摘要：Under fire conditions, cold-formed steel loses its strength faster than hot-rolled steel. This is due to enhancement in the strength of cold-formed steel at ambient temperature, but this enhancement diminishing at high temperatures. The loss of strength in cold-formed steel may be 20% higher by comparison with hot-rolled steel. Hot-rolled steel members are generally thick and fail either by local or global buckling (e.g. flexural buckling in column and lateral torsional buckling in beams). In comparison, cold-formed thin-walled members are more prone to local buckling and distortional buckling. With regard to global buckling, thin-walled columns can fail in combined local buckling, distortional buckling with torsional or torsional-flexural buckling, in addition to flexural buckling.
