H型截面钢柱抗火简化计算研究

笔者对H型截面钢柱进行抗火简化计算研究,利用推导出来的简化公式对3根钢柱在火灾下的极限承载力进行了计算,并将简化计算值与试验值进行比较分析.得出结论:钢柱在火灾作用下,沿弱轴方向的长细比大于沿强轴方向的长细比,沿弱轴方向的失稳临界力小于沿强轴方向的失稳临界力,钢柱沿弱轴方向先行破坏.对于不限制轴向变形钢柱,简化计算结果和试验值吻合较好,简化计算是可行的.

Simplify Calculation of the Behavior of H-Section Steel Column in Fire

In the present paper,simplified calculation formula of the fire resistance for H-section steel column was established and the ultimate load capacity of three H-section steel column in fire was calculated by the simplified formula.Experimental results and calculation results were compared and analyzed.It indicated that slenderness ratio of steel column along weak axis was larger than that along strong axis and the critical force on instability of steel column along weak axis was smaller than that along strong axis.Steel column was initially failed along weak axis.Furthermore,the caculation computing results validated the experimental results for axial free expansive column.