Analytical Model of Composite Structure with Steel Fibre Reinforced Concrete Slab and Steel Beams Subjected to Fire
Proceedings of Workshop "Structural Fire Engineering" 2014
Vadims Goremikins, Jiri Sejnoha, Frantisek Wald, Jan Bednar

Membrane action plays an important role in the performance of slabs subjected to large deflections, due to fire. A new model is proposed based on a proper approximation of horizontal displacements for a simply supported composite slab. The novelty of the proposed approach consists in a special selection of the system of shape functions for the horizontal displacements. Moreover, a load applied to the slab is divided into two components, so that one component is balanced by the membrane forces, while the second one is balanced by the bending forces (including transfer of shear and moment). The deflection due to thermal elongations is replaced by the identical deflection caused by a fictitious load. Unknown parameters are calculated using the principle of virtual displacements. The effectiveness of the model is validated through the results obtained from experiments. The model confirms the phenomena of appearance of a tension membrane at the centre of the slab and a compressive ring around the perimeter.


Atslēgas vārdi
Fire

Goremikins, V., Sejnoha, J., Wald, F., Bednar, J. Analytical Model of Composite Structure with Steel Fibre Reinforced Concrete Slab and Steel Beams Subjected to Fire. No: Proceedings of Workshop "Structural Fire Engineering", Vācija, Braunschweig, 15.-15. septembris, 2014. Braunschweig: 2014, 1.-9.lpp.

Publikācijas valoda
English (en)
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