Ultimate Load of Slabs in Fire Enhanced by Tensile Membrane Action with Flexible Supporting Edge Beams
Date of Issue2014
8th International Conference on Structures in Fire
School of Civil and Environmental Engineering
A number of previous analytical studies have been conducted to predict the enhanced loadbearing capacity of slabs due to tensile membrane action. These analytical approaches are based on an implicit assumption that vertical supports along the slab panel boundaries at all times during a fire do not deform. In reality the edge beams do deform even though they are fire-protected, and thus this assumption may be nullified. This renders their predictions to be unconservative when there is significant deflection of protected edge beams. This work looks at the actual condition where the protected supporting edge beams do deflect, and the slab still bends in synclastic curvature. The authors propose a semi-analytical model which can predict the load-bearing capacity of the composite beam-slab floor systems under fire conditions enhanced by tensile membrane action, but reduced by deflection of the protected edge beams. Its feature is that the deflection of the protected edge beams can be taken into account of calculation of the slab enhancement factor.
Tensile membrane action
© 2014 ETH Zurich. This is the author created version of a work that has been peer reviewed and accepted for publication by 8th International Conference on Structures in Fire, ETH Zurich. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://www.cnki.net/kcms/detail/detail.aspx?dbname=IPFDTEMP&filename=SHCB201406001036&dbcode=IPFD&v=MDAwNDE3cVFLcmlmWnVCdkVDdmpVN3ZJSVZvUU5pWEliTEc0SDlYTXFZOUZaZXNNQ2hNNHptVVdtVDhJVGdyZ3F4TkdE].