Methode zur effizienten modellierung von verbunddeckensystemen im brandfall

This paper presents an efficient method – based on the method by Stadler [1] – for modelling of composite slabs systems consisting of composite slabs or reinforced concrete slabs as well as protected and unprotected steel beams in case of fire. The presented method considers membrane actions due to geometrically non-linear finite element analyses that are performed on a whole composite slab system. The aim is not only to keep the modelling effort low but also to generate realistic results. Both, the reinforced concrete slab and the composite slabs, are modelled by shell elements. Due to layer elements, which had been implemented in commercial finite-element softwares like Sofistik [22], a non-linear temperature over the slab depth can be taken into account. The steel beams are modelled by ordinary beam elements. Furthermore, experiments run by the Technical University of Munich [2] are used to check whether this method generates realistic results. The method is widely independent of the time-temperature curve which means that not only the standard temperature curve ISO 834 [3] but also natural fire scenarios like the parametric natural fire curve introduced in the German national annex of Eurocode 1 part 1–2 [4] can be considered.