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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 4
Short steel and concrete columns under high temperatures
pattern occurred for the tests with the 60-minute exposure time.
The computational and experimental results were similar regarding
the following points in the cross-sectional analysis: the external
steel portion of the model and the concrete core. These findings
show that the coefficients used by the program and standardized
by the BS EN 1994 [7] and [8] were suitable for the theoretical
analysis.
The experimental results obtained for the steel-concrete interface
and the computational analysis differ somewhat. This divergence
could be due to the fact that the experimental measurement was
made by placing the thermocouple into the model in a hole created
in the metallic tube prior to the curing of the concrete. Thus, the
thermocouple was pressed against the concrete.
7. Acknowledgements
The authors would like to thank the São Paulo Research Founda-
tion (Fundação de Amparo à Pesquisa do Estado de São Paulo,
FAPESP) for the research grant that financed the experimental
portion of this study and the Thematic Project (Projeto Temático)
of the same body, which provided conditions for the continuation
of the research.
8. References
[01] INTERNATIONAL STANDARDIZATION FOR
ORGANIZATION – Fire resistance tests – Elements
of building construction. ISO 834. Genève. 1994.
[02] ANDERBERG, Y.; TCD 5.0 - User’s Manual. Fire
Safety Design, Lund, 1997.
[03] SIMÕES, R. (2008). Efeito do confinamento em
pilares misto curtos de aço e concreto. [Effect of
confinement on short composite columns of steel and
concrete]. Master’s Dissertation. FEC-UNICAMP.
São Paulo.
[04] KODUR, V.K.R. Performance-based fire resistance
design of concrete-filled steel columns. Journal of
Constructional Steel Research 51 (1999) 21-36.
[05] ARAÚJO, C.J.R.V. (2008). Estudo experimental do
efeito do fogo em pilares mistos curtos de aço e
concreto. [Experimental study of the effect of fire on
composite columns of steel and concrete]. Master’s
Dissertation. FEC-UNICAMP. São Paulo.
[06] HAN, L.N. et al. Compressive and flexural behaviour
of concrete filled steel tubes after exposure to
standard fire. Journal of Constructional Steel
Research 61 (2005) 882-901.
[07] EUROPEAN COMMITTEE FOR STANDARDIZATION
(CEN). Eurocode 4: Design of composite steel and
concrete structures – part 1.2: General rules –
Structural fire design. prEN 1994-1-2. CEN: Brussels,
2005.
[08] EUROPEAN COMMITTEE FOR STANDARDIZATION.
Eurocode 4: Design of composite steel and concrete
structures - part 1-1: General rules and rules for
buildings. prEN 1994-1-1 CEN: Brussels, 2001.
Figure 20 – Temperatures achieved in the steel, at the interface and in the concrete
core for all of the models