Investigation of Rehabilitation Effects on Fire Damaged High Strength Concrete Beams
When high strength reinforced concrete is exposed to
high temperature due to a fire, deteriorations occur such as loss in
strength and elastic modulus, cracking and spalling of the concrete.
Therefore, it is important to understand risk of structural safety in
building structures by studying structural behaviors and rehabilitation
of fire damaged high strength concrete structures. This paper aims at
investigating rehabilitation effect on fire damaged high strength
concrete beams using experimental and analytical methods. In the
experiments, flexural specimens with high strength concrete are
exposed to high temperatures according to ISO 834 standard time
temperature curve. From four-point loading test, results show that
maximum loads of the rehabilitated beams are similar to or higher than
those of the non-fire damaged RC beam. In addition, structural
analyses are performed using ABAQUS 6.10-3 with same conditions
as experiments to provide accurate predictions on structural and
mechanical behaviors of rehabilitated RC beams. The parameters are
the fire cover thickness and strengths of repairing mortar. Analytical
results show good rehabilitation effects, when the results predicted
from the rehabilitated models are compared to structural behaviors of
the non-damaged RC beams. In this study, fire damaged high strength concrete beams are
rehabilitated using polymeric cement mortar. The predictions from the
finite element (FE) models show good agreements with the
experimental results and the modeling approaches can be used to
investigate applicability of various rehabilitation methods for further
study.
[1] E.G.Choi, “Performance assessment of high strength concrete members
subjected to fire”, Ph.D. thesis, Ewha Womans University, South Korea.
[2] T.Z.Harmathy, Fire Safety Design and Concrete, Scientific & Technical,
1993
[3] Kodur, B.K.R., and Sultan, M.A., “Effect of temperature on thermal
properties of high-strength concrete”, J. of Materials in Civil Engineering,
vol.15, no.2, pp. 101-107, 2003
[4] Cheng, F., Kodur, V.K.R., and Wang, T., “Stress-strain curves for high
strength concrete at elevated temperature.” J. of Materials in Civil
Engineering, vol.16, no.1, pp.84-90, 2004
[5] M.K.Shin, “Structural behaviors of fire-damaged reinforced concrete
beams with high strength”, Master’s thesis, Ewha Womans University,
South Korea.
[6] Haj-Ali RM, Choi J, Kim HS, “Integrated fire dynamics and
thermomechanical modeling frame work for steel-concrete composite
structures.”, Steel and Composite Structures, vol.10, no.2, pp.129-149,
2010
[7] Choi J, Haj-Ali Rm, Kim HS, “Integrated fire dynamic and
thermomechanical modeling of a bridge under fire.”, Structural
Engineering and Mechanics, vol.42, no.6, pp.815-829, 2012 [8] E. G. Choi, Y. S. Shin, H. S. Kim, “Structural damage evaluation of
reinforced concrete beams exposed to high temperatures.”, Journal of Fire
Protection Engineering, vol.23, no.2, pp.135-151, 2013
[9] Lamont, S., Usmani, A.S., Drysdale, D.D., “Heat transfer analysis of the
composite slab in Cardington frame fire tests.”, Fire Safety Journal,
vol.36, pp.815-839, 2001
[10] C.S Poon, S. Azhar, M. Ason, Y.L. Wong, “Strength and durability
recovery of fire-damaged concrete after post-fire-curing”, Cement and
Concrete research, vol.31, pp.1307-1318, Sep.2001
[11] Henderson, J. B., Wiebelt, J. A., and Tant, M. A., “A model for the
thermal response of polymer composite materials with experimental
verification.”, J. of Composite Materials, vol.19, pp.579--595, 1985
[1] E.G.Choi, “Performance assessment of high strength concrete members
subjected to fire”, Ph.D. thesis, Ewha Womans University, South Korea.
[2] T.Z.Harmathy, Fire Safety Design and Concrete, Scientific & Technical,
1993
[3] Kodur, B.K.R., and Sultan, M.A., “Effect of temperature on thermal
properties of high-strength concrete”, J. of Materials in Civil Engineering,
vol.15, no.2, pp. 101-107, 2003
[4] Cheng, F., Kodur, V.K.R., and Wang, T., “Stress-strain curves for high
strength concrete at elevated temperature.” J. of Materials in Civil
Engineering, vol.16, no.1, pp.84-90, 2004
[5] M.K.Shin, “Structural behaviors of fire-damaged reinforced concrete
beams with high strength”, Master’s thesis, Ewha Womans University,
South Korea.
[6] Haj-Ali RM, Choi J, Kim HS, “Integrated fire dynamics and
thermomechanical modeling frame work for steel-concrete composite
structures.”, Steel and Composite Structures, vol.10, no.2, pp.129-149,
2010
[7] Choi J, Haj-Ali Rm, Kim HS, “Integrated fire dynamic and
thermomechanical modeling of a bridge under fire.”, Structural
Engineering and Mechanics, vol.42, no.6, pp.815-829, 2012 [8] E. G. Choi, Y. S. Shin, H. S. Kim, “Structural damage evaluation of
reinforced concrete beams exposed to high temperatures.”, Journal of Fire
Protection Engineering, vol.23, no.2, pp.135-151, 2013
[9] Lamont, S., Usmani, A.S., Drysdale, D.D., “Heat transfer analysis of the
composite slab in Cardington frame fire tests.”, Fire Safety Journal,
vol.36, pp.815-839, 2001
[10] C.S Poon, S. Azhar, M. Ason, Y.L. Wong, “Strength and durability
recovery of fire-damaged concrete after post-fire-curing”, Cement and
Concrete research, vol.31, pp.1307-1318, Sep.2001
[11] Henderson, J. B., Wiebelt, J. A., and Tant, M. A., “A model for the
thermal response of polymer composite materials with experimental
verification.”, J. of Composite Materials, vol.19, pp.579--595, 1985
@article{"International Journal of Architectural, Civil and Construction Sciences:70909", author = "Eun Mi Ryu and Ah Young An and Ji Yeon Kang and Yeong Soo Shin and Hee Sun Kim", title = "Investigation of Rehabilitation Effects on Fire Damaged High Strength Concrete Beams", abstract = "When high strength reinforced concrete is exposed to
high temperature due to a fire, deteriorations occur such as loss in
strength and elastic modulus, cracking and spalling of the concrete.
Therefore, it is important to understand risk of structural safety in
building structures by studying structural behaviors and rehabilitation
of fire damaged high strength concrete structures. This paper aims at
investigating rehabilitation effect on fire damaged high strength
concrete beams using experimental and analytical methods. In the
experiments, flexural specimens with high strength concrete are
exposed to high temperatures according to ISO 834 standard time
temperature curve. From four-point loading test, results show that
maximum loads of the rehabilitated beams are similar to or higher than
those of the non-fire damaged RC beam. In addition, structural
analyses are performed using ABAQUS 6.10-3 with same conditions
as experiments to provide accurate predictions on structural and
mechanical behaviors of rehabilitated RC beams. The parameters are
the fire cover thickness and strengths of repairing mortar. Analytical
results show good rehabilitation effects, when the results predicted
from the rehabilitated models are compared to structural behaviors of
the non-damaged RC beams. In this study, fire damaged high strength concrete beams are
rehabilitated using polymeric cement mortar. The predictions from the
finite element (FE) models show good agreements with the
experimental results and the modeling approaches can be used to
investigate applicability of various rehabilitation methods for further
study.", keywords = "Fire, High strength concrete, Rehabilitation,
Reinforced concrete beam.", volume = "9", number = "7", pages = "898-7", }