Abstract
Previous studies of concrete-encased concrete-filled steel tube (CFST) columns have demonstrated their enhanced fire performance due to the passive protection of the outer encasement. To facilitate the design and application of concrete-encased CFST structures, the fire performance of full-scale reinforced concrete beam to concrete-encased CFST column joints subjected to full-range fire including heating and cooling phases was studied experimentally. This paper presents the experimental programme and reports the experimental results related to temperature. Finite element analysis (FEA) models of varying complexities were also incorporated to complement the fire tests and to better interpret the temperature developments. Results show that beam failure was observed for all tested specimens. Concrete explosive spalling was insignificant due to the low strength of the outer concrete. The temperature of the joint zone was tremendously reduced compared to the connected members due to the passive protection of outer concrete and the heat sink effect. For the region close to the steel tube, the temperature-time curves showed a significant moisture plateau. The FEA models produced satisfactory temperature predictions when the thermal properties in Eurocode 4 were used.
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