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.