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- 저자 : Flavio Avila Correia Martins (검색결과 1 건)
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Flavio Avila Correia Martins,Juan Pablo Julca Avila,Marcelo Araujo da Silva 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
The implementation of a new linear method to optimum weight design of trussed structures subjected to external and selfweight loads is proposed. Design variables are the cross-section areas of the members. Inequality constraints are written based on the force-method for isostatic structures considering maximum and minimum axial stress criteria. The novelty of the proposed approach is the benefi t created from the combination of a linear inequality-constrained formulation with interior-point methods to tunnel the solution rapidly and monotonically towards the minimum value through feasible space, also eliminating the need to directly explore the fi nite-element model. To evaluate the performance of the algorithm, trusses are subject to optimization processes based on diff erent techniques: (i) the proposed method, called by “indirect-method”; (ii) a design problem with constraint evaluated directly from the fi nite-element model; (iii) optimization based on Genetic Algorithms. The three methods are compared using trusses with 10, 37 and 1240 bar-elements. The results showed that the indirect-method was able to provide great performance for complex topologies, returning weight designs up to 70 times lighter in 1% of the time required by a Genetic Algorithm.
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