NONLINEAR FINITE ELEMENT ANALYSIS OF INSULATED FRP STRENGTHENED REINFORCED CONCRETE COLUMNS SUBJECTED TO FIRE

Authors

  • Osama El-Mahdy Department of Civil Engineering, Faculty of Engineering at Shoubra, Benha University, Shoubra, Cairo, Egypt
  • Gehan Hamdy Department of Civil Engineering, Faculty of Engineering at Shoubra, Benha University, Shoubra, Cairo, Egypt
  • Mohamed Hisham

DOI:

https://doi.org/10.14311/CEJ.2018.02.0016

Keywords:

Numerical modelling, RC columns, FRP, Elevated temperature, Thermal insulation

Abstract

In recent decades, Fiber Reinforced Polymers (FRP) have shown tremendous potential for retrofitting or repairing existing deficient or damaged concrete structural elements due to their superior properties such as high strength, corrosion resistance and ease of application. However, concern arises about the vulnerability of FRP material to combustion under fire condition, since they are usually applied to the exterior surface of structural members. Damage of the FRP strengthening layer due to high temperature is likely to decrease the load carrying capacity of the columns and threaten the safety of the structure. This paper presents numerical investigation of the behaviour of reinforced concrete (RC) columns strengthened with FRP sheets and insulated by a thermal resisting coating under service load and fire conditions. The finite element numerical modelling and nonlinear analysis are made using the nonlinear finite element analysis software ANSYS 12.1 [1]. The numerical model is verified for several FRP confined and insulated RC columns that have been experimentally tested under service load and standard fire tests in the published literature. The obtained numerical results are in good agreement with the experimental ones regarding the temperature distribution and axial deformation response. Consequently, the presented modelling gives an economic tool to investigate the behaviour of loaded FRP strengthened RC columns under high temperatures occurring in case of fire, if the modelling is verified against experimental works. Furthermore, the model can be used to design thermal protection layers for FRP strengthened RC columns to fulfill fire resistance requirements specified in building codes and standards.

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References

ANSYS–Release Version 12.1.0, “A Finite Element Computer Software and User Manual for Nonlinear Structural Analysis”, ANSYS Inc. Canonsburg, PA., (2009).

Chowdhury,E.U., “Behavior of Fiber Reinforced Polymer Confined Reinforced Concrete Columns Under Fire Condition.”, PhD thesis, Dept. of Civil Engineering Queen’s Univ., Kingston, Ont., Canada, (2009).

Youssef, M. N., Feng, M. Q.and Mosallam, A. S., “Stress-Strain Model for Concrete Confined by FRP Composites”, Composites Part B, V. 38, pp. 614-628, (2007).

Bisby, L. A., “Fire Behavior of FRP Reinforced or Confined Concrete.”, PhD thesis, Dept. of Civil Engineering Queen’s Univ., Kingston, Ont., Canada, (2003).

Chowdhury,E.U., Bisby, L.A. and Green, M.F., "Investigation of Insulated FRP-Wrapped Reinforced Concrete Columns in Fire”, Fire Safety Journal, 42 (2007),pp. 452–460.

Cree, C., Chowdhury,E.U., Bisby, L.A., Green, M.F., and Benichou, N., “Performance in Fire of FRP-Strengthened and Insulated Reinforced Concrete Columns”, Fire Safety Journal, 54 (2012), pp. 86–95.

ASTM, "Standard Test Methods for Fire Tests of Building Construction and Materials", ASTM Standard E119, American Society for Testing of Materials, West Conshohocken, PA, (2002).

Bisby, L.A., Green, M.F.and Kodur, V.K.R., “Modeling the Behavior of Fiber Reinforced Polymer-Confined Concrete Columns Exposed to Fire”, 10.1061/(ASCE)1090-0268(2005)9:1(15).

Eurocode2, “Design of Concrete Structures, ENV EC2 Part 1.2",Eurocode, (2004).

Eurocode 3, “Design of Steel Structures, ENV EC3 Part 1.2.",Eurocode, (2005).

Griffis, C., Masmura, R. and Chang, C., "Thermal Response of Graphite Epoxy Composite Subjected to Rapid Heating", Environmental Effects on Composite Materials, Vol. 2, pp. 245- 260, (1984).

Williams, B, Kodur,V, Green, M. and Bisby, L., "Fire Endurance of Fiber-Reinforced Polymer Strengthened Concrete T-Beams,", J ACI Structural, vol. 105, No. 1, pp. 60-67, (2008).

Torelli, G., Mandal, P., Gillie, M. and ,Tran, V.X., "Concrete Strains under Transient Thermal Conditions: A State-of-The-Art Review", Engineering Structures 127, pp. 172–188, (2016).

Anderberg, Y. and Thelandersson, S., “Stress and Deformation Characteristics of Concrete at High Temperature: 2. Experimental Investigation and Material Behavior Model”, Bull. No. 46, Lund,(1976).

Park, S. H., Manzello, S., L., Bentz, D., P., and Mizukami, T., “Determining Thermal Properties of Gypsum Board at ElevatedTemperatures”, Fire and Materials, (2009), pp. 237-250.

Cramer, S.M., Friday, O.M., White, R.H., and Sriprutkiat, G., “Mechanical Properties of Gypsum Board at Elevated Temperatures”, Fire and Materials (2003) 33–42.

Lie, T. T., and Kodur, V. K. R., "Thermal Properties of Fibre Reinforced Concrete at Elevated Temperatures", National Research Council Canada, Institute for Research in Construction), 04-01, (1995).

Masoud, A.Z., “Structural and Thermal Behaviour of Insulated FRP Strengthened Reinforced Concrete Beams and Slabs in Fire”, PhD Thesis, Dept. of Civil Engineering Queen’s Univ., Kingston, Ont., Canada, (2013).

Lee, J.Y., Oh, Y.J., Park, J., S.and Mansour, M.Y., "Behavior of Concrete Columns Confined with Both Spiral and Fiber Composites", 13th World Conference on Earthquake Engineering, No. 3051, (2004).

Hawileh, R., A., Naser, M., Zaidan, W., and Rasheed, H. A., “Modeling of Insulated CFRPStrengthened Reinforced Concrete T-beam Exposed to Fire”, Engineering Structures, 31( 12) (2009), pp. 3072–3079.

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Published

2018-07-31

How to Cite

El-Mahdy, O., Hamdy, G., & Hisham, M. (2018). NONLINEAR FINITE ELEMENT ANALYSIS OF INSULATED FRP STRENGTHENED REINFORCED CONCRETE COLUMNS SUBJECTED TO FIRE. Stavební Obzor - Civil Engineering Journal, 27(2). https://doi.org/10.14311/CEJ.2018.02.0016

Issue

Vol. 27 No. 2 (2018)

Section

Articles

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