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Uncertainty and dependence analysis of performance limit state for structural multidimensional fragility evaluation

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Considering uncertainty and dependence of performance limit states (PLSs), the study addresses a methodology to evaluate multidimensional fragility. The purpose is to identify the PLS uncertainty quantitatively. The dependence between each PLS parameters is also investigated. The limit state band is firstly proposed to describe the bi-dimensional case. Through interval estimation, the band area with a certain confidence level is determined. A reinforcement concrete bridge is used as example to illustrate the proposed approach for developing fragility curves. PLS threshold samples are obtained to formulate limit state function using incremental dynamic analysis. The study investigates the sensitivity of the method for fragility assessment when different confidence levels are considered. In addition, influence of correlation coefficient between PLSs is evaluated. Results show that a fragility interval is obtained with the introduction of limit state band. The interval length decreases as with the reduction of the confidence level. The probability of failure becomes smaller when the dependence between PLSs is ignored, which will result in overestimation of the structural seismic performance.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou 221116, Jiangsu, China

    Qi’ang Wang

  2. China University of Mining and Technology, School of Mechanics and Civil Engineering, Xuzhou 221116, Jiangsu, China

    Qi’ang Wang

  3. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an, 710129, China

    Ziyan Wu & Lu Liu

Authors
  1. Qi’ang Wang
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  2. Ziyan Wu
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  3. Lu Liu
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Correspondence to Qi’ang Wang.

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Wang, Q., Wu, Z. & Liu, L. Uncertainty and dependence analysis of performance limit state for structural multidimensional fragility evaluation. KSCE J Civ Eng 21, 1386–1392 (2017). https://doi.org/10.1007/s12205-016-0983-6

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  • DOI: https://doi.org/10.1007/s12205-016-0983-6

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