Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
13.
An out-of-plane mechanical response of a planar steel frame in fire
Ogrin, Anita ; Saje, Miran ; Hozjan, Tomaž
The paper presents a study on an out-of-plane mechanical response of a planar steel frame in standard and natural fire. A numerical model for dynamic analysis of spatial beam-like structures ...subjected to fire conditions is employed to obtain the out-of-plane deformations. The planar frame is analysed with different planar temperature distributions over the steel cross-sections and different types of supports. A bilinear material model for steel with an explicit model of viscous creep and the material model according to EN 1993-1-2 are considered. It is shown that in certain cases the present spatial numerical model detects out-of-plane deformations of the planar frame, which then have a considerable influence on the calculated failure time. Furthermore, a short study on the effect of in- and out-of-plane geometrical imperfections of the planar frame on its spatial mechanical response is presented.
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