FIRE RESISTANCE PERFORMANCE ANALYSIS OF H-SECTION STAINLESS STEEL COLUMN UNDER AXIAL COMPRESSION

Based on Austenitic stainless steel material S30408, numerical simulation analysis is performed on H-section stainless steel column in fire under axial compression by steady state and transient state analysis method. Mechanical performance and failure mode of stainless steel column are revealed in this paper. Load-displacement curves and ultimate bearing capacity-temperature curves are plotted through steady state analysis method. The temperature development of column and critical temperature of column under specific load are obtained through transient state analysis. The analysis results of the two methods are compared with Eurocode (EN1993-1-2). Parametric analysis is performed by steady state analysis and transient state analysis to study the fire resistance performance of stainless steel column. The influences of the initial imperfection, load ratio, section size and slenderness ratio on the ultimate bearing capacity at elevated temperature and the critical temperatures are investigated. The results show that the slenderness ratio and section size are the main influence factors on the ultimate bearing capacity of stainless steel column at elevated temperature, and the load ratio is the key factor of critical temperature of column, while the effect of initial imperfection on the fire resistance performance of column is not obvious.