Minimum weight design of truss structures with discrete plate thickness is studied. Constraints are referred to Standard Specifications for Highway Bridges of Japan Road Association. Whole optimization procedure is divided into two parts. One is structural level optimization, where the sectional areas and the coordinates of the nodal points are design variables. Another one is sectional level optimization of each member. This sectional level optimization is formulated as the maximum load design. This formulation makes it very easy to treat the plate thickness as discrete values. The procedures to get the solution of sectional level optimization of three kinds of sectional shape are presented for both continuous and discrete variables. They are square box section, H-shape section and stiffened square box section. As numerical example, 31-members continuous truss is designed by the proposed method and the practicality of the proposed method is shown.
板厚を離散変数とするトラス構造物の最小重量設計に関する研究
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