and to investigate the effects of inclined beam slope and depth-span ratio on the stability of the rigid frame. The results showed that the damage of rigid frame was mainly caused by the local buckling of C-beam at the top and bottom of the beam, which led to the overall in-plane instability; increasing the slope of inclined beam and decreasing the depth-span ratio could advance the bearing capacity and the overall stability of rigid frame; the lateral shift of the top of rigid frame column increased with the raise of slope of slanted beam, but the depth-span ratio had less effect on the lateral shift of the top of column; the increase of slope of inclined beam and depth-span ratio would advance the buckling damage of the top of rigid frame column and change the overall damage modality of rigid frame; the design should consider the influence of slope of inclined beam on column top lateral shift and bearing capacity, and increase the rigidity of rigid hing column reasonably to prevent the column top lateral shift from causing the instability of rigid frame;comparison and cross-validation between finite elements and tests were used to provide a reference for further research into such structures.