Decomposition in optimum structural design

Decomposition in optimum structural design

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iii!iiiiiiiiiiiiiiiiiiiii!ii!iiiiiiiiiii!iiiiiiiiii!ii!iiii!iiiiiiii!iii Howell, G C and Doyle, W S 'Dynamic programming and direct iteration for the optimum design of skeletal towers' Comput. 5truct. Vol 9 (1978) pp 6 2 1 - 6 2 7 A computer technique is proposed for a simple practical method of automatically designing tower structures. Dynamic programming is used to find the optimum geometric configuration of the structural members, while the member sizes are proportioned by direct iteration. Jones, M V 'The documentation and checking of computer-aided engineering computations' Comput. Struct. Vol 10 Nos 1/2 (April 1979) pp 8 1 - 8 4 The increasing use of computers in engineering analysis and design leads to special considerations in the documentation of the computation and the procedures to be adopted in checking. This paper gives the background to, and reasons behind the publication of Recommended Standard for Documentation and Checking of Computer Aided Engineering Computations, brought out by the Association for CAD. Kirch, U and Moses, F 'Decomposition in optimum structural design' J. 5truct. Div. ASCE Vol 105 No ST 1 (January 1979) pp 8 5 - 1 0 0 Since conventional mathematical program-

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ruing techniques are most efficient in finding the optimal solution to structural design problems with a limited number of variables and constraints, a technique proposed in this paper involves decomposition of the total optimization into smaller subproblems. Each portion is solved independently at a first level and then coordinated at another level. It is claimed that the advantages of this approach are a major reduction in total computation, better convergence characteristics during the optimization and possibly, use of different specialized optimization techniques for portions of the total problem. Krishnamoorthy, C S and Mosi, D R 'A survey on optimal design of civil engineering structural systems' Eng. Optimization Vol 4 No 2 (1979) pp 7 3 - 8 8 This paper attempts to synthesize the work carried out in the field of optimization in civil engineering structural design. The paper broadly classifies the various types of structural systems and suitable grouping is done within this framework. Promising optimization methods, approximation concepts and strategies are identified. Levey, G E and Fu, K C 'A method in discrete frame optimization and its outlook' Comput. Struct. Vql 10 Nos 1/2 (April 1979) pp 3 6 3 - 3 6 8

Rigid frame design is formulated as a discrete optimization problem using minimum weight as the criterion. A technique called complex-simplex method is proposed as the method of solution. Published examples are used to test the parameters of the fnethod. Future projections and research directions m this subject area are discussed. Rozvany, G I N, and Hill, R D 'A computer algorithm for deriving analytically and plotting optimal structural layout' Comput. Struct. Vol 10 Nos 1/2 (April 1979) pp 2 9 5 - 3 0 0 The optimal alyout theory for least weight grillages is reviewed and then a computer algorithm for deriving analytically and plotting optimal layout is described. Finally, some current work on optimal archigrids is reviewed. Swanson, J A 'Present trends in computerized structural analysis' Comput. Struct. Vol 10 Nos 1/2 (April 1979) pp 3 3 - 3 7 This paper reviews the present state-of-the-art in computerized structural analysis. It looks at trends in analysis, projects them over the next 3 - 5 years and tries to predict the forms which computerized structural analysis will take.

Collated by Hari Murthy, University of Sydney, Australia

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