中文摘要：

为研究H型截面钢柱在火灾中的行为,自行研制了柱火灾试验炉,对6个试件进行试验研究,考虑轴压比和柱端约束的不同。试验中测得了柱炉内烟气温度、钢柱截面温度、钢柱侧移、钢柱轴向变形和限制轴向变形后产生的附加轴压力。试验结果表明：裸露钢柱四面受火时,同一截面温度基本相同;钢柱高度相同时,各工况下轴向变形相差不大,增大柱端约束,轴向变形略小,若轴向变形受限制,轴压比增大,产生的附加轴力反而减小,但试件所受轴力总和并不一定小;钢柱在火灾中的行为,明显分为膨胀阶段和压缩阶段,其中主要是膨胀阶段,压缩阶段很短。膨胀阶段试件虽然温度已经很高,但能够稳定的承受所施加的荷载,此阶段侧向变形也较小。

英文摘要：

To study the performance of an exposed H-section steel column,we developed a fire test furnace.Six specimens were studied,considering the differences of axial compression ratios and restrictions.The temperatures of furnace gas and steel columns,lateral and axial deformations of steel columns,and the additional axial force for limited axial deformation were measured.The results show that： the same section＇s temperature is almost the same when the exposed steel columns encircled by fire;the axial deformation of steel columns with the same height is almost the same,restrictions are enhanced,and the axial deformations are slightly smaller;the axial compression ratio increases when axial deformations are restricted and the additional axial force decreases,but the sum is not necessarily small.Throughout the course of experiment,the behavior of steel columns in fire is clearly divided into two stages of expansion and compression,expansion is main and compression phase is very short.Although the temperature of steel columns is very high,the steel columns can withstand the axial pressure steady and produced very small lateral deformations.