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| Reference : Structural Behavior of Concrete Columns under Natural Fires including Cooling Down Phase |
| Scientific congresses and symposiums : Paper published in a book | |||
| Engineering, computing & technology : Civil engineering | |||
| http://hdl.handle.net/2268/103981 | |||
| Structural Behavior of Concrete Columns under Natural Fires including Cooling Down Phase | |
| English | |
Gernay, Thomas  [Université de Liège - ULg > Département Argenco : Secteur SE > Ingénierie du feu >] | |
| Dimia, M. S. [University of Batna > > > >] | |
| Nov-2011 | |
| Proceedings of The International Conference on Recent Advances in Nonlinear Models - Structural Concrete Applications | |
| Barros, Helena | |
| Faria, Rui | |
| Pina, Carlos | |
| Ferreira, Carla | |
| RAGRAF | |
| 637-656 | |
| Yes | |
| International | |
| 9789729652479 | |
| Portugal | |
| International Conference on Recent Advances in Nonlinear Models - Structural Concrete Applications | |
| 24-25 November 2011 | |
| University of Coimbra | |
| Coimbra | |
| Portugal | |
| [en] Concrete Columns ; Natural Fire ; Constitutive Model ; Transient Creep | |
| [en] This study deals with the structural behavior of concrete columns subjected to
natural fire, with special focus on the cooling down phase. As the reliability of the numerical simulations largely depends on the validity of the constitutive models that are used, this issue is addressed in details in the first part of the paper. It is found that the current concrete model of Eurocode may not be adapted for representing the behavior of concrete during a cooling phase because the effects of transient creep are incorporated implicitly in the mechanical strain term. A formulation of the Eurocode concrete model that contains an explicit term for transient creep strain has been developed and, after implementation in the software SAFIR, it was used for the numerical simulations presented in this paper. In its second part, the study gives an insight into the possibility of collapse of reinforced concrete columns during and after the cooling phase of the natural fire. It is found that failure during the cooling phase of a fire is a possible event and, more dangerous, that a failure of the concrete columns is still possible when the fire has been completely extinguished. The main mechanisms that lead to this type of failure are found to be the delayed increase of temperature in the central zones of the element and the additional loss of concrete strength during the cooling phase of the fire. A parametric study shows that the most critical situations with respect to delayed failure arise for short fires and for columns with low slenderness or massive sections. The numerical analyses have been performed also with the concrete model of Eurocode and the results also show a risk of delayed collapse. Yet, the occurrence of collapse during or after the cooling phase is predicted more often with the explicit creep model than with the implicit model of Eurocode, which suggests that the way the transient creep effects are handled in the Eurocode model may lead to unsafe results when considering the cooling phase of a fire. | |
| Researchers ; Professionals | |
| http://hdl.handle.net/2268/103981 |
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