This paper presents a scheme for practical truss optimization in which Layered GA, a modification of Genetic Algorithm (GA) GA, is employed as the optimization method and FEM (finite element method) is utilized as the main structure calculator. Formulation to this problem adopts total weight as objective function and allowable stress, maximum nodal displacement, member crossing and member interference at joint as constraints.Design variables adopted are truss topology, cross section and nodal coordinate. Standardized cross sections are only available. Finally, the scheme is testified by some illustrative examples including cantilever truss and roof truss. A great reduction in structure mass has been found during evolution history of GA, and optimal trusses obtained are considerable simple and light in the final generation, which proves the availability and reliability of presented scheme in real truss optimization.
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