ABSTRACT
Both Concrete-Filled Steel Tubular columns (CFST) and composite steel-concrete beams embedded in floors (slim-floors) are being increasingly used in new construction proposals. The fire performance of these structural elements has been studied in recent years separately. Nevertheless, understanding the fire behavior of the connections between both elements may be an important issue in the global structural response of these composite solutions. In this work, an advanced finite element thermal model is developed to assess the behavior of these connections in the fire situation. The embedment of the connection into the slim-floor is studied, which provides a thermal protection to the blind-bolt. The thermal behavior of this slim-floor connection was compared against non-encased beams, reaching 600ºC difference in the lower bolt at 60 minutes of fire exposure. It shows that the bolt temperature into the slim-floor, which is lower than 200ºC, would have little effect on the connection structural resistance.
