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This paper describes an expert system for selecting the types of superstructures and substructures of river-crossing bridges, and deals with the knowledge of expert designers and rules of Japanese codes as the knowledge base. This expert system can automatically determine span arrangements satisfying the River-Crossing Structure Law, and uses the fuzzy set theory for pile type selection to express the ambiguous knowledge of expert designers. Moreover, in this system, the online data communication system between workstation and host computer is utilized for more accurate evaluation of substructure construction costs.

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