柱端不同约束H型截面钢柱抗火性能研究

Study on performance of different restriction of H-section steel columns in fire

为探讨火灾作用下裸露H型截面钢柱的抗火性能和破坏模式,对2根不同柱端约束的H型截面钢柱在相同荷载水平作用下的抗火性能进行试验研究。采用自行研制的柱炉对试件进行模拟火灾试验,试验升温曲线很好地模拟了火灾燃烧特点,试验中测得了钢柱的变形曲线和温度分布。结果表明:在火灾作用下,裸露钢柱在较高温度下具有较好的抗火能力,增强柱端约束可以提高其抗火性能。

To study the fire-resistant performance and failure mode of H-section steel column exposed to fire,an experimental investigation is carried out on two different restriction steel columns under the same loading level.The specimen temperature is elevated by the column furnace,temperature-time curve is made to simulate the characteristics of fire,and the deformation curves and temperature distribution of steel column are thus detected.The results show that： the column exposed to fire has a good fire resistant capacity and enhanced constraint can significantly improve the fire resistant property of column.