Reference : A formulation of the Eurocode 2 concrete model at elevated temperature that includes ...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/2268/114050
A formulation of the Eurocode 2 concrete model at elevated temperature that includes an explicit term for transient creep
English
Gernay, Thomas mailto [Université de Liège - ULg > Département Argenco : Secteur SE > Ingénierie du feu >]
Franssen, Jean-Marc mailto [Université de Liège - ULg > Département Argenco : Secteur SE > Ingénierie du feu >]
Jul-2012
Fire Safety Journal
Elsevier Science
51
1-9
Yes (verified by ORBi)
International
0379-7112
Oxford
United Kingdom
[en] Concrete ; Fire ; Constitutive model ; Transient creep strain ; Eurocode
[en] The first objective of this paper is to highlight the capabilities and limitations of concrete uniaxial
constitutive models at elevated temperatures for thermo-mechanical behavior modeling, depending on the implicit or explicit consideration of transient creep strain in the model. The characteristics inherent to the two types of models are described and compared. It appears that one of the major limitations of implicit models concerns the unloading stiffness. Based on numerical analysis performed on loaded concrete columns subjected to natural fire, it is shown that the stress–temperature paths experienced by structural concrete are varied and complicated and that concrete material models cannot handle properly these complex situations of unsteady temperatures and stresses without explicit consideration of transient creep.
The second objective of the paper is to propose a new formulation of the Eurocode 2 concrete
material model that contains an explicit term for transient creep. The new model is implemented in the software SAFIR and validated against experimental data of the mechanical strain developed by concrete cylinders under different unsteady temperatures and loads. It is shown that the actual material behavior is better matched with the new explicit model than with the current implicit Eurocode 2 model. Finally, a comparison is given between experimental and computed results on a centrally loaded concrete column submitted to heating–cooling sequence.
Structural Engineering Division
Researchers ; Professionals
http://hdl.handle.net/2268/114050
http://dx.doi.org/10.1016/j.firesaf.2012.02.001

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