Disadvantages: 1. Although there is no thermal plastic compression during the forming process, there are still residual stresses in the section, which will inevitably affect the overall and local buckling characteristics of the steel; 2. The style of cold-rolled steel is generally an open section, which makes the section free Lower torsional rigidity. It is prone to torsion when it is bent, and it is prone to bending and torsional buckling when it is compressed, and its torsional performance is poor; 3. The wall thickness of cold-rolled formed steel is small, and there is no thickening at the corner of the plate connection, which can withstand local stress The ability to concentrate loads is weak.