International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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A Study of Reliability of Predictive Models for Permanent Deformation and Fatigue Failure Related to Flexible Pavement Design

연성포장설계의 소성변형과 피로파괴 예측모델에 대한 신뢰성 연구

  • Kim, Dowan (The Road Pavement Research Division, No.43, Seoul National University of Science and Technology) ;
  • Han, Beomsoo (The Road Pavement Research Division, No.43, Seoul National University of Science and Technology) ;
  • Kim, Yeonjoo (The Road Pavement Research Division, No.43, Seoul National University of Science and Technology) ;
  • Mun, Sungho (The Road Pavement Research Division, No.43, Seoul National University of Science and Technology)
  • 김도완 (서울과학기술대학교 건설시스템공학과) ;
  • 한범수 (서울과학기술대학교 건설시스템공학과) ;
  • 김연주 (서울과학기술대학교 건설시스템공학과) ;
  • 문성호 (서울과학기술대학교 건설시스템공학과)
  • Received : 2014.11.13
  • Accepted : 2014.11.28
  • Published : 2014.12.18
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Abstract

PURPOSES: The objective of this paper is to select the confidential intervals by utilizing the second moment reliability index(Hasofer and Lind; 1974) related to the number of load applications to failure which explains the fatigue failure and rut depth that it indicates the permanent deformation. By using Finite Element Method (FEM) Program, we can easily confirm the rut depth and number of load repetitions without Pavement Design Procedures for generally designing pavement depths. METHODS : In this study, the predictive models for the rut depth and the number of load repetitions to fatigue failure were used for determining the second moment reliability index (${\beta}$). From the case study results using KICTPAVE, the results of the rut depth and the number of load repetitions to fatigue failure were deducted by calculating the empirical predictive equations. Also, the confidential intervals for rut depth and number of load repetitions were selected from the results of the predictive models. To determine the second moment reliability index, the spreadsheet method using Excel's Solver was used. RESULTS : From the case studies about pavement conditions, the results of stress, displacement and strain were different with depth conditions of layers and layer properties. In the clay soil conditions, the values of strain and stresses in the directly loaded sections are relatively greater than other conditions. It indicates that the second moment reliability index is small and confidential intervals for rut depth and the number of load applications are narrow when we apply the clay soil conditions comparing to the applications of other soil conditions. CONCLUSIONS : According to the results of the second moment reliability index and the confidential intervals, the minimum and maximum values of reliability index indicate approximately 1.79 at Case 9 and 2.19 at Case 22. The broadest widths of confidential intervals for rut depth and the number of load repetitions are respectively occurred in Case 9 and Case 7.

Keywords

References

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