Meri Cvetkovska, Koce Todorov and Ljupco Lazarov
The non uniform temperature fields in the cross section of the structural elements exposed to fire cause thermal dilatations which induce internal forces. In same time temperature…
Abstract
The non uniform temperature fields in the cross section of the structural elements exposed to fire cause thermal dilatations which induce internal forces. In same time temperature changes cause longitudinal elongations and if these elongations are restricted, additional axial stresses will be induced. In this case the various support conditions can have a significant influence on fire resistance of reinforced concrete elements. In this paper three different support conditions as: pin-pin, pin-fixed and fully fixed were used to model RC beams with various level of axial restraint. The beams were exposed to the ISO-fire curve. The numerically obtained results are presented and based on these results it can be concluded that increasing of axial spring stiffness increases the induced axial forces and the fire resistance of the beams.
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Ljupco Lazarov, Meri Cvetkovska and Koce Todorov
Fire following an earthquake is an important factor causing damage to buildings and life-line structures. Therefore, besides satisfying structural design requirements for normal…
Abstract
Fire following an earthquake is an important factor causing damage to buildings and life-line structures. Therefore, besides satisfying structural design requirements for normal loads, such as dead and live loads including the seismic hazard, buildings should also be designed to withstand the fire following earthquakes for a certain minimum duration as required for a desired level of performance. The behavior of a particular reinforced concrete structure that was fire exposed after seismic action is presented in this paper. The seismic response of the structure is evaluated using a pushover analysis, while the displacement demand under the corresponding seismic event is determined using the recommendations implemented in Eurocode 8.