中文摘要：

对2根H型截面钢柱进行了火灾行为的试验研究。采用足尺试验形式,柱长3 300mm，钢柱在试验过程中限制轴向变形。通过试验，得出了钢柱在火灾下的侧向变形和轴向约束力情况。试验表明，限制轴向变形对钢柱火灾行为产生明显的影响，二次受火钢柱极限温度明显降低，为今后钢结构火灾行为研究提供依据。

英文摘要：

The behaviour of two H-section steel columns under fire is investigated. All columns are full scale with 3 300mm length under axial restraint. From the test results,the regularities of lateral deflection and axial restraint force are presented. The test results show that the behaviour of steel columns under fire is influenced by restrained thermal elongation. Limit temperature decreases if steel columns are subject to fire again. Which provides a basis for further research to explore fire behaviours of steel structures.