Analytical behaviour of RC beam to CFST column frames subjected to fire

The present study is a theoretical investigation on the fire performance of concrete filled steel tubular (CFST) column and reinforced concrete (RC) beam frames. The planar composite frame consists of two CFST columns and a RC beam with slab. A finite element analysis (FEA) model was developed and verified against test results of the same composite frames presented in the companion paper. A comparison of results calculated using this model shows generally good agreement with test results. The FEA model is then used to investigate the behaviour of similar framed structures in fire. Stresses and strains are analyzed as well as structural deformations and internal forces to identify the failure mechanism of the frames. The influence of important parameters on the load bearing mechanism of the composite framed structures investigated specifically and suggestions are made regarding calculation of the fire resistance of the frame.

► Fire performance of composite frames was studied.
► A finite element analysis (FEA) model was developed.
► Parametric analysis on the fire performance was performed.
► Failure modes of the composite frame were analyzed.