Fire performance of an unprotected composite beam behaviour with finite beam end restraints, rebar size and locations

Serdar Selamet


The fire performance of steel connections is crucial to provide integrity and stability to floor systems. In full-scale fire tests, the steel frame systems experience large deflections and rotations, which in turn subject the connections to large axial forces and moments. The shear connections, which have limited rotational allowance due to a small gap distance between the beam and the supporting member, exhibit a semi-rigid behavior during fire. Further, the effect of the concrete slab is observed to be beneficial to the deflection behavior of the floor system in several experiments. In this study, the fire performance of a beam with a concrete slab is investigated with varying degrees of rotational rigidity and the tension capacity of the concrete slab with steel rebars. The thermo-mechanical analysis capability of Opensees is utilized.

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