Fire resistance of thin-walled steel channel column and parameter analysis

This paper presents a new design method for thin-wall hot-rolled channel columns in fire condition using Rankine formula. The finite element method (FEM) analysis is to validate the new proposed method. The analytical results are reasonably accurate, as comparing to those of finite element simulation. Some effects of parameters on fire resistance are investigated. The results show that the slenderness ratio is the main factor, which affects the fire resistance of thin-walled channel column, its crease can diminishes the load bearing capacity in fire condition; the critical slenderness ratio, at which the elastic flexural-torsional buckling is transferred to elastic flexural buckling can not be changed by elevated temperature; with almost the same cross-section areas, the hot-rolled thin-walled channel section with wide flange and shallow web can get small torsional parameter K but high load ratio and great fire resistant capacity.