TY - JOUR
T1 - Fire resistance study of axially loaded high strength steel columns
AU - Wang, Weiyong
AU - Ohmiya, Yoshifumi
AU - Ma, Gaofeng
N1 - Funding Information:
The authors wish to acknowledge the support of Chongqing Postdoctoral Science special Foundation (xm201103007) and China Natural Science Foundation (51008320).
PY - 2013
Y1 - 2013
N2 - In this paper, an analytical method was presented to investigate the fire resistance of axially loaded high strength steel columns. By introducing the mechanical properties of high strength steel at elevated temperature, the critical stress and critical temperature of high strength steel columns subjected to axial compression, and the width-to-thickness ratio for the flange and the web at elevated temperature are deduced, based on the stability theory of the columns and plates at normal temperature. Analysis of the stability factor, the critical temperature of high strength steel columns under axial load and the width-to-thickness ratio has been performed. The results showed that the stability factor and critical temperature for mild steel are not applicable for high strength steel. The stability factor for high strength steel is smaller than that for mild steel and at the same load ratio (bigger than 0.5), the critical temperature for high strength steel columns is lower than that for mild steel columns, and for the slender columns, the width-to-thickness ratios for high strength steel columns are bigger than that for mild steel for stub columns but for the slender columns, there is little difference. To validate the proposed analytical method, finite element studies were carried out and good agreement has been found between the results of proposed method, finite element analysis and experiments. Parametric studies are conducted to investigate the influence of modeling initial stress, initial imperfections, slenderness, section size and mechanical properties, on the fire resistance of high strength steel columns.
AB - In this paper, an analytical method was presented to investigate the fire resistance of axially loaded high strength steel columns. By introducing the mechanical properties of high strength steel at elevated temperature, the critical stress and critical temperature of high strength steel columns subjected to axial compression, and the width-to-thickness ratio for the flange and the web at elevated temperature are deduced, based on the stability theory of the columns and plates at normal temperature. Analysis of the stability factor, the critical temperature of high strength steel columns under axial load and the width-to-thickness ratio has been performed. The results showed that the stability factor and critical temperature for mild steel are not applicable for high strength steel. The stability factor for high strength steel is smaller than that for mild steel and at the same load ratio (bigger than 0.5), the critical temperature for high strength steel columns is lower than that for mild steel columns, and for the slender columns, the width-to-thickness ratios for high strength steel columns are bigger than that for mild steel for stub columns but for the slender columns, there is little difference. To validate the proposed analytical method, finite element studies were carried out and good agreement has been found between the results of proposed method, finite element analysis and experiments. Parametric studies are conducted to investigate the influence of modeling initial stress, initial imperfections, slenderness, section size and mechanical properties, on the fire resistance of high strength steel columns.
KW - Column
KW - Critical temperature
KW - Fire resistance
KW - High strength steel
KW - Local buckling
UR - http://www.scopus.com/inward/record.url?scp=84891708273&partnerID=8YFLogxK
U2 - 10.1016/j.proeng.2013.08.115
DO - 10.1016/j.proeng.2013.08.115
M3 - Conference article
AN - SCOPUS:84891708273
VL - 62
SP - 690
EP - 701
JO - Procedia Engineering
JF - Procedia Engineering
SN - 1877-7058
T2 - 9th Asia-Oceania Symposium on Fire Science and Technology, AOSFST 2012
Y2 - 17 October 2012 through 20 October 2012
ER -