FLOW-BASED RELIABILITY ASSESSMENT OF INFRASTRUCTURE SYSTEMS
The Reliability assessment of lifelines subjected to external hazards is critical to protect the functionality and quality of utility services in contemporaneous society. This paper introduces two performance metrics to assess service reliability of systems. Service Reduction (SR), and Weighted Service Reduction (WSR) are proposed to study the potential of networked systems to meet required demands when they are subjected to external events such as earthquake hazards. These metrics provide flow-based reliability estimates of network performance that go beyond traditional connectivity-based system reliability methods. Using Monte Carlo simulation and ??ow optimization algorithms, probabilistic fragility curves for a practical networked system in Memphis, Tennessee, USA are generated. Comparison of trends in the predicted behavior of the testbed system under connectivity and ??ow-based functionality performance measures highlight the adequacy of the new metrics to capture quality of service at the customer level. In fact, results from WSR reveal that it is possible to maintain adequate levels of service for higher levels of seismic intensity if a targeted ??ow assignment strategy is implemented. The proposed fragility curves of infrastructure systems service reduction can be used for decision making processes involving pre-disaster maintenance activities and post-event interventions. Flow- based fragility curves can also be employed as tools for the assessment of retro?$tting actions by comparing network reliability predictions before and after the implementation of strategic topological and structural enhancements.
System fragility Service reduction Earthquake hazard Simulation Optimization.
Leonardo Due(n)as-Osorio Isaac Hernandez-Fajardo
Assistant Professor,Department of Civil and Environmental Engineering, Rice University, Houston, TX. Doctoral student,Department of Civil and Environmental Engineering, Rice University, Houston, TX. US
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）