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Abstract

A study has been performed on the collapse of reinforced concrete columns subjected to natural fire conditions during and after the cooling phase of the fire. The aim is, first, to highlight the phenomenon of collapse of concrete columns during and after the cooling phase of a fire and then, to analyze the influence of some determinant parameters. The main mechanisms that lead to this type of failure are found to be the delayed increase of the temperature in the central zones of the element and the additional loss of concrete strength during the cooling phase of the fire. A parametric analysis considering different fires and geometric properties of the column shows that critical conditions with respect to delayed failure arise for short-duration fires and for columns with low slenderness or massive sections.

Keywords

Fire resistance reinforced concrete concrete column cooling phase residual strength

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References

Fike

Kodur

VKR

. An approach for evaluating the fire resistance of CFHSS columns under design fire scenarios. Journal of Fire Protection Engineering 2009; Vol. 19: 229–259, No. 4.

Kirby

Lapwood

Thomson

. The reinstatement of fire damaged steel and iron framed structures. British Steel Corporation, Swinden Laboratories, 1986.

Li Y-H and Franssen J-M. Residual compressive strength of concrete after a fire. Journal of Structural Fire Engineering (accepted for publication).

Hsu J-H and Lin C-S. Residual bearing capabilities of fire-exposed reinforced concrete beams. International Journal of Applied Science and Engineering 2006, Vol. 4: 151–164, No. 2.

Hsu J-H and Lin C-S. Effect of fire on the residual mechanical properties and structural performance of reinforced concrete beams. Journal of Fire Protection Engineering 2008, Vol. 18: 245–274, No. 4.

Wald

Kallerova

. Draft summary of results from fire test in Mokrsko 2008. Prague: Ceska technika, 2009.

Firehouse.com. Seven Swiss firefighters die in collapsed parking garage. 2004. http://www.firehouse.com/news/lodd/seven-swiss-firefighters-die-collapsed-parking-garage. Accessed on 9 September 2011.

EN 1991-1-2. Eurocode 1: Actions on structures – Part 1–2: General actions – Actions on structures exposed to fire. Brussels: CEN, 2002.

Franssen J-M. SAFIR: A thermal/structural program for modeling structures under fire. Engineering Journal – American Institute of Steel Construction Inc. 2005, Vol. 42: 143–158, No. 3.

10.

EN 1994-1-2. Eurocode 4 – Design of composite steel and concrete structures. Part 1–2: General rules – Structural fire design. Brussels: CEN, 2005.

11.

EN 1992-1-2. Eurocode 2: Design of concrete structures – Part 1-2: General rules – Structural fire design. Brussels: CEN, 2004.

12.

Schneider U. Properties of materials at high temperatures: Concrete. RILEM, University of Kassel, 1985.

13.

Yi-Hai

Franssen

J-M

. Test results and model for the residual compressive strength of concrete after a fire. Journal of Structural Fire Engineering 2011; Vol. 2: 29–44, No. 1.

14.

Felicetti R, Gambarova PG, Silva M and Vimercati M. Thermal diffusivity and residual strength of high-performance light-weight concrete exposed to high temperature. In: 6th International Symposium on Utilization of HSC/HPC, Leipzig, Proc. V2, 2002, pp. 935–948.

15.

Gernay T and Franssen J-M. A comparison between explicit and implicit modelling of transient creep strain in concrete uniaxial constitutive relationships. In: Proceedings of the Fire and Materials 2011 Conference, San Francisco, 2011, pp. 405–416.

16.

Gernay

. Effect of transient creep strain model on the behavior of concrete columns subjected to heating and cooling. Fire Technology (accepted for publication).

Collapse of concrete columns during and after the cooling phase of a fire

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