Evidence of fire resistance of hollow-core slabs

Kristian Dahl Hertz, Lars Schiøtt Sørensen, Luisa Giuliani

    Research output: Contribution to conference without publisher/journalPaper without publisher/journalResearch


    Hollow-core slabs have during the past 50 years comprised a variety of different structures with different cross-sections and reinforcement. At present the extruded hollow-core slabs without cross-reinforcement in the bottom flange and usually round or oval longitudinal channels (holes) are predominant and in Denmark they are applied where fire resistances of 60- and 120 minutes are required.
    In 2007 hollow-core deck elements with in-situ cast top concrete de-laminated during a fire in a car-park floor of a building in Rotterdam, where the bottom flanges of some decks fell down. A debate is therefore going on in the Netherlands about the fire resistance of hollow-core slabs.
    In 2014 the producers of hollow-core slabs have published a report of a project called Holcofire containing a collection of 162 fire tests on hollow-core slabs giving for the first time an overview of the fire tests made.
    The present paper analyses the evidence now available for assessment of the fire resistance of extruded hollow-core slabs.

    The 162 fire tests from the Holcofire report are compared against the requirements for testing from the product standard for hollow-core slabs EN1168 and knowledge about the possible assessment of the fire resistance from the tests is derived.
    For comparison a calculation approach is applied for the assessment in accordance to the product standard that refers to the Eurocode for concrete structures EN1992-1-2.
    Translated title of the contributionEvidens for brandmodstandsevnen af huldæk
    Original languageEnglish
    Publication dateJun 2015
    Number of pages11
    Publication statusPublished - Jun 2015
    Event5th Fire Safety Day 2015 - Danmarks Tekniske Universitet, Lyngby, Denmark
    Duration: 9 Jun 20159 Jun 2015
    Conference number: 5


    Conference5th Fire Safety Day 2015
    LocationDanmarks Tekniske Universitet


    • hollow-core slabs
    • fire test
    • standard fire resistance
    • fire calculation

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