Abstract
A displacement-based optimization strategy is extended to the design of truss structures with geometric and material nonlinear responses. Unlike the traditional optimization approach that uses iterative finite element analyses to determine the structural response as the sizing variables are varied by the optimizer, the proposed method searches for an optimal solution by using the displacement degrees of freedom as design variables. Hence, the method is composed of two levels: an outer level problem where the optimal displacement field is searched using general nonlinear programming algorithms, and an inner problem where a set of optimal cross-sectional dimensions are computed for a given displacement field. For truss structures, the inner problem is a linear programming problem in terms of the sizing variables regardless of the nature of the governing equilibrium equations, which can be linear or nonlinear in displacements. The method has been applied to three test examples, which include material and geometric nonlinearities, for which it appears to be efficient and robust.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received December 4, 2000
Rights and permissions
About this article
Cite this article
Missoum, S., Gürdal, Z. & Gu, W. Optimization of nonlinear trusses using a displacement-based approach. Struct Multidisc Optim 23, 214–221 (2002). https://doi.org/10.1007/s00158-002-0179-1
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00158-002-0179-1