An Expert System for Diagnosis of Earthquake Proof for Underground Lifelines

by Shiro Takada, Kobe Univ, Kobe, Japan,
J. S. Sun, Kobe Univ, Kobe, Japan,
Yasuo Ogawa, Kobe Univ, Kobe, Japan,
Shojiro Oka, Kobe Univ, Kobe, Japan,



Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering

Abstract: This paper reports a fuzzy expert system for the diagnosis of earthquake proof of gas pipelines with the aid of OPS83 tool. The fuzzy theory was employed to estimate seismic risk on the base rock, ground response and pipeline responses which were obtained by jointing the OPS tool with ERAUL (Earthquake Response Analysis of Underground Lifelines) computer program written by FORTRAN. The ERAUL developed by authors can analyse three dimensional behaviour of buried pipelines under seismic inputs such as wave propagation, ground settlement and crack in soft soil deposits, and buoyancy, settlement and lateral flow by liquefaction. Further, database related with gas buried pipes was created including pipe materials, size, strength and joint characteristics. Following interfaces convenient for users were introduced: (a) Digitizer can be used for obtaining input data about locations of pipeline network system, (b) Documents on input data, analytical procedure and results of diagnosis can be automatically created, and (c) Graphic display is easy to use about input and output data such as pipeline system, fuzzy membership functions and results of diagnosis. For an example study, middle pressure gas pipelines were diagnosed by the developed expert computer system with pipe configurations such as straight, bend, tee, valve and reducers buried in the ground of possible liquefaction and settlements.

Subject Headings: Gas pipelines | Buried pipes | Soil settlement | Expert systems | Diagnosis | Pipe materials | Soil liquefaction | Pipe networks

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