Mechanistic-empirical design of fibre reinforced concrete (FRC) pavements using inelastic analysis

Abstract

Use of fibre reinforced concrete (FRC) for pavements is advocated since the higher crack resistance could lead to lower slab thickness and higher joint spacing. The post-cracking capacity of FRC allows pavements to be designed and analysed considering the response beyond the elastic regime. The current paper presents possible failure patterns in FRC pavement slabs, which are governed by the slab dimensions, loading type and boundary conditions, and the appropriateness of inelastic design methodologies for these failure patterns. Subsequently, a mechanistic-empirical design methodology developed for FRC pavements, based on yield line analysis incorporating fatigue in the moment calculation, is discussed. The proposed design methodology gives specific checks for the different failure patterns and the consequent design strategy to be adopted. The method incorporates material parameters, such as the first crack and post crack flexural strengths, and fatigue correction factors for the evaluation of the moment carrying capacity. Cumulative fatigue damage analysis is also done as a serviceability check. The final design solution satisfies both the inelastic moment capacity requirement and fatigue life required without excessive damage accumulation.

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Acknowledgements

The partial financial support extended to the first author through grant SR/WOS-A/ET-1007/2015 (G), Women Scientist Scheme A of the Ministry of Science & Technology, Govt. of India, for conducting this study is gratefully appreciated.

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Correspondence to S K NAYAR.

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NAYAR, S.K., GETTU, R. Mechanistic-empirical design of fibre reinforced concrete (FRC) pavements using inelastic analysis. Sādhanā 45, 19 (2020). https://doi.org/10.1007/s12046-019-1255-1

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Keywords

  • Fibre reinforced concrete
  • rigid pavement
  • fatigue
  • yield line analysis
  • equivalent flexural strength