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Burnout resistance of concrete slabs : probabilistic assessment and global resistance factor calibration

Tijdschriftbijdrage - Tijdschriftartikel

Traditional prescriptive requirements for structural fire design do not explicitly ensure the load bearing capacity of the structure up to and including burnout. Therefore, a deterministic design method is presented, which enables to perform a quick check of the burnout bending resistance of a concrete slab exposed to a natural fire, and allows for the evaluation of (delayed) bending failure that can occur during or after the cooling phase, that would otherwise remain undetected. Subsequently, the influence of the inherent uncertainties associated with material properties and geometry on the design until full burnout is investigated. Reference fragility curves are presented and subsequently a global resistance factor (GRF) safety format for the fire design considering complete burnout scenarios is proposed. Application of the determined GRF allows for an explicit reliability-based design for fire exposed concrete slabs, without requiring the application of full-probabilistic methods. The concept is applied to simply supported reinforced concrete slabs and the calculated values are applicable to any compartment within the Eurocode parametric fire framework, through application of a scaling approach. The methods proposed in this contribution are intended as a stepping stone towards the development of GRF-based safety formats for more complex geometries and advanced numerical tools.
Tijdschrift: FIRE SAFETY JOURNAL
ISSN: 1873-7226
Volume: 119
Jaar van publicatie:2021
Toegankelijkheid:Open