The fire resistant behavior of web-slotted cold-formed channel columns with non-uniform temperature distributions was investigated extensively by use of the finite element method in this article. The failure mode of the web-slotted column with non-uniform temperature distributions is very complex with the interaction of the local buckling, the distortional buckling and the global flexural buckling. The ultimate strengths of members with non-uniform temperature distributions are higher than that with uniform temperature distributions of the same highest temperature. In addition the analysis results indicate that the degradation of the material strength makes the dominating factor influencing the fire resistance of cold-formed members. The simplified approach was proposed for the practical design of web-slotted cold-formed columns at high temperatures.
BUCKLING STRENGTH AND BEHAVIOR OF ELASTIC LOCAL BUCKLING FOR COLD-FORMED CHANNEL MEMBER UNDER COMPRESSION
