Total Optimization of Truss Considering Shape, Material and Sizing Variables

by Sadaji Ohkubo, Ehime Univ, Japan,
Tuyoshi Nakajima, Ehime Univ, Japan,
Kazuhiro Asai, Ehime Univ, Japan,

Document Type: Proceeding Paper

Part of: Computer Utilization in Structural Engineering


A total optimum design method is developed for truss structures in which the shape of the structure, discrete material kinds and cross-sectional areas of member elements are optimized simultaneously. The primal design problem is formulated in terms of the shape, material and sizing design variables and approximated to a sequence of conservative, convex and separable subproblems by using mixed direct/reciprocal design variables. Each subproblem is solved by dual method in which 2-stage minimization process is developed to optimize the continuous and discrete variables by using Newton-type algorithm and discrete sensitivity analysis. The design method is applied to the minimum cost design problems a subject to stress and displacement constraints and the reliability and efficiency of the proposed method are demonstrated.

Subject Headings: Trusses | Optimization models | Structural analysis | Structural design | Material properties | Sensitivity analysis | Structural reliability | Construction materials

Services: Buy this book/Buy this article


Return to search