Development and application of new system reliability analysis methods for complex infrastructure systems

Kang, Won Hee

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https://hdl.handle.net/2142/24028 Copy

Description

Title

Development and application of new system reliability analysis methods for complex infrastructure systems

Author(s)

Kang, Won Hee

Issue Date

2011-05-25T15:00:33Z

Director of Research (if dissertation) or Advisor (if thesis)

Song, Junho

Doctoral Committee Chair(s)

Song, Junho

Committee Member(s)

• Wen, Y.K.
• Spencer, Billie F., Jr.
• Ha, Christopher

Department of Study

Civil & Environmental Eng

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Bayesian method
• Bridge network
• Complex system
• Connectivity analysis
• Cut-set system
• Finite element reliability analysis
• First order reliability method
• Fragility Curve
• Importance measure
• Link-set system
• Matrix-based computations
• Multivariate normal integral
• Parallel system
• Progressive failure
• Reliability bounds
• Second order reliability method
• Sensitivity
• Series system
• System reliability

Abstract

The failure event of a structure or lifeline network is often described by a complex logical function of multiple component failure events. Despite significant advances in theories on reliability analysis of individual components and their adoption in practice, the critical knowledge and quantitative methods for reliability assessments of complex system events remain elusive, leading to unknown accuracies in the risk assessment. Such a system reliability analysis is computationally challenging, especially when the definition of the system event is complex, the system has a large number of components, or the component events have significant statistical dependence due to common source effects. To overcome these challenges, this study develops two system reliability analysis methods, termed the Matrix-based System Reliability (MSR) Method and the Sequential Compounding Method (SCM), and applies the methods to risk assessment of complex structural systems and lifeline networks. Unlike existing system reliability analysis methods, the MSR method is applicable to any general system events, and can estimate not only system reliability but also component importance measures and parameter sensitivities of system reliability, which are essential metrics for risk-informed decision-making processes. The MSR method is applied to a bridge transportation network, a highway bridge structural system, and truss structures. The method is further developed to achieve improved efficiency using the first- or second-order reliability method; and to evaluate the sensitivity of the system failure probability with respect to parameters that affect the statistical dependence between the components. These further developments are demonstrated by risk assessment of progressive failures of a generalized Daniels system structure and by finite element system reliability analysis of a bridge pylon system. This study also aims at developing new methods for stochastic damage detection of pipeline networks based on the MSR method. The methods allow for efficient uncertainty quantification of system quantities such as network flow measures and for updating the component damage probabilities based on post-disaster observations on network performance. The accuracy and efficiency of these methods are demonstrated by a water pipeline network with 15 pipes that is subjected to an earthquake event. The sequential compounding method (SCM) is also developed to compute the probability of a general system event described in terms of a multivariate normal distribution. The merit of the SCM is its superior efficiency compared to existing system reliability methods including the MSR method. The accuracy and efficiency of the SCM is tested by a wide range of numerical examples including large systems consisting of 1,000 components. Due to its wide applicability, accuracy and efficiency, the method is expected to enhance the computational capability in various applications of system reliability analysis.

Graduation Semester

2011-05

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http://hdl.handle.net/2142/24028

Copyright and License Information

Copyright 2011 Won Hee Kang

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