Effective lengths of concrete-filled steel square hollow sections in fire

摘要

Current fire design to the Eurocodes allows the effective length of concrete- filled steel hollow-section columns, in braced multistorey buildings, to be taken s 0.7 or 0.5 times the system length of the column, depending on whether the column is continuous at one or both ends. In the case where the column is continuous At both ends, numerical analyses pre- Sented in this paper show that, provided Local buckling does not occur, an effective Length of 0.55 can be assumed.