Computers and Concrete

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Modelling of strains in reinforced concrete flexural members using alpha-stable distribution

  • Rao, K. Balaji (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani) ;
  • Anoop, M.B. (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani) ;
  • Kesavan, K. (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani) ;
  • Balasubramanian, S.R. (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani) ;
  • Ravisankar, K. (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani) ;
  • Iyer, Nagesh R. (CSIR-Structural Engineering Research Centre, CSIR Campus Taramani)
  • Received : 2011.12.28
  • Accepted : 2012.10.29
  • Published : 2013.05.01
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Abstract

Large fluctuations in surface strain at the level of steel are expected in reinforced concrete flexural members at a given stage of loading due to the emergent structure (emergence of new crack patterns). This has been identified in developing deterministic constitutive models for finite element applications in Ibrahimbegovic et al. (2010). The aim of this paper is to identify a suitable probability distribution for describing the large deviations at far from equilibrium points due to emergent structures, based on phenomenological, thermodynamic and statistical considerations. Motivated by the investigations reported by Prigogine (1978) and Rubi (2008), distributions with heavy tails (namely, alpha-stable distributions) are proposed for modeling the variations in strain in reinforced concrete flexural members to account for the large fluctuations. The applicability of alpha-stable distributions at or in the neighborhood of far from equilibrium points is examined based on the results obtained from carefully planned experimental investigations, on seven reinforced concrete flexural members. It is found that alpha-stable distribution performs better than normal distribution for modeling the observed surface strains in reinforced concrete flexural members at these points.

Keywords

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