A part of an analytical model representing the web post buckling for cellular beams in case of fire is described. It is based on the Arcelor web post buckling model developed for cold conditions and some experimental results for full scale composite floor cellular steel beams at ambient and elevated temperatures. A finite element model using shell elements was developed considering both material and geometrical non-linearity. It is calibrated on the basis of experimental results. The comparison between the finite element prediction and actual experimental results showed a good agreement in terms of failure modes, load deflection relationship and ultimate loads. At failure, temperature measured during the fire tests indicated that failure arising by web post buckling of cellular beams in fire can not be simply estimated by applying temperature dependent reduction factors on stiffness, as given in codes. So the Arcelor web post buckling model was adapted in case of fire and was justified using a parametrical study using FEM analysis.
|Title of host publication||Unknown Host Publication|
|Number of pages||9|
|Publication status||Published - 30 May 2008|
|Event||Structures in Fire - Singapore|
Duration: 30 May 2008 → …
|Conference||Structures in Fire|
|Period||30/05/08 → …|