Selection of a structural system is an early stage in the design process during which a considerable number of different structural schemes are formulated and assessed. This paper introduces an interactive knowledge-based expert system for selection of appropriate structural systems for a particular function to meet proposed criteria. The principles, methodology and implementation of the system are described. The system will be of particular use in the choice of the most effective structural solution for large span structures. However, it could be developed for selection of appropriate structural systems for any function and proposed requirements. The architectural demand and structural requirements of large span structures are explained. Knowledge-based expert systems, object-oriented developments and applications of expert systems in structural design are investigated. Related approaches and some of the recent developed expert systems in this area are described and discussed. Finally, the approach adopted in the developed system and potential applications of the research are presented.

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