A Modification to HL-RF Method for Computation of Structural Reliability Index in Problems with Skew-distributed Variables

  • Mohsen A. Shayanfar
  • Mohammad A. Barkhordari
  • Mohammad A. Roudak
Structural Engineering
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Abstract

The Hasofer-Lind and Rackwitz-Fiessler (HL-RF) method in reliability analysis is a popular iterative method for obtaining the reliability index. However, in the cases of limit state functions with skew-distributed variables, HL-RF method may give inappropriate answers. This paper represents a modification to HL-RF method in order to improve its performance in such problems. Based on this modification, non-normal distributions are replaced with equivalent skew-normal distributions instead of equivalent normal distributions. By this modification, asymmetric non-normal distributions are not replaced with symmetric distributions anymore. It is demonstrated that this consideration of skewness of non-normal distributions improves the behavior of HL-RF method and makes the proposed method more reliable. This improvement is shown through illustrative examples.

Keywords

limit state function reliability index probability of failure HL-RF method skew-normal distribution 
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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Mohsen A. Shayanfar
    • 1
  • Mohammad A. Barkhordari
    • 2
  • Mohammad A. Roudak
    • 2
  1. 1.The Centre of Excellence for Fundamental Studies in Structural EngineeringNarmak, TehranIran
  2. 2.School of Civil EngineeringIran University of Science and TechnologyNarmak, TehranIran

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