Original scientific paper

Behaviour of prestressed hollow core concrete slab under fire – experimental study

Neno Torić orcid.org/0000-0002-7530-7619 ; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, Matice Hrvatske 15, Split, Croatia
Vladimir Divić ; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, Matice Hrvatske 15, Split, Croatia
Ivica Boko orcid.org/0000-0003-2282-8362 ; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, Matice Hrvatske 15, Split, Croatia

Abstract

The paper presents an experimental study of behaviour of a prestressed hollow-core slab exposed to ISO fire curve. Dimensions of the slab are 1,2 × 8,0 m. The study includes measurements of temperature gradient inside the section of the slab, voids, and upper surface of the slab. Time dependent vertical deflection of the structure was recorded by using two linear variable differential transformers (LVDT). Two additional LVDTs were used for tracking the rotation at the end of the slab. In addition, measurements of the time dependent longitudinal deformation of the slab at midspan were also carried out with two strain gauges. The study has shown that the behaviour of slab under fire depends on the temperature of the prestressed strands, combined with the degradation of the modulus of elasticity of the heated concrete. Shear failure had no effect on the load bearing capacity of the slab.

Keywords

concrete; deformation; fire; hollow-core slab; LVDT; mechanical behaviour; prestressed steel; strain gauge; temperature measurements; vertical deflection

Hrčak ID:

93558

URI

https://hrcak.srce.hr/93558

Publication date:

12.12.2012.

Article data in other languages: croatian

Visits: 3.013 *