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

  • 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.

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Authors and Affiliations

  1. The Centre of Excellence for Fundamental Studies in Structural Engineering, Narmak, Tehran, 16846, Iran

    Mohsen A. Shayanfar

  2. School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, 16846, Iran

    Mohammad A. Barkhordari & Mohammad A. Roudak

Authors
  1. Mohsen A. Shayanfar
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  2. Mohammad A. Barkhordari
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  3. Mohammad A. Roudak
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Correspondence to Mohsen A. Shayanfar.

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Shayanfar, M.A., Barkhordari, M.A. & Roudak, M.A. A Modification to HL-RF Method for Computation of Structural Reliability Index in Problems with Skew-distributed Variables. KSCE J Civ Eng 22, 2899–2905 (2018). https://doi.org/10.1007/s12205-017-1473-1

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