FIRE RESISTANCE OF COMPOSITE COLUMNS MADE OF CONCRETE FILLED CIRCULAR HOLLOW SECTIONS AND WITH RESTRAINED THERMAL ELONGATION

摘要

Despite several research studies (numerical and experimental) on fire resistance of CFCH column, its behaviour in fire is not completely understood.Most of these studies did not consider the restraining to column thermal elongation, important parameter for behavior of the column on fire when that one is inserted in a structure.This paper presents a three-dimensional nonlinear finite element model developed in ABAQUS to predict the behavior in fire of CFCH columns with restrained thermal elongation.The model was validated in comparison with a series of fire resistance tests on CFCH columns with axial and rotational restraining to thermal elongation.The numerical model presents results in close agreement with the experimental data.