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Fire resistance of concrete slabs acting in compressive membrane action
Molkens, Tom; Gernay, Thomas; Caspeele, Robby
2017In Nigro, Emidio; Bilotta, Antonio (Eds.) Proceedings of the 2nd International Fire Safety Symposium - IFireSS 2017
Peer reviewed
 

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Keywords :
Concrete slab; Compressive membrane action; Numerical simulation; Finite element; SAFIR; Fire
Abstract :
[en] In building renovation, the real behaviour of reinforced concrete slabs cannot always be explained by the bending theory according to classical structural mechanics. Indeed, the bearing capacity, as assessed for instance by a loading test, sometimes appears to be much higher than what would be expected. This phenomenon may be caused by the activation of an arch-effect or so-called compressive membrane action (CMA) which can develop even with small vertical deformations. For a slab which is completely restrained, the presence of reinforcement becomes of lesser importance when this phenomenon is activated (except for end fields). Hence, for fire resistance purposes, it can be discussed whether reinforcement and concrete cover has a smaller influence on the bearing capacity for slabs subjected to fire which exhibit a significant concrete compressive membrane behaviour. This paper presents a loading test performed on a real concrete building which highlighted the development of CMA as the load bearing mode. It then proposes a strategy to evaluate the behaviour resulting from the development of CMA in reinforced concrete slabs at ambient and at elevated temperature based on numerical modelling. The numerical analyses are performed with the finite element software SAFIR® using a strip of layered shell elements. A plastic-damage constitutive model with an explicit transient creep formulation is used to capture the concrete behaviour at elevated temperature.
Disciplines :
Civil engineering
Author, co-author :
Molkens, Tom;  Sweco Belgium
Gernay, Thomas ;  Université de Liège > Département ArGEnCo > Ingénierie du feu
Caspeele, Robby;  Ghent University > Structural Engineering
Language :
English
Title :
Fire resistance of concrete slabs acting in compressive membrane action
Publication date :
08 June 2017
Event name :
2nd International Fire Safety Symposium - IFireSS 2017
Event organizer :
University of Naples Federico II
Event place :
Naples, Italy
Event date :
7-9 Jun 2017
Audience :
International
Main work title :
Proceedings of the 2nd International Fire Safety Symposium - IFireSS 2017
Author, co-author :
Nigro, Emidio
Bilotta, Antonio
Publisher :
Doppiavoce, Naples, Italy
ISBN/EAN :
978-88-89972-67-0
Pages :
661-668
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 25 April 2017

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