An improved design method to predict the E-modulus and strength of FRP composites at different temperatures

  • Mohammed FaruqiEmail author
  • Gobishanker Rajaskanthan
  • Breanna Bailey
  • Francisco Aguiniga
Research Article


In recent years, there has been an increased interest in the use of fiber reinforced polymer (FRP) in the construction industry. However, the E-modulus and strength of such members at high service temperatures is still unknown. Modulus and strength of FRP at high service temperatures are highly required parameters for full design. The knowledge and application of this could lead to a cost effective and practical consideration in fire safety design. Thus, this paper proposes design methods for calculating the E-modulus and strength of FRP members at different temperatures. Experimental data from literature were normalized and compared with the results predicted by this method. It was found that the proposed design methods conservatively estimate the E-modulus and strength of FRP structural members. In addition, comparison was also made with direct references to the real behavior of materials. It was found to be satisfactory. Finally, an application is provided.


concrete fiber reinforced polymer E-modulus strength temperatures 



material fitting constant


material fitting constant


material fitting constant


E-modulus corresponds to glassy state


E-modulus corresponds to rubbery state


E-modulus corresponds to decomposed state


E-modulus at ambient temperature


E-modulus glassy state


initial E-modulus


residual E-modulus


E-modulus at evaluated temperature


material dependent constant


Weibull exponent


empirical constant


Weibull moduli corresponding to bond breakage


Weibull moduli corresponding to bond breakage


Weibull moduli corresponding to bond breakage


power low index


initial strength


residual strength


strength at evaluated temperature


power modification factor


scaling function


temperature correspondent to glassy state


temperature correspondent to rubbery state


temperature correspondent to decomposed state


evaluating temperature


temperature where experimental curve is symmetric


initial temperature


experimental fitting parameters


residual temperature


glass transition temperature


degree of decomposed state


normalized E-modulus


degree of glassy state


normalized strength


degree of rubbery state


normalized temperature

Δm (T)

mass loss at time T


mass loss at end


minimum strength


strength at glassy state


strength at leathery state


strength at decomposed state


strength at rubbery state


strength at ambient temperature


strength at evaluated temperature.


experimental fitting constant


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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Mohammed Faruqi
    • 1
    Email author
  • Gobishanker Rajaskanthan
    • 1
  • Breanna Bailey
    • 1
  • Francisco Aguiniga
    • 1
  1. 1.Department of Civil and Architectural EngineeringTexas A&M UniversityKingsvilleUSA

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