Fuzzy Reasoning for Earthquake Damage Assessment of Large-Scale City Gas Systems

by Tsuneo Katayama, Univ of Tokyo, Tokyo, Japan,
Fumio Yamazaki, Univ of Tokyo, Tokyo, Japan,
Shigeru Nagata, Univ of Tokyo, Tokyo, Japan,
Ryoji Isoyama, Univ of Tokyo, Tokyo, Japan,

Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering


A method for earthquake damage assessment is proposed for a large-scale city gas system. Since lifeline systems are usually laid in a large area and are composed of a number of component structures, it is very difficult to forecast where and to what extent failures occur. An earthquake monitoring system and the damage estimation procedure are proposed based on the online information during the post-earthquake period. Because service shutoff of a large city gas system is known to give significant effects to the society, decisions should be made with a great care. A fuzzy reasoning is employed for damage estimation because of a large amount of uncertainty involved in it. An example calculation demonstrates some difference between the results from the fuzzy reasoning and the deterministic approach, illustrating the usefulness of fuzzy reasoning for this kind of problems.

Subject Headings: Fuzzy logic | Earthquakes | Lifeline systems | Gas pipelines | Urban areas | Urban and regional development | System analysis

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