RESEARCH ARTICLE
1. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. State Key Laboratory for Disaster Reduction in Civil Engineering, School of Civil Engineering, Tongji University, Shanghai ??200092, China; 3. Department of Civil and Environmental Engineering, Michigan State University, East Lansing MI 48824, USA
发布日期：
2014-03-05
摘要
To develop a methodology for evaluating fire resistance of high strength Q460 steel columns, the load bearing capacity of high strength Q460 steel columns is investigated. The current approach of evaluating load bearing capacity of mild steel columns at room temperature is extended to high strength Q460 steel columns with due consideration to high temperature properties of high strength Q460 steel. The critical temperature of high strength Q460 steel column is presented and compared with mild steel columns. The proposed approach was validated by comparing the predicted load capacity with that evaluated through finite element analysis and test results. In addition, parametric studies were carried out by employing the proposed approach to study the effect of residual stress and geometrical imperfections. Results from parametric studies show that, only for a long column (slenderness higher than 75), the magnitude and distribution mode of residual stress have little influence on ultimate load bearing capacity of high strength Q460 steel columns, but the geometrical imperfections have significant influence on any columns. At a certain slenderness ratio, the stability factor first decreases and then increases with temperature rise.
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