Abstract
This paper presents experimental results of full-scale loaded heat tests and small-size heat tests of concrete-filled steel tubular columns (CFST columns) using Fire-Resistant steel (FR steel). By covering the tube surface with protection having lower insulation property, CFST columns could get longer fire resistance time by its heat capacity of the inner concrete and could resist to the bending moment caused by eccentric load without reinforcement by keeping the steel temperature lower than 600℃. Ceramic type protection, foaming type intumescent coating, gypsum plaster board, ceramic fiber and wet rockwool were used for the protection material.
