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Abstract
Under fire, membrane action plays an important role in the performance of slabs subjected to large deflections. In this paper, 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 treatment of the system of shape functions for the “in-plane” 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 transmitted 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 by the results obtained from experiments.
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Notes on contributors
Vadims Goremikins
Vadims GOREMIKINS. Dr Sc.Ing. Postdoctoral Researcher at Department of Steel and Timber Structures of Czech Technical University in Prague, Czech Republic and Leading Researcher at Institute of Structural Engineering and Reconstruction of Riga Technical University, Latvia. Author and co-author of 21 scientific publications. Research interests: structural fire design, composite structures, cable structures, suspension bridges.
Jiří Šejnoha
Jiří ŠEJNOHA. Dr Sc. Prof. at Department of Mechanics of Czech Technical University in Prague, Czech Republic. Member of Scientific Board. Author and co-author of more than 250 scientific articles. Research interests: tunnel construction, masonry structures, numerical methods, composite structures.
František Wald
František WALD. CSc. Prof. at Department of Steel and Timber Structures of Czech Technical University in Prague, Czech Republic. Member of Faculty Academic Senate, Member of Scientific Board. Author and co-author of more than 160 scientific and methodological publications. Research interests: steel structures, connection design, structural fire design, aluminium structures, sandwich panels.
Jan Bednář
Jan BEDNÁŘ. Ing. PhD student. Researcher at Department of Steel and Timber Structures of Czech Technical University in Prague, Czech Republic. Author of 2 scientific publications. Research interests: structural fire design, concrete structures.