Thermal Cracking Respone of Reinforced Concrete Beam to Gradient Temperature

In this paper are illustrated the principal aspects connected with the numerical evaluation of thermal stress induced by high gradient temperature in the concrete beam. The reinforced concrete beam has many advantages over steel beam, such as high resistance to high temperature, high resistance to thermal shock, Better resistance to fatigue and buckling, strong resistance against, fire, explosion, etc. The main drawback of the reinforced concrete beam is its poor resistance to tensile stresses. In order to investigate the thermal induced tensile stresses, a numerical model of a transient thermal analysis is presented for the evaluation of thermo-mechanical response of concrete beam to the high temperature, taking into account the temperature dependence of the thermo physical properties of the concrete like thermal conductivity and specific heat.

Authors:

• L. Dahmani
• M.Kouane

Keywords:

• Cracking
• Gradient Temperature
• Reinforced Concrete beam
• Thermo-mechanical analysis.

References:

[1] Alfaiate, J.; Pires, E.B.; Martins, J.A.C.," A Finite Element Analysis of
Non-Prescribed Crack propagation in Concrete". Computers &
Structures, Vol. 63, No. 1, 1997, pp. 17-26.
[2] "ANSYS Theory Reference: Analysis tools", 001099, 9th ed. SAS IP,
Inc.
[3] ANSYS Thermal Analysis: Tutorial for Rev. 5.0, DN-T031:50, 6., 1992.
[4] Dahmani, L., "Thermo mechanical response of LNG concrete tank to
cryogenic temperatures", Strength of Materials, Vol. 43, No. 5, 2011, pp.
526-53.
[5] Dahmani, L., Khennane, A., Kaci,S. , "Crack identification in reinforced
concrete beams using ANSYS software " , Strength of Material Journal,
Ed. Springer New York , Vol.42,N┬░2, Mai 2010, pp. 232-240.
[6] Dahmani, L., Khennane, A., Kaci,S. , « Behavior of the reinforced
concrete at cryogenic temperature », Cryogenics , Volume 47, Issues 9-
10, September-October 2007, Pages 517-525.
[7] DeBorst, R.; "Some Recent Developments in Computational Modeling
of Concrete Fracture". International Journal of Fracture, No. 86, No. 1-
2, 1997, pp. 5-36.
[8] Loo, Y.C.; Guan, H., "Cracking and Punching Shear Failure Analysis of
RC Flat Plates". ASCE Journal of Structural Engineering, Vol. 123, No.
10, 1997, pp. 1321-1330.
[9] Ngo, D. and Scordelis, A.C., "Finite Element Analysis of Reinforced-
Concrete Beams". Journal of the American Concrete Institute, Vol. 65,
No. 9, 1967, pp.757-766.
[10] Moaveni, S., "Finite Element Analysis: Theory and Application with
ANSYS", Pearson Education Inc., 2003, New Jersey.
[11] William, K.J. and Warnke, E.P., "Constitutive Model for the Triaxial
Behavior of Concrete". Proceedings of the International Association for
Bridge and Structural Engineering, Vol. 19, ISMES, Bergamo, Italy,
1975, pp. 174.