Abstract: In order to obtain the identification method of airship composite keel structure, according to building block approach for composite structure, with the consideration of the structural feature of airship truss keel, the certification way and detailed procedures of structure design and strength verification of the keel of airship truss composite are presented in this paper. By using this method, the structure strength of composite materials truss keel of a certain type of airship is tested and verified from element level to component level to full size keel, and the finite element analysis and its results are compared and analyzed. Some typical tests and analyses are selected and introduced. The results show that the Nastran finite element analysis model of truss composite structure meets the engineering needs. Airship truss composite keel can be verified by building block method.

Key words: composite materials, building block approach, airship, truss, keel