圆形空心钢管混凝土柱的耐火性能实验研究

关于实心钢管混凝土的耐火性能已有大量的实验研究,而空心钢管混凝土的耐火实验目前还非常少见。针对这一不足,对空心钢管混凝土进行了耐火实验研究,其中考虑了不同的空心率,并对中空注水对构件耐火性能的影响也进行了实验研究。实验结果表明：在相同的荷栽比下,构件的耐火时间随空心率先增大后减小。当空心率较小时,中空注水对构件耐火时间的提高作用不明显;当空心率较大时,注水对耐火时间的提高才体现出来。

Experimental Study on Fire Resistance of Circle Hollow Concrete-filled Steel Tube Columns

There are a lot of experimental and numerical studies on solid concrete-filled steel tube（SCFST）, but the fire resistance experimental study on hollow concrete-filled steel tube（H-CFST） is rare. For this reason,experimental research on fire resistance of H-CFST is carried out,and different hollow ratios and holes with or without water are considered in these tests.The test results show that the fire resistance time of H-CFST under the same load ratio firstly increases and then decreases with hollow ratio increasing; when the hollow ratio is small,the increase of fire resistance time is very small for column with water,and when the hollow ratio is big,the fire resistance time of column with water is longer than that without water.