Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Fast Dynamic Reliability Estimation Approach of Seismically Excited SDOF Structure

지진하중을 받는 단자유도 구조물의 신속한 동적 신뢰성 추정 방법

  • Lee, Do-Geun (Department of Civil, Safety and Environmental Engineering, Hankyong National University) ;
  • Ok, Seung-Yong (School of Social Safety System Engineering & Construction Engineering Research Institute, Hankyong National University)
  • 이도근 (한경대학교 토목안전환경공학과) ;
  • 옥승용 (한경대학교 사회안전시스템공학부)
  • Received : 2020.08.21
  • Accepted : 2020.09.25
  • Published : 2020.10.31
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Abstract

This study proposes a fast estimation method of dynamic reliability indices or failure probability for SDOF structure subjected to earthquake excitations. The proposed estimation method attempts to derive coefficient function for correcting dynamic effects from static reliability analysis in order to estimate the dynamic reliability analysis results. For this purpose, a total of 60 cases of structures with various characteristics of natural frequency and damping ratio under various allowable limits were taken into account, and various types of approximation coefficient functions were considered as potential candidate models for dynamic effect correction. Each reliability index was computed by directly performing static and dynamic reliability analyses for the given 60 cases, and nonlinear curve fittings for potential candidate models were performed from the computed reliability index data. Then, the optimal estimation model was determined by evaluating the accuracy of the dynamic reliability analysis results estimated from each candidate model. Additional static and dynamic reliability analyses were performed for new models with different characteristics of natural frequency, damping ratio and allowable limit. From these results, the accuracy and numerical efficiency of the optimal estimation model were compared with the dynamic reliability analysis results. As a result, it was confirmed that the proposed model can be a very efficient tool of the dynamic reliability estimation for seismically excited SDOF structure since it can provide very fast and accurate reliability analysis results.

Keywords

References

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